The Washer,flat, cataloged under National Stock Number 5310-00-171-4591, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Woodward, Inc. Div Fuel Systems and Controls. Government technical data includes 9 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. 3 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 | 5310-00-171-4591 |
| Primary Part Number | 402909 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Woodward, Inc. Div Fuel Systems and Controls |
| Status | ACTIVE |
| Overall Diameter | 0.310 INCHES NOMINAL IN |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 416 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.1255 INCHES NOMINAL IN |
| Thickness | 0.025 INCHES MINIMUM AND 0.035 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 |
|---|---|
| 402909 PRIMARY | Woodward, Inc. Div Fuel Systems and Controls (USA) |
NSN 5310-00-171-4591 is a Washer,flat, manufactured by Woodward, Inc. Div Fuel Systems and Controls, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-171-4591 has 1 manufacturer part number on file: 402909 (Woodward, Inc. Div Fuel Systems and Controls).
3 possible matches (shared part number, not a government interchangeability claim): 5950-00-426-6624, 1560-00-732-2759, 5365-01-125-3970. Verify interchangeability with system specifications before substitution.
Key specifications for 402909: Overall Diameter: 0.310 INCHES NOMINAL IN; Material Document and Classification: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: PASSIVATE OVERALL. 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.