The Washer,flat, cataloged under National Stock Number 5310-00-737-2137, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-737-2137 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Overall Diameter | 1.699 INCHES MINIMUM AND 1.700 INCHES MAXIMUM IN |
| Heat Treatment | AS FABRICATED |
| Material Document and Classification | MIL-S-5626,COND D MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Color | BLACK OVERALL |
| Surface Treatment | OXIDE FILM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 4140 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.235 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN |
| Thickness | 0.040 INCHES MINIMUM AND 0.041 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 |
| Reference | Meaning |
|---|---|
| 768A989P3 | 5/9 Secondary reference General Electric Company |
| 3-51423-1 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
| 768A989P3 | 3/9 Design control — primary reference U.S. Government activity |
| 3-51423-1 | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
NSN 5310-00-737-2137 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 2590-01-523-0522. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-737-2137: Overall Diameter: 1.699 INCHES MINIMUM AND 1.700 INCHES MAXIMUM IN; Heat Treatment: AS FABRICATED; Material Document and Classification: MIL-S-5626,COND D MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 11 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.