The Washer,lock, cataloged under National Stock Number 5310-00-012-1744, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Us Army Aviation and Missile Command. Government technical data includes 9 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-012-1744 |
| Primary Part Number | 121744 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Us Army Aviation and Missile Command |
| Status | ACTIVE |
| Hardness Rating | 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Material Document and Classification | QQ-S-633,FS 1060 TO FS 1080-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.380 INCHES MAXIMUM IN |
| Material Thickness | 0.056 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | A CLASS AND 2 STYLE |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Material | STEEL COMP 1060 OR STEEL COMP 1065 OR STEEL COMP 1070 OR STEEL COMP 1075 OR STEEL COMP 1080 OVERALL |
| Hole Diameter | 0.221 INCHES MINIMUM AND 0.232 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 121744 PRIMARY | Us Army Aviation and Missile Command (USA) |
| 121744 PRIMARY | Chrysler Realty Company Llc Dba Daimler Chrysler (USA) |
| 121744 PRIMARY | Rolls-Royce Solutions America Inc (USA) |
| Reference | Meaning |
|---|---|
| 121744 | 5/9 Secondary reference General Motors Corp |
| FFW84CLASSASTYLE2 | 4/1 Identification reference U.S. Government activity |
| 85425C | 5/9 Secondary reference Brockway Motor Trucks Div of Mack Trucks Inc |
| 121744 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 5310-00-012-1744 is a Washer,lock, manufactured by Us Army Aviation and Missile Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-012-1744 has 3 manufacturer part numbers on file: 121744 (Us Army Aviation and Missile Command), 121744 (Chrysler Realty Company Llc Dba Daimler Chrysler), 121744 (Rolls-Royce Solutions America Inc).
2 possible matches (shared part number, not a government interchangeability claim): 3110-01-150-5683, 4720-01-615-1143. Verify interchangeability with system specifications before substitution.
Key specifications for 121744: Hardness Rating: 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM; Style Designator: SPLIT HELICAL-RIGHT HAND; Material Document and Classification: QQ-S-633,FS 1060 TO FS 1080-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.380 INCHES MAXIMUM IN. 9 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.