The Bolt,machine, cataloged under National Stock Number 5306-00-022-1981, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Army Weapons Command Attn Amswe-Ree-S. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5306-00-022-1981 |
| Primary Part Number | 221981 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Army Weapons Command Attn Amswe-Ree-S |
| Status | ACTIVE |
| Head Height | 0.312 INCHES NOMINAL IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Thread Length | 1.125 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-633 FS FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.125 INCHES NOMINAL IN |
| Width Between Flats | 0.750 INCHES NOMINAL IN |
| Locking Feature | DISTORTIONS BEARING SURFACE OF HEAD |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 1035 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 221981 | Army Weapons Command Attn Amswe-Ree-S (USA) |
| Reference | Meaning |
|---|---|
| 221981 | 3/9 Design control — primary reference General Motors Corp |
| 221981 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 5306-00-022-1981 is a Bolt,machine, manufactured by Army Weapons Command Attn Amswe-Ree-S, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-022-1981 has 1 manufacturer part number on file: 221981 (Army Weapons Command Attn Amswe-Ree-S).
1 possible match (shared part number, not a government interchangeability claim): 2920-01-205-6018. Verify interchangeability with system specifications before substitution.
Key specifications for 221981: Head Height: 0.312 INCHES NOMINAL IN; Fastener Length: 1.250 INCHES NOMINAL IN; Thread Length: 1.125 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-633 FS FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 16 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.