The Setscrew, cataloged under National Stock Number 5305-01-052-3713, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Long-Lok, Llc. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-052-3713 |
| Primary Part Number | LL51021-31 |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Long-Lok, Llc |
| Status | ACTIVE |
| Width Across Flats | 1.984 MILLIMETERS NOMINAL MM |
| Fastener Length | 4.763 MILLIMETERS NOMINAL MM |
| Thread Length | 3.175 MILLIMETERS NOMINAL MM |
| Thread Class | 3A A |
| 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 |
|---|---|
| 5800765-9001-027 | Hensoldt Sensors Gmbh (DEU) |
| LL51021-31 PRIMARY | Long-Lok, Llc (USA) |
| LL57XD82J3 | Long-Lok, Llc (USA) |
| Reference | Meaning |
|---|---|
| 810138 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-052-3713 is a Setscrew, manufactured by Long-Lok, Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-052-3713 has 3 manufacturer part numbers on file: 5800765-9001-027 (Hensoldt Sensors Gmbh), LL51021-31 (Long-Lok, Llc), LL57XD82J3 (Long-Lok, Llc).
Key specifications for LL51021-31: Width Across Flats: 1.984 MILLIMETERS NOMINAL MM; Fastener Length: 4.763 MILLIMETERS NOMINAL MM; Thread Length: 3.175 MILLIMETERS NOMINAL MM; Thread Class: 3A A. 4 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.