The Stud,locked in, cataloged under National Stock Number 5307-00-905-5532, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. The manufacturer of record is Triumph Engine Control Systems Llc. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5307-00-905-5532 |
| Primary Part Number | 81599-1 |
| Item Name | Stud,locked in |
| FSC / FSG | 5307 / 53 — Studs |
| Manufacturer | Triumph Engine Control Systems Llc |
| Status | ACTIVE |
| Thread Length | 0.562 INCHES NOMINAL NUT THREAD IN |
| Thread Length | 0.355 INCHES NOMINAL STUD THREAD IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| Style Designator | LOCKED IN |
| Material Document and Classification | AMS 5613 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND STUD THREAD |
| Thread Direction | RIGHT-HAND NUT THREAD |
| Nominal Thread Size | 0.250 INCHES NUT THREAD IN |
| Nominal Thread Size | 0.312 INCHES STUD THREAD IN |
| Shoulder Diameter | 0.241 INCHES NOMINAL IN |
| Locking Feature | RING, LOCK KEYED |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A NUT THREAD A |
| Thread Class | 3A STUD THREAD A |
| Distance From Shoulder Portion to Nut End | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Thread Quantity Per Inch | 18 STUD THREAD |
| Thread Quantity Per Inch | 28 NUT THREAD |
| Material | STEEL COMP 410 |
| Shoulder Length | 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN |
| Thread Series Designator | UNF NUT THREAD |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) STUD THREAD |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 81599-1 PRIMARY | Triumph Engine Control Systems Llc (USA) |
NSN 5307-00-905-5532 is a Stud,locked in, manufactured by Triumph Engine Control Systems Llc, classified under FSC 5307, Studs. Status: active.
NSN 5307-00-905-5532 has 1 manufacturer part number on file: 81599-1 (Triumph Engine Control Systems Llc).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-331-3099. Verify interchangeability with system specifications before substitution.
Key specifications for 81599-1: Thread Length: 0.562 INCHES NOMINAL NUT THREAD IN; Thread Length: 0.355 INCHES NOMINAL STUD THREAD IN; Hardness Rating: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM; Style Designator: LOCKED IN. 21 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.