The Washer,flat, cataloged under National Stock Number 5310-01-158-0239, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Westerbeke Corporation. Government technical data includes 4 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 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 | 5310-01-158-0239 |
| Primary Part Number | 11943 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Westerbeke Corporation |
| Status | ACTIVE |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| 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 |
|---|---|
| 11943 PRIMARY | Westerbeke Corporation (USA) |
NSN 5310-01-158-0239 is a Washer,flat, manufactured by Westerbeke Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-158-0239 has 1 manufacturer part number on file: 11943 (Westerbeke Corporation).
2 possible matches (shared part number, not a government interchangeability claim): 8920-01-333-6729, 4820-01-643-7528. Verify interchangeability with system specifications before substitution.
Key specifications for 11943: Cross-Sectional Shape Style: RECTANGULAR; Special Features: ITEM IS USED IN THE FUEL SYSTEM INJECTORS OF A WESTERBEKE CORP. ENGINE ON A 95 FT U.S. COAST GUARD CUTTER FT; Peripheral Shape Style: ROUND; Material: COPPER ALLOY OVERALL. 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.