# Tight Tolerance Parts: A Specification Guide for Assembly

> Precision Advanced Manufacturing delivers integration-ready tight tolerance parts built for first-try assembly. Explore our specification guide.

**Published:** 2026-08-18 | **Updated:** 2026-10-22 | **Author:** precision
**URL:** https://precisionam.com/articles/precision-machining/integration-ready-tight-tolerance-parts/
**Type:** post

**Categories:** Precision Machining

![Tight Tolerance Parts: A Specification Guide for Assembly](https://blog.precisionam.com/wp-content/uploads/sites/56/2026/08/1786785649587-36a7eb87e05a-1024x572.webp)

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## Content

*Last updated: October 21, 2026*

## Key Takeaways

- Integration-ready tight-tolerance parts account for tolerance allocation across the entire mating stack, including every contributing feature.
- GD&T datum schemes mirror assembly fixturing so parts that pass inspection also assemble correctly on the line.
- Material stability, thermal effects and finishing processes such as anodizing enter the tolerance stack to prevent post-machining dimensional shifts.
- Inspection methods and documentation align with the datum scheme and include AS9102 first-article reports with full traceability.
- Precision Advanced Manufacturing delivers integration-ready parts through multi-axis CNC machining, AS9100D and ITAR-compliant quality systems and integrated finishing and hardware installation.

[Share a Tight-Tolerance Project with Precision Advanced Manufacturing](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=integration-ready-tight-tolerance-parts)

## Defining Integration-Ready Tight-Tolerance Parts

Integration-ready tight-tolerance parts are components machined to specified tolerances, datum schemes and finishing requirements so they assemble directly with mating parts. These parts reach the line without shimming, hand-fitting or rework. A conforming part satisfies its individual drawing limits. An integration-ready part also accounts for how those limits interact with every other part in the stack, how the datum scheme mirrors assembly fixturing and whether finishing and hardware are complete before the part reaches assembly.

![A machined metal part fixtured inside a CNC machining center.](https://cdn.aigrowthmarketer.co/1785163886671-8f5217244f88.webp)**Mission-critical components leave no room for deviation. Multi-axis CNC machining holds tight tolerances part after part, with full material traceability behind every feature.**

Integration readiness is an allocation problem. The measure is how well tolerance is distributed across the mating stack so the assembly, not just the individual component, meets specification. [Tight-tolerance CNC machining decisions](https://precisionam.com/articles/tight-tolerance-cnc-machining/?utm_source=ai-growht-agent&utm_term=integration-ready-tight-tolerance-parts) begin with clear knowledge of where precision matters in the functional chain.

## Tolerance Stack-Up Analysis Across the Mating Stack

A [tolerance stack-up](https://blog.texocad.ai/glossary/statistical-tolerance-analysis) analyzes how dimensional and geometric variation combines to affect a functional assembly result such as a gap, fit, alignment or preload. The analysis follows the dimensions and locating relationships that control that result. The goal is to distribute tolerance across contributors so the assembly closes within its functional limits.

Two primary methods apply. Worst-case analysis adds each contributor at its allowable limit in the unfavorable direction, [producing minimum and maximum assembly results](https://turn2engineering.com/mechanical-engineering/mechanical-design/tolerance-stack-up-analysis) when the tolerance model is correct. It suits designs that require interchangeability, hard assembly limits, high consequence of failure or low production volume. Statistical (RSS) analysis combines contributors by root-sum-of-squares, producing a probabilistic estimate. [RSS is valid only when each dimension is independent, roughly normally distributed and centered on its nominal, and the drawing tolerance equals ±3σ](https://precimach.com/tolerance-stack-up-analysis.html). Those conditions require confirmation.

