The Washer,flat, cataloged under National Stock Number 5310-00-877-4949, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Dresser, Llc. Government technical data includes 7 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 | 5310-00-877-4949 |
| Primary Part Number | B277 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Dresser, Llc |
| Status | ACTIVE |
| Overall Diameter | 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | IRON OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.334 INCHES MINIMUM AND 0.354 INCHES MAXIMUM IN |
| Thickness | 0.052 INCHES MINIMUM AND 0.072 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 |
| Part Number | Manufacturer |
|---|---|
| B277 PRIMARY | Dresser, Llc (USA) |
NSN 5310-00-877-4949 is a Washer,flat, manufactured by Dresser, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-877-4949 has 1 manufacturer part number on file: B277 (Dresser, Llc).
1 possible match (shared part number, not a government interchangeability claim): 6240-00-965-1381. Verify interchangeability with system specifications before substitution.
Key specifications for B277: Overall Diameter: 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: IRON OVERALL. 7 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.