The Washer,flat, cataloged under National Stock Number 5310-01-251-1655, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Microflect Co. Inc. Dba Valmont/microflect. 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. 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 | 5310-01-251-1655 |
| Primary Part Number | B803 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Microflect Co. Inc. Dba Valmont/microflect |
| Status | ACTIVE |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| 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 |
|---|---|
| B803 PRIMARY | Microflect Co. Inc. Dba Valmont/microflect (USA) |
NSN 5310-01-251-1655 is a Washer,flat, manufactured by Microflect Co. Inc. Dba Valmont/microflect, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-251-1655 has 1 manufacturer part number on file: B803 (Microflect Co. Inc. Dba Valmont/microflect).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-505-3801. Verify interchangeability with system specifications before substitution.
Key specifications for B803: Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: ZINC OVERALL; Peripheral Shape Style: ROUND; Center Hole Shape Style: ROUND. 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.