A worked example shows allocation in practice. Consider a three-part mating stack: a housing depth, a spacer and a cover offset, with a minimum-gap requirement of 0.25 mm. With a nominal gap of 0.50 mm and worst-case half-range of 0.23 mm, [the worst-case minimum gap is 0.27 mm, only 0.02 mm above the requirement](https://turn2engineering.com/mechanical-engineering/mechanical-design/tolerance-stack-up-analysis). The housing depth dominates the stack and consumes the largest share of worst-case variation. That feature deserves the tighter tolerance. The cover offset contributes the smallest share and can remain at standard machining tolerance without threatening the assembly outcome.

Over-tolerancing is a real cost driver. [Tight tolerances should be applied only where they matter](https://baetrocnc.com/industries/aerospace) because precision spent away from the functional gap raises cost and lead time without improving integration. Tolerance budget should be allocated where it is economical to hold and where it directly controls the functional gap.

## Datum Schemes That Match Assembly Fixturing

A GD&T datum scheme for mating parts should mirror how the part is seated and located in final assembly. [A mismatch between the drawing datum and the assembly interface forces inspection, machining and supplier quality teams to work from different coordinate systems](https://metricmech.com/articles/datum-feature-selection-rules-gdt). That mismatch produces parts that pass CMM checks yet fail in assembly.

The method follows three steps. First, identify the primary assembly interface, the surface the part seats against its mating component first and over the largest area. That surface becomes Datum A and constrains three degrees of freedom. Second, identify the secondary locating feature such as a hole pattern, dowel, machined edge or pilot that mirrors the actual assembly locator. That becomes Datum B and constrains two more degrees of freedom. Third, identify the tertiary anti-rotation feature such as a single hole, slot or edge as Datum C to remove the remaining rotational freedom.

[Datum letters in a feature control frame are read left to right as primary, secondary and tertiary](https://isocnc.com/resources/gdt-datums). Reversing the sequence changes the measurement reference hierarchy and produces different inspection results on the same part. The same surfaces should drive design, machining, inspection and assembly so that tolerance accumulation follows the real functional stack.

In the earlier stack-up example, the housing depth dominates the stack. The datum scheme must ensure that feature is machined and inspected from the same reference used in assembly. If the inspection datum differs from the assembly datum, the stack-up calculation becomes mathematically correct but physically irrelevant.

## GD&T Controls for Critical Mating Features

Once the datum scheme is set, the next decision is which geometric controls to apply to the mating features. [ASME Y14.5-2018](https://asme.org) establishes the rules, definitions and symbols for those controls. For mating features, three control types carry the most weight.

Position with Maximum Material Condition (MMC) is the recommended specification for clearance hole patterns in bolted joints. [Available positional tolerance increases as the hole grows above minimum size](https://mechanicalengineeringprojects.net/engineering-tolerances-and-gdt-the-complete-practical-guide-for-mechanical-engineers). That behavior reflects assembly function and enables straightforward functional-gauge inspection. Form and orientation controls such as flatness on seating faces and perpendicularity between datum faces should be applied to the datum features to ensure stable, repeatable contact. Profile of a surface controls complex geometry where form and location must be held together relative to the datum scheme.

![A five-axis CNC head machining a round metal workpiece.](https://cdn.aigrowthmarketer.co/1785163943949-293d9b0cce58.webp)**Five-axis machining reaches complex geometries in a single setup — fewer fixtures, tighter true position, and the repeatability aerospace and defense programs demand.**

Each control must trace back to the datum scheme and the stack allocation. A geometric tolerance that does not connect to a functional gap or mating interface adds inspection burden without improving integration readiness.

## Material and Process Stability in Tight Tolerance Work

A correct drawing still depends on the part holding its dimensions after machining. Thermal expansion, residual stress and material selection can erode tight tolerances once the part leaves the machine. [A 10-inch aluminum part can shift a measured dimension by roughly 0.0026 inches across a 20°F temperature swing](https://zhenlingmetal.com/blog/aerospace-cnc-machining-guide) between a shop floor and a climate-controlled inspection room. That shift explains why precision inspection environments are commonly held near the [ISO 1 reference temperature of 20°C](https://trupartprecision.com/blog/cmm-inspection-fai-first-article-cnc-parts).

