The Washer,flat, cataloged under National Stock Number 5310-00-281-5021, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mack Trucks Inc Parts Opn. Government technical data includes 9 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through both NSN and commercial part number lookups. 13 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5310-00-281-5021 |
| Primary Part Number | 834231 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mack Trucks Inc Parts Opn |
| Status | CANCELLED |
| Overall Diameter | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN |
| Material Document and Classification | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1010 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.194 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Thickness | 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 834231 PRIMARY | Mack Trucks Inc Parts Opn (USA) |
| 225803 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| 834231 PRIMARY | General Motors Corp (USA) |
| Reference | Meaning |
|---|---|
| 1907036 | 5/9 Secondary reference General Motors Corp Delco Remy Div |
| 5310002815021 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 16A7686 | 3/2 Design control — primary reference U.S. Government activity |
| A063947 | 5/9 Secondary reference Sasco Inc Canadian Div |
| 834231 | 5/9 Secondary reference General Motors Corp Delco Remy Div |
| 1907036 | 5/9 Secondary reference General Motors Corp |
| 1902988 | 5/9 Secondary reference General Motors Corp AC-Delco Div Government Order Dept |
| 834231 | C/1 Advisory reference — outside the item-of-supply concept Borgwarner Pds (anderson), L.l.c. |
| 5310002815021 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
| 361917 | 5/9 Secondary reference White Motor Corp |
| 1902988 | 5/9 Secondary reference General Motors Corp Delco Remy Div |
| 1902988 | 5/9 Secondary reference Rolls-Royce Solutions America Inc |
| 1902988 | 5/9 Secondary reference General Motors Corp |
NSN 5310-00-281-5021 is a Washer,flat, manufactured by Mack Trucks Inc Parts Opn, classified under FSC 5310, Nuts and Washers. Status: cancelled.
NSN 5310-00-281-5021 has 3 manufacturer part numbers on file: 834231 (Mack Trucks Inc Parts Opn), 225803 (U S Army Tank Automotive Command Amsta-Im-Mm), 834231 (General Motors Corp).
3 possible matches (shared part number, not a government interchangeability claim): 6940-00-371-5299, 1280-00-509-5739, 5342-01-211-1234. Verify interchangeability with