The Washer,flat, cataloged under National Stock Number 5310-01-208-5263, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Honeywell International Inc. Div Aerospace - Torrance. Government technical data includes 9 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-208-5263 |
| Primary Part Number | S8157BU97-090 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Honeywell International Inc. Div Aerospace - Torrance |
| Status | ACTIVE |
| Overall Diameter | 0.680 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 SHORE DUROMETER A MAXIMUM |
| Material Document and Classification | ZZ-R-765,CLASS 2A FED SPEC SINGLE MATERIAL RESPONSE OVERALL A |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | RUBBER SILICONE CLASS Q OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.298 INCHES MINIMUM AND 0.302 INCHES MAXIMUM 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 |
|---|---|
| S8157BU97-090 | Boeing Distribution Services X, Inc. (USA) |
| S8157BU97-090 PRIMARY | Honeywell International Inc. Div Aerospace - Torrance (USA) |
NSN 5310-01-208-5263 is a Washer,flat, manufactured by Honeywell International Inc. Div Aerospace - Torrance, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-208-5263 has 2 manufacturer part numbers on file: S8157BU97-090 (Boeing Distribution Services X, Inc.), S8157BU97-090 (Honeywell International Inc. Div Aerospace - Torrance).
Key specifications for S8157BU97-090: Overall Diameter: 0.680 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN; Hardness Rating: 40.0 SHORE DUROMETER A MAXIMUM; Material Document and Classification: ZZ-R-765,CLASS 2A FED SPEC SINGLE MATERIAL RESPONSE OVERALL A; Cross-Sectional Shape Style: RECTANGULAR. 9 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.