Residual stress from aggressive roughing passes can cause parts to spring back after unclamping, particularly in thin-wall or asymmetric geometries. [A rough, stabilize, recheck and finish sequence](https://zhenlingmetal.com/blog/aerospace-cnc-machining-guide) manages this risk. The process removes most material, allows the part to relax, verifies geometry, then applies final finishing passes. Titanium and Inconel present additional challenges. [Titanium’s low thermal conductivity concentrates cutting heat at the tool-workpiece interface](https://nicerapidtooling.com/resources/cnc-machining-for-aerospace-parts-tolerances-and-process-controls), which drives rapid tool wear and thermal expansion that threatens dimensional accuracy.

Coatings and platings act as links in the tolerance stack. [A hard-anodized bearing bore that returns undersized illustrates a fit quietly changed by a coating](https://precimach.com/tolerance-stack-up-analysis.html). Coating thickness must be included in the stack model before parts are made. Specifying finishing requirements at the drawing stage forms part of integration readiness.

## Inspection as the Integration-Readiness Gate

Inspection is a gate that confirms the part will assemble. The method must match the tolerance and the datum scheme. [Modern CMMs achieve measurement uncertainty in the low micrometre range in temperature-controlled environments](https://trupartprecision.com/blog/cmm-inspection-fai-first-article-cnc-parts) and support complex geometry, true position, profile and any GD&T control that hand tools cannot reliably capture. Optical comparators suit 2D profiles and small features. Gauge pins support rapid go/no-go checks in volume production but do not replace CMM inspection for datum-referenced position or complex geometry.

![A CMM touch probe measuring a machined aluminum bracket.](https://cdn.aigrowthmarketer.co/1785164194032-a09872ce26c4.webp)**Every critical dimension is verified — CMM inspection and controlled quality workflows produce first-article and in-process data you can trace to each part.**

In-process checks tied to the datum scheme catch dimensional drift before an entire batch is produced. [Mature suppliers use Statistical Process Control to sample critical dimensions and monitor process capability](https://tikprecision.com/blog/cnc-machining-quality-control-from-first-article-inspection-to-full-dimensional-reports.html). They set tool life alarms and perform first-piece, mid-batch and last-piece sampling on continuous runs.

Documentation a supplier should provide includes inspection reports with measured values against every drawing characteristic, material certifications with heat and lot traceability and first-article documentation per [AS9102](https://machiningtechllc.com/what-is-machined-part-validation-for-engineers). An AS9102 First Article Inspection Report structures accountability into three forms. Part number accountability confirms configuration. Product accountability covers material and special process records. Characteristic accountability records the measured value, nominal, tolerance and pass or fail result for every drawing characteristic. A certificate of conformance without underlying measurement data does not serve as a complete inspection record. For more on inspection standards, see [tight-tolerance inspection for aerospace and defense](https://precisionam.com/articles/tight-tolerance-inspection-aerospace/?utm_source=ai-growht-agent&utm_term=integration-ready-tight-tolerance-parts).

[Send a Drawing Package for Inspection Review](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=integration-ready-tight-tolerance-parts)

## Integration-Readiness Checklist for Finishing, Hardware and Kitting

Parts that pass dimensional inspection still need five downstream steps before they are line-ready. Each step should be specified on the drawing and verified with the supplier.

1. **Secondary finishing.** Anodizing, passivation and plating affect final dimensions and must be included in the tolerance stack. Specifying finish requirements upfront prevents late-program surprises and keeps the delivered interface aligned with design intent.
2. **Hardware installation.** PEM-style nuts, studs, standoffs and pins installed by the supplier remove a secondary operation at the assembly line. Hardware should be specified by type, size and location on the drawing.
3. **Deburring.** Burrs on machined or cut edges affect part performance, datum seating and assembly fit. Deburring should be specified and verified.
4. **Laser marking.** Part identification, serial numbers and revision levels applied by laser engraving support traceability through assembly and service life. Marking requirements should be called out on the drawing.
5. **Kitting.** Consolidating components into organized kits reduces handling, removes assembly-line sorting and lowers the risk of missing or misidentified parts. Kitting requirements should be defined in the purchase order.

