The Washer,flat, cataloged under National Stock Number 5310-00-256-7907, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fastener Innovation Technology, Inc. Dba F I T. Government technical data includes 10 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-256-7907 |
| Primary Part Number | W101-3 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fastener Innovation Technology, Inc. Dba F I T |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-F-14072,FINISHE300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.405 INCHES MINIMUM AND 0.425 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 302 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.252 INCHES MINIMUM AND 0.262 INCHES MAXIMUM IN |
| Thickness | 0.020 INCHES MINIMUM AND 0.030 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 |
|---|---|
| W101-3 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| D747-10 | 5/9 Secondary reference U.S. Government activity |
| D747-10 | 7/2 Vendor item drawing reference Huck International, Inc |
| R98FB004 | 5/9 Secondary reference Mcdonnell Douglas Corp Mcdonnell Douglas Electronic Systems Co |
| 993336-4 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5310-00-256-7907 is a Washer,flat, manufactured by Fastener Innovation Technology, Inc. Dba F I T, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-256-7907 has 1 manufacturer part number on file: W101-3 (Fastener Innovation Technology, Inc. Dba F I T).
3 possible matches (shared part number, not a government interchangeability claim): 5930-00-504-8680, 5310-00-576-6889, 5120-01-579-2042. Verify interchangeability with system specifications before substitution.
Key specifications for W101-3: Surface Treatment Document and Classification: MIL-F-14072,FINISHE300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.405 INCHES MINIMUM AND 0.425 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 10 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.