The Washer,flat, cataloged under National Stock Number 5310-01-481-5480, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bath Iron Works Corporation. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-481-5480 |
| Primary Part Number | 53239-021 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bath Iron Works Corporation |
| Status | ACTIVE |
| Cross-Sectional Shape Style | RECTANGULAR |
| Material | STEEL COMP 316 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.500 INCHES NOMINAL IN |
| Thickness | 0.090 INCHES NOMINAL 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 |
|---|---|
| 53239-021 PRIMARY | Bath Iron Works Corporation (USA) |
| 8100-1253-0238 PT NO 134 | Bath Iron Works Corporation (USA) |
| Reference | Meaning |
|---|---|
| 8100-1253-0238 | D/9 Drawing number reference only Bath Iron Works Corporation |
NSN 5310-01-481-5480 is a Washer,flat, manufactured by Bath Iron Works Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-481-5480 has 2 manufacturer part numbers on file: 53239-021 (Bath Iron Works Corporation), 8100-1253-0238 PT NO 134 (Bath Iron Works Corporation).
Key specifications for 53239-021: Cross-Sectional Shape Style: RECTANGULAR; End Item Identification: SCUTTLE:MARINE HARDWARE & HULL DOORS; Material: STEEL COMP 316 OVERALL; Center Hole Shape Style: ROUND. 5 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.