Each of these steps decides whether a part goes straight to assembly or waits for secondary work, which is why integration delays usually trace back to one of them being left off the drawing.

![Machined metal flanges arranged after finishing and deburring.](https://cdn.aigrowthmarketer.co/1785164177118-60d8e0c39169.webp)**Finishing and deburring are where tolerance becomes function — clean edges, controlled surface finish, and coatings applied and documented to specification.**

## Five-Step Specification Process for Integration-Ready Parts

1. **Define assembly fit requirements.** Start with the functional output such as minimum clearance, maximum interference, allowable misalignment or preload. Write the gap on the assembly drawing first, then work back to part tolerances. Every tolerance decision should trace to a functional requirement.
2. **Allocate tolerance across the stack.** Perform a worst-case or RSS stack-up, depending on production volume and consequence of failure. Identify the dominant contributor and assign tighter tolerance there. Leave standard machining tolerance on features that do not drive the functional gap.
3. **Establish a datum scheme tied to fixturing.** Select primary, secondary and tertiary datums from assembly constraints, the surfaces the part seats against in use. Map those datums to fixturing and inspection setups so machining, inspection and assembly all reference the same coordinate system.
4. **Select GD&T controls for mating features.** Apply position at MMC for clearance hole patterns, form and orientation controls to datum features and profile for complex mating surfaces. Each control should connect to the datum scheme and the stack allocation.
5. **Specify inspection and documentation.** Define the inspection method for each critical characteristic, require in-process checks tied to the datum scheme and specify AS9102 first-article documentation, material certifications and traceability records as deliverables.

## Supplier Criteria for Integration-Ready Tight-Tolerance Programs

The earlier sections define what integration readiness requires. Qualifying a supplier means confirming it can deliver each of those requirements through its quality system and manufacturing process. Concrete criteria include AS9100D and ISO 9001:2015 registrations, ITAR registration for defense and space programs, inspection documentation and material traceability, multi-axis CNC and Swiss machining capability, engineering support for manufacturability, integrated finishing and hardware installation and scalable production from prototype through full-rate manufacturing.

Precision Advanced Manufacturing meets each of these criteria. The company holds AS9100D and ISO 9001:2015 registrations and is ITAR registered, operating under quality systems designed for regulated, mission-critical industries. That discipline carries into the shop floor through multi-axis CNC milling and turning, Swiss-type machining and capability in titanium and Inconel for complex, high-tolerance components across aerospace, defense, space, UAV and advanced industrial programs. In-house engineering and CNC programming support manufacturability review from the outset, which reduces the risk of tolerance specifications that are correct on paper but difficult to hold in production. Precision Advanced Manufacturing offers integrated finishing and kitting capabilities and operates two facilities in Anaheim, California, and Texas to reduce handoffs between suppliers.

![A commercial airliner in flight against a blue sky.](https://cdn.aigrowthmarketer.co/1785164215115-cf050b902241.webp)**Aerospace manufacturing for flight-critical hardware — machined and fabricated to AS9100D with the traceability and repeatability commercial airframe programs depend on.**

Shops that offer machining only require customers to manage separate finishing, hardware and kitting suppliers. Each handoff introduces a coordination point where dimensional changes from finishing can go unverified, traceability can break and schedule risk accumulates. Integrated capabilities reduce those handoffs. Certified quality systems provide traceability from raw material to finished kit. A scalable production platform supports prototype-to-production transitions without supplier changes. For a detailed look at machining standards, see [tight-tolerance machining standards explained](https://precisionam.com/articles/tight-tolerance-machining-standards/?utm_source=ai-growht-agent&utm_term=integration-ready-tight-tolerance-parts).

