Aircraft Hardware Sourcing & Certification Guide

Section 01

How to Read 8130-3 vs EASA Form 1

Two release certificates, one purpose: proving a part left a certified facility under an approved quality system. Here's what each one is and how to read them.

FAA Form 8130-3 — Authorized Release Certificate

The FAA Form 8130-3 is the US domestic airworthiness release document. It's issued by FAA-certificated repair stations and manufacturers operating under FAA-approved quality systems. For surplus hardware, you'll mostly see it as a new parts approval tag (Block 12 marked "NEW") from the original distributor or manufacturer's quality control.

Block 7

Organization name — who released it. Should be an FAA-certificated entity.

Block 9

Part number and description. Verify it matches the physical marking and your PO.

Block 10

Quantity. Must match what you received.

Block 11

Serial or lot/batch number. This is your traceability anchor.

Block 12

"NEW" for new parts, "OVERHAULED" / "REPAIRED" for maintained parts. For fasteners, you want NEW.

Block 14a

Certifying statement — the legal language. Read it.

Block 19

Remarks — any limitations, shelf-life notes, or conditions. Never skip this block.

EASA Form 1 — European Release Certificate

The EASA Form 1 is the European equivalent, issued under EASA Part-145 (maintenance) or Part-21 (production). It's cross-recognized with 8130-3 under bilateral agreements (EU-US BASA). For MRO operations that maintain European-registered aircraft or source from European distributors, you'll encounter Form 1s regularly.

Cross-recognition

An EASA Form 1 issued under Part-21 Production is accepted as equivalent to an 8130-3 under the EU-US Bilateral Aviation Safety Agreement. A Form 1 from a Part-145 Maintenance Organization is equivalent to an 8130-3 from an FAA repair station.

Red flag: photocopied certificates

A release cert should accompany the original shipment. If a seller provides a photocopy — especially one that's been rescanned or the lot numbers don't match the quantity you're buying — request the original. Lot splits must be documented with a trace to the original cert.

Section 02

What AN / MS / NAS Designators Mean

The three-letter prefix tells you the specification family — and who wrote it. The numbers after specify the exact geometry and material.

AN

Army-Navy Standard. Legacy designation, written by joint Army-Navy committees starting in the 1940s. Still in widespread use. AN bolts, nuts, washers, and cotter pins are the workhorses of general aviation. AN3 through AN20 cover standard hex-head bolts.

MS

Military Standard. Replaced AN specs for many applications. Covers specialty fasteners — self-locking nuts (MS21042), snap rings, fittings, and high-strength applications. MS specs are maintained by the Department of Defense.

NAS

National Aerospace Standard. Written by the Aerospace Industries Association for high-performance aerospace applications. NAS bolts typically have tighter tolerances and higher tensile strength than equivalent AN hardware. Common on transport category and experimental high-performance aircraft.

Reading a part number: AN3-10A

Decode

AN3 = AN bolt, 3/16" shank diameter
-10 = 10/8" (1.25") grip length
A = undrilled shank (no cotter pin hole); omit for drilled

AN3-10A: non-drilled 3/16" hex-head bolt, 1.25" grip. Material is cadmium-plated alloy steel unless suffix "C" (corrosion resistant) or "DD" (2024 aluminum).

Section 03

Shelf-Life Rules for Surplus Hardware

Most metallic fasteners (steel, aluminum, titanium) have no defined shelf life when stored correctly. The concern with surplus hardware isn't age — it's storage conditions and documentation continuity.

What actually has shelf life

⚠Self-locking nuts and locking inserts: Nylon insert locking nuts (e.g., MS21042 series) have manufacturer-defined shelf life — typically 10–15 years. Torque-out testing is required beyond that.
⚠Sealants and compound-treated fasteners: Any fastener with pre-applied sealant, locking compound, or wet torque coating has shelf life from the application date.
⚠Specialty elastomeric coatings: Some NAS fasteners with vibration-dampening coatings carry shelf life tied to the coating formulation.

Inspection requirements on receipt

✓Corrosion — visual and tactile. No pitting, blistering, or white oxide on aluminum, no rust on steel.
✓Thread condition — run a nut by hand. Any cross-threading, burrs, or inconsistent engagement is cause for rejection.
✓Head markings — compare physical markings to the cert and part number. Mismatched markings are a counterfeit indicator.
✓Coating integrity — cad plating should be even and intact. Bare spots on structural hardware require evaluation.

