How to Evaluate an Aerospace Fastener Manufacturer for NAS, MS, AN, and AS Parts

If you are sourcing NAS, MS, AN, or AS parts, the first question is how to judge the company behind them. Selecting an aerospace fastener manufacturer means checking eight areas: standards capability, certifications, materials, traceability, inspection, manufacturing accuracy, customization, and supply reliability. A part number on a quote does not by itself confirm that the hardware conforms to its standard. So, the manufacturer’s controls matter as much as the part. In this post, we will explain what to check in each area and why it matters to your program.

Verify Which Aerospace Standards the Manufacturer Supports

Start by confirming which standard families the manufacturer works to. A capable aerospace fastener manufacturer should be able to name the NAS, MS, AN, and AS documents it produces to and show the current revision of each one.

• NAS: NAS fasteners follow National Aerospace Standards, which the Aerospace Industries Association (AIA) develops and maintains.
• MS: MS fasteners come from U.S. military standards. AIA has converted more than 500 military standards into NASM or NAM documents, and you can still order those parts under the original MS part number.
• AN: AN fasteners come from the older Army-Navy system. FAA maintenance guidance still covers AN bolts such as AN3 through AN20.
• AS: AS aerospace parts follow SAE International Aerospace Standards.
• Changing requirements: Requirements can change with the part number, revision, material, dimensions, application, and customer specification. If a manufacturer checks each of these against your purchase order, then you receive the part your drawing calls for.

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Review Quality Certifications and Manufacturing Controls

Certifications show that an aerospace fastener supplier has a documented quality system in place, so confirm what each one covers.

• AS9100: 9100 is the quality management standard for aviation, space, and defense organizations. It includes the ISO 9001 requirements and adds industry-specific requirements.
• ISO 9001: This certificate covers the general quality system. So, check whether the supplier also holds AS9100 for aerospace work.
• Special-process controls: Processes such as heat treatment and plating often carry separate accreditation. Many aerospace customers ask for Nadcap.
• Inspection procedures: These should be written down, and staff should follow the same steps for every lot.
• Documented quality systems: Ask for t e certificate and check the facility address, scope, listed processes, and expiry date. If the supplier sends any process to outside vendors, then ask how it approves and monitors them.

Evaluate Material and Manufacturing Capabilities

Check whether the manufacturer can work with the materials and tolerances that precision aerospace fasteners require. These capabilities decide whether every part in a lot is consistent and suitable for its application.

• High-strength materials: Alloy steels, A286, and nickel alloys are common for structural and heat-resistant fasteners.
• Corrosion-resistant materials: Corrosion-resistant steels, titanium, and aluminum alloys suit exposed or weight-sensitive locations.
• Precision machining: Close-tolerance bolts need tightly held shank diameters, and structural bolts need the correct grip length.
• Thread accuracy: Many aerospace bolts call for UNJ threads, which SAE AS8879 defines with a controlled root radius and a Class 3A fit.
• Dimensional tolerances: Head, shank, and thread dimensions should stay within drawing limits from the first part to the last part of a lot.
• Heat treatment: Where it applies, the process must match the material specification and reach the required hardness.
• Special requirements: Ask how the manufacturer handles features such as drilled heads, self-locking elements, or special finishes.

Check Traceability and Documentation

Traceability links every fastener back to its raw material and production run. The FAA states that standards organizations do not certify or monitor AN, MS, and NAS fastener manufacturers, and that each manufacturer is responsible for conformance. AIA also states that it does not qualify suppliers. So, the buyer needs records showing the parts conform.

• Material traceability: Material test certificates should link each lot to its heat or mill batch.
• Batch or lot identification: Each package should carry a lot number which matches the shipping documents.
• Inspection records: These show the measured results against the drawing limits.
• Certificates: A certificate of conformity confirms that the lot meets the stated standard and revision.
• Process records: Heat treatment and plating certificates show that special processes were completed as specified.
• Manufacturing documentation: The drawing revision and route card used for the lot help you trace its full history if a part is questioned later.

Understand the Inspection and Quality-Control Process

Inspection confirms that each lot matches its drawing before it ships. A fastener may look correct and still differ in hardness, thread form, or coating, so ask the manufacturer to describe these controls.

• Dimensional inspection: Checks of lengths, diameters and head features against the drawing.
• Thread inspection: Checks with calibrated thread gauges for the specified fit class.
• Material verification: Chemical analysis and hardness testing to confirm the grade.
• Testing where applicable: Mechanical tests such as tensile or stress durability tests, which many standards call for under NASM1312 test methods.
• Final inspection: A last check of the lot before release.
• Documented quality checks: Recorded results give you proof of conformity, which you can keep with your own quality records.

Assess Standard and Custom Manufacturing Capabilities

Some programs need only standard catalog parts, while others need parts made to drawings or customer specifications. A manufacturer that can do both gives you one source for a wider range of needs.

• Custom dimensions: Non-standard lengths, diameters, or head sizes made to your drawing.
• Special materials: Grades which a standard part number does not list.
• Tight tolerances: Limits closer than a standard part calls for.
• Custom aerospace fasteners: Bolts, screws and nuts designed for one assembly.
• Machined components: Pins, spacers and other precision parts made alongside fasteners.
• Drawing-based manufacturing: The supplier should review your drawing before production, ask questions early, and explain how it handles first-article inspection. Aerospace fastener manufacturers that combine standards-based production with drawing-based work can support a broader range of aerospace requirements. Companies like UPS Lakshmi manufacture aerospace fasteners to NAS, MS, AN, and AS standards and also make custom fasteners and precision-machined components to customer drawings and specifications.

Consider International Supply and Communication

If your supplier is overseas, then check how it manages supply, documents, and communication across borders.

• Consistency of supply: Steady lead times help you plan production.
• Documentation: Documents should match the format your receiving inspection team expects.
• Communication: Your contact person should be able to discuss drawings and revisions promptly.
• Delivery coordination: Clear shipping schedules and tracking keep your line supplied.
• Export experience: Ask whether the manufacturer has exported aerospace parts before and how it handles export paperwork.
• Work with overseas customers: Ask how it manages time zones and technical queries.
• Specification compliance: Take a case where a drawing revision changes a finish callout. A responsive supplier confirms the change before making the next lot.

Questions to Ask Before Choosing an Aerospace Fastener Manufacturer

Use these questions as a checklist when you speak with a supplier.

• Which NAS, MS, AN, and AS standards do you manufacture to, and how do you keep revisions current?
• What quality certifications cover your facility, and what is the scope of each one?
• How do you maintain material and lot traceability from raw material to shipment?
• Can you manufacture parts from customer drawings and specifications?
• Which inspection methods and mechanical tests do you use before release?
• Which materials can you support for aerospace fasteners?
• How do you handle and approve special processes such as heat treatment and plating?

Putting the Checklist to Work

Selecting an aerospace fastener manufacturer comes down to evidence. Confirm the standards and revisions it follows, and review the scope of its certifications. Check its material and machining capabilities, traceability records, and inspection process. If your program needs drawing-based parts, then confirm its custom manufacturing capability too. Finally, look at supply consistency and communication. A supplier that can show documented proof in each of these areas is probably a sound choice for NAS, MS, AN, and AS parts.