## Conclusion and Next Steps

Integration readiness centers on one decision made before drawing release. Allocate tolerance where the assembly needs it, then machine, inspect and finish to that same reference. Each element becomes a specification choice at design time rather than a correction at the assembly line.

Precision Advanced Manufacturing combines multi-axis CNC machining, AS9100D and ITAR-compliant quality systems and full traceability with integrated finishing and hardware installation to deliver parts that fit on the first try.

Next steps include reviewing drawing packages against the five-step specification process and the integration-readiness checklist, requesting inspection documentation and material certifications from current suppliers and engaging Precision Advanced Manufacturing for a quote-based project evaluation.

[Plan a Prototype or Production Run with Precision Advanced Manufacturing](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=integration-ready-tight-tolerance-parts)

## Frequently Asked Questions

### What Is the Standard Tolerance for Machining?

[Standard CNC machining typically holds tolerances in the range of ±0.005 in](https://zhenlingmetal.com/blog/aerospace-cnc-machining-guide) for general, non-critical features. Precision machining for functional-fit features such as bearing bores, register diameters and mating interfaces operates in a tighter range. Flight-critical and sealing features in aerospace applications can require significantly tighter tolerances. The appropriate tolerance for any feature depends on its role in the assembly, the material being machined and the inspection method available to verify it. Over-tolerancing is a real cost driver, which is why the stack-up should decide where precision is spent.

### What Is Tolerance and Clearance?

Tolerance is the total permissible variation in a dimension, the difference between the maximum and minimum acceptable values for a feature. Clearance is the intentional gap between mating parts that allows assembly, motion or thermal expansion without interference. In a mating stack, clearance is the functional output that tolerance allocation must protect. A tolerance stack-up analysis distributes the permitted variation across all contributing features so the worst-case or statistical assembly result still provides the required minimum clearance. [Clearance fits, transition fits and interference fits each have defined tolerance grade systems under ISO 286](https://mechanicalengineeringprojects.net/engineering-tolerances-and-gdt-the-complete-practical-guide-for-mechanical-engineers) that specify the relationship between hole and shaft tolerances for standard mating conditions.

### How Do Parts Fit Together Without Hand-Fitting?

The earlier sections cover the mechanics. In short, hand-fitting disappears when tolerance allocation, datum selection and finishing are all decided before drawing release. A tolerance stack-up performed before drawing release, combined with a datum scheme that matches how the part is seated in assembly, removes the conditions that create hand-fitting at the line.

### What Documentation Should a Supplier Provide to Prove Integration Readiness?

A supplier qualified for integration-ready tight-tolerance parts should provide a First Article Inspection Report structured per AS9102, with measured values for every drawing characteristic, the inspection method used and a pass or fail result for each. Material certifications with heat and lot traceability should accompany every order. Special process records for heat treatment, anodizing, passivation, plating or other finishing operations should document that the process met the specified standard. A certificate of conformance signed by a delegated quality authority closes out the package. For serialized or safety-critical parts, records should be retained for the life of the program. As noted earlier, a certificate of conformance alone does not substitute for measurement data.

### How Does Over-Tolerancing Affect Cost and Lead Time?

Over-tolerancing, specifying tighter tolerances than the assembly function requires, increases machining cost, inspection time and lead time without improving integration readiness. Tolerances tighter than the functional requirement force slower cutting parameters, additional setups and more rigorous inspection methods for features that do not drive the assembly outcome. The correct approach is to identify the dominant contributor in the tolerance stack, assign tighter tolerance there and leave standard machining tolerance on features outside the functional loop. Tolerance allocation guided by stack-up analysis typically produces lower total cost than blanket tightening across all features.

