The Washer,flat, cataloged under National Stock Number 5310-01-661-7891, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-661-7891 |
| Primary Part Number | J2655FAN0438S1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Surface Treatment Document and Classification | ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.438 INCHES NOMINAL IN |
| Hardness Rating | 70.0 ROCKWELL B MINIMUM AND 95.0 ROCKWELL B MAXIMUM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Specification/standard Data | 81343-SAE J2655 NATIONAL STD/SPEC |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 316L OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.188 INCHES NOMINAL IN |
| Thickness | 0.049 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 |
|---|---|
| 96659A109 | Mcmaster-Carr Supply Co (USA) |
| J2655FAN0438S1 PRIMARY | Sae International Dba Sae International (USA) |
| SS-7/16SAE | Superior Washer & Gasket Corp (USA) |
| Reference | Meaning |
|---|---|
| J2655FAN0438S1 | 3/9 Design control — primary reference U.S. Government activity |
| 4103623 | 5/1 Secondary reference Med-Eng Holdings, Ulc |
NSN 5310-01-661-7891 is a Washer,flat, manufactured by Sae International Dba Sae International, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-661-7891 has 3 manufacturer part numbers on file: 96659A109 (Mcmaster-Carr Supply Co), J2655FAN0438S1 (Sae International Dba Sae International), SS-7/16SAE (Superior Washer & Gasket Corp).
Key specifications for J2655FAN0438S1: Surface Treatment Document and Classification: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.438 INCHES NOMINAL IN; Hardness Rating: 70.0 ROCKWELL B MINIMUM AND 95.0 ROCKWELL B MAXIMUM; Cross-Sectional Shape Style: RECTANGULAR. 11 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.