The Washer,flat, cataloged under National Stock Number 5310-00-453-1903, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bsi Standards Limited. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Item Name | Washer,flat |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Honeywell Aerospace Yeovil Div Aerospace -Yeovil (CAGE U1605); Bsi Standards Limited (CAGE K7766) |
| Parameter | Value |
|---|---|
| NSN | 5310-00-453-1903 |
| Primary Part Number | SP27A |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| 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 |
|---|---|
| C0M5740-7 | Honeywell Aerospace Yeovil Div Aerospace -Yeovil (GBR) |
| SP27A PRIMARY | Bsi Standards Limited (GBR) |
| 21171-027 PRIMARY | Honeywell Aerospace Yeovil Div Aerospace -Yeovil (GBR) |
| Reference | Meaning |
|---|---|
| SP27A | 5/9 Secondary reference G K N Kings Norton Ltd |
NSN 5310-00-453-1903 is a Washer,flat, manufactured by Bsi Standards Limited, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-453-1903 has 3 manufacturer part numbers on file: C0M5740-7 (Honeywell Aerospace Yeovil Div Aerospace -Yeovil), SP27A (Bsi Standards Limited), 21171-027 (Honeywell Aerospace Yeovil Div Aerospace -Yeovil).
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.