You know what you need. These guides help you spec it right. Every page is a technical reference — bolt sizing, spec identification, traceability documentation, and hardware pairings. Each one links directly to the matching parts we stock with FAA 8130-3 traceability included. No filler. Just the information you need to order confidently.
Complete grip length reference for every AN bolt diameter. How to measure, common mistakes, and a full table cross-linking each dash number to in-stock parts.
Head markings, material differences, tensile strength comparison. Know which spec you're holding before you order a replacement.
What the airworthiness approval tag is, who can issue it, how to read it, and what "new surplus with 8130-3" means for legal installation.
Master table: diameter, thread, grip lengths, and typical applications for every AN bolt size we stock.
AN310 vs AN320, which cotter pin size matches, torque-and-back-off procedure, and FAA AC 43.13 references.
When surplus is fine. When it isn't. What "new surplus" actually means, how 8130-3 protects the mechanic, and a real cost comparison.
Why three standards exist, when each applies, and the substitution rules that keep your signoff clean. Includes FAA AC 43.13-1B references.
Dry and lubricated torque values from FAA AC 43.13-1B Table 7-1. Castle nut torque-and-advance procedure, calibration notes, and technique.
Five material families, their strength ratings, temperature limits, and which zones they belong in. Material selection is a design decision, not an upgrade.
AMS QQ-P-416, AMS 2700, MIL-A-8625 spec comparisons. Salt-spray ratings, galvanic compatibility, and hydrogen embrittlement risk explained.
Why aerospace uses Class 3A/3B only, the difference between UNF and UNJF root profiles, and the MIL-S-8879 (SAE AS8879) requirement for NAS hardware.
When to use drilled shank vs drilled head bolts, how to install castle nuts per AC 43.13-1B, safety wire direction rules, and locking method selection.
FAA traceability hierarchy — 8130-3, CoC, MTR — and how certified surplus is legally identical to new. Includes 30–60% cost advantage breakdown.