### Can Precision Advanced Manufacturing Handle Both Prototypes and Full-Rate Production?

Precision Advanced Manufacturing supports the full product lifecycle from prototype development through sustained, multi-shift production. The same certified quality systems, inspection processes and traceability requirements apply at prototype and production volumes, so the quality validated during first article carries forward into full-rate manufacturing without supplier changes. This continuity reduces program risk during production ramp and removes the re-qualification burden that comes with transitioning between a prototype shop and a production supplier.

### What Certifications Should an Integration-Ready Tight-Tolerance Parts Supplier Hold?

For aerospace, defense, space and UAV programs, the baseline certifications are AS9100D and ISO 9001:2015 quality management system registrations and ITAR registration for defense and space-related work. [AS9100D builds on ISO 9001 with aerospace-specific requirements for risk management, configuration control, product safety and supplier control](https://baetrocnc.com/industries/aerospace). [Under 22 CFR § 122.1(a), any person who engages in the United States in the business of manufacturing, exporting or temporarily importing defense articles, or furnishing defense services, is required to register with the Directorate of Defense Trade Controls (DDTC)](https://www.ecfr.gov/current/title-22/chapter-I/subchapter-M/part-122), and a manufacturer who does not engage in exporting must nevertheless register, subject to the limited exemptions in § 122.1(b). Beyond certifications, supplier qualification should assess inspection capability such as CMM capacity, calibration records and GD&T competence, documentation quality, engineering support for manufacturability, integrated finishing and hardware capability and demonstrated scalability from prototype to production volume.

## Read Next

- [Tight Tolerance Machining Standards Explained](https://precisionam.com/articles/tight-tolerance-machining-standards/)
- [Tight Tolerance Metal Components Machining](https://precisionam.com/articles/tight-tolerance-metal-components-machining/)
- [Tight Tolerance Machining Examples for Aerospace and Defense](https://precisionam.com/articles/tight-tolerance-machining-aerospace-examples/)
- [Tight Tolerance Inspection: Verifying ±0.001" and Tighter](https://precisionam.com/articles/tight-tolerance-inspection-aerospace/)
- [Tight Tolerance CNC Machining: Standards & Capabilities](https://precisionam.com/articles/tight-tolerances-cnc-machining/)

---

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    **Question:**

    - **Name:** What Is the Standard Tolerance for Machining?
      **Answer:**

      - **Text:** Standard CNC machining typically holds tolerances in the range of ±0.005 in for general, non-critical features. Precision machining for functional-fit features such as bearing bores, register diameters and mating interfaces operates in a tighter range. Flight-critical and sealing features in aerospace applications can require significantly tighter tolerances. The appropriate tolerance for any feature depends on its role in the assembly, the material being machined and the inspection method available to verify it. Over-tolerancing is a real cost driver, which is why the stack-up should decide where precision is spent.
    **Question:**

    - **Name:** What Is Tolerance and Clearance?
      **Answer:**

      - **Text:** Tolerance is the total permissible variation in a dimension, the difference between the maximum and minimum acceptable values for a feature. Clearance is the intentional gap between mating parts that allows assembly, motion or thermal expansion without interference. In a mating stack, clearance is the functional output that tolerance allocation must protect. A tolerance stack-up analysis distributes the permitted variation across all contributing features so the worst-case or statistical assembly result still provides the required minimum clearance. Clearance fits, transition fits and interference fits each have defined tolerance grade systems under ISO 286 that specify the relationship between hole and shaft tolerances for standard mating conditions.
    **Question:**

    - **Name:** How Do Parts Fit Together Without Hand-Fitting?
      **Answer:**

      - **Text:** The earlier sections cover the mechanics. In short, hand-fitting disappears when tolerance allocation, datum selection and finishing are all decided before drawing release. A tolerance stack-up performed before drawing release, combined with a datum scheme that matches how the part is seated in assembly, removes the conditions that create hand-fitting at the line.
    **Question:**

    - **Name:** What Documentation Should a Supplier Provide to Prove Integration Readiness?
      **Answer:**