Storage standard

AC 00-56B (Voluntary Industry Distributor Accreditation) and ASME B18.18 cover hardware storage. Key requirements: controlled temperature and humidity, segregated by lot number, protected from contamination, original packaging preserved or documented when broken.

Section 04

Red Flags When Buying Surplus

The surplus market has legitimate, well-documented parts — and it has unknown-provenance hardware that can't be traced. The difference is documentation. Here's what to watch for.

✗No cert documentation: Any seller who can't provide an 8130-3, CoC, or trace document is selling you junk. "We don't have paperwork but they're definitely AN spec" is not an acceptable answer for aircraft hardware.
✗Mismatched lot quantities: The 8130-3 says 1,000 units. You're buying 50. That's a lot split — it must be documented. Ask for the split documentation showing your 50 are from that lot.
✗Altered part numbers: Physical markings that look re-stamped, inconsistent depth, or don't match the cert designation. This is a counterfeit indicator.
✗Stock in bulk bags with no lot separation: Mixed lots mean you can't trace individual units. You're buying liability.
✗Price too far below market: Certified hardware costs what it costs. If AN3-10A bolts are available for $0.02 each with "full certs," the certs aren't real.
✗Distributor can't name the OEM: Where was it manufactured? A legitimate distributor knows. "Unknown origin" is rejection criteria for any aircraft application.

Section 05

Cert-to-Serial Trace: A Sample Walkthrough

Here's what a complete trace chain looks like for a single AN bolt from surplus inventory.

1

Original manufacturer production record

Textron Fastening Systems — Lot #TFS-2019-0441 — 5,000 pcs AN3-10A — Produced 2019-07-12 under FAA Production Approval Holder (PAH) authorization. Certificate of Conformance TFS-C-2019-0441.

2

FAA 8130-3 issued

8130-3 Tag #2019-0441 issued by TFS QC. Block 11: Lot TFS-2019-0441. Block 10: 5,000. Block 12: NEW. Block 14a certifies new production to AN3-10A standard.

3

Distributor acquisition

Aviation Parts Depot acquired 500 pcs from OEM stock in 2021. Lot split documented: APD-SPLIT-2021-0088 references original Lot TFS-2019-0441 and 8130-3 #2019-0441. 500 pcs segregated in original manufacturer packaging.

4

MRO depot resale

Regional MRO acquired 200 pcs from APD in 2023, cycling out of their shelf stock. Sold with original 8130-3, CoC, and lot split documentation chain intact. Stored per AC 00-56B requirements.

5

Your hands

You receive 50 pcs with the full chain above. Every link is documented. You can trace from this bolt in your hand back to the production lot, the CoC, and the original manufacturer's quality records.

That's what legitimate surplus looks like. Every link documented. No gaps. If a seller can only give you step 4 → 5 without the prior history, you're missing the chain.

Section 06

Surplus vs. New: Pricing on Common SKUs

Price comparison against Aircraft Spruce list price (current as of 2026). Surplus price is our shelf price for identical spec, certified hardware.

Part Number	Description	New (Aircraft Spruce)	Surplus (Spec Bolt)	Savings
AN3-10A	3/16" hex bolt, 1.25" grip	$1.15	$0.72	—37%
AN3-5A	3/16" hex bolt, 0.625" grip	$0.98	$0.61	—38%
AN365-1032A	10-32 elastic stop nut	$0.54	$0.31	—43%
AN960-10	10 flat washer, narrow	$0.13	$0.08	—38%
MS20074-06-12	Structural bolt, 6-32, 3/4"	$1.89	$1.18	—38%
NAS1149C0432R	#4 flat washer, 300 series SS	$0.44	$0.27	—39%

The hardware is identical — same AN/MS/NAS spec, same certs, same trace. The price difference is channel economics. Surplus comes from MRO depot over-runs and distributor stock rotations. When an MRO needs to cycle out shelf stock, they sell at wholesale. That's the spread.

The math on a typical inspection

A 50-hour inspection on a Cessna 172 typically uses 20–40 replacement fasteners across control surface hinges, cowling, and interior panels. At 35–45% savings per fastener, that's $8–$15 off a single inspection. On a fleet of 10 aircraft doing monthly inspections, you're looking at $960–$1,800 saved annually — just on hardware.