      - **Text:** A supplier qualified for integration-ready tight-tolerance parts should provide a First Article Inspection Report structured per AS9102, with measured values for every drawing characteristic, the inspection method used and a pass or fail result for each. Material certifications with heat and lot traceability should accompany every order. Special process records for heat treatment, anodizing, passivation, plating or other finishing operations should document that the process met the specified standard. A certificate of conformance signed by a delegated quality authority closes out the package. For serialized or safety-critical parts, records should be retained for the life of the program. As noted earlier, a certificate of conformance alone does not substitute for measurement data.
    **Question:**

    - **Name:** How Does Over-Tolerancing Affect Cost and Lead Time?
      **Answer:**

      - **Text:** Over-tolerancing, specifying tighter tolerances than the assembly function requires, increases machining cost, inspection time and lead time without improving integration readiness. Tolerances tighter than the functional requirement force slower cutting parameters, additional setups and more rigorous inspection methods for features that do not drive the assembly outcome. The correct approach is to identify the dominant contributor in the tolerance stack, assign tighter tolerance there and leave standard machining tolerance on features outside the functional loop. Tolerance allocation guided by stack-up analysis typically produces lower total cost than blanket tightening across all features.
    **Question:**

    - **Name:** Can Precision Advanced Manufacturing Handle Both Prototypes and Full-Rate Production?
      **Answer:**

      - **Text:** Precision Advanced Manufacturing supports the full product lifecycle from prototype development through sustained, multi-shift production. The same certified quality systems, inspection processes and traceability requirements apply at prototype and production volumes, so the quality validated during first article carries forward into full-rate manufacturing without supplier changes. This continuity reduces program risk during production ramp and removes the re-qualification burden that comes with transitioning between a prototype shop and a production supplier.
    **Question:**

    - **Name:** What Certifications Should an Integration-Ready Tight-Tolerance Parts Supplier Hold?
      **Answer:**

      - **Text:** For aerospace, defense, space and UAV programs, the baseline certifications are AS9100D and ISO 9001:2015 quality management system registrations and ITAR registration for defense and space-related work. AS9100D builds on ISO 9001 with aerospace-specific requirements for risk management, configuration control, product safety and supplier control. Under 22 CFR § 122.1(a), any person who engages in the United States in the business of manufacturing, exporting or temporarily importing defense articles, or furnishing defense services, is required to register with the Directorate of Defense Trade Controls (DDTC), and a manufacturer who does not engage in exporting must nevertheless register, subject to the limited exemptions in § 122.1(b). Beyond certifications, supplier qualification should assess inspection capability such as CMM capacity, calibration records and GD&T competence, documentation quality, engineering support for manufacturability, integrated finishing and hardware capability and demonstrated scalability from prototype to production volume.

  **Article:**

  - **Headline:** Tight Tolerance Parts: A Specification Guide for Assembly
  - **Description:** Precision Advanced Manufacturing delivers integration-ready tight tolerance parts built for first-try assembly. Explore our specification guide.
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    - **Name:** Precision Advanced Manufacturing
    - **Url:** https://precisionam.com


---

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## Citations

- [Precision CNC Machining Costs: A Buyer’s Should-Cost Guide](https://precisionam.com/articles/precision-machining/precision-cnc-machining-costs-guide/)
- [Precision CNC Machining Small Batch: A Buyer’s Guide](https://precisionam.com/articles/precision-machining/precision-cnc-machining-small-batch/)
- [How To Reduce CNC Machining Scrap for Aerospace Programs](https://precisionam.com/articles/precision-machining/reduce-cnc-machining-scrap/)
- [CNC Machining Design Guidelines: DFM for Aerospace Parts](https://precisionam.com/articles/precision-machining/precision-cnc-machining-design-guidelines/)
- [ITAR Machining Tolerances Guide: What ITAR Actually Requires](https://precisionam.com/articles/precision-machining/itar-machining-tolerances-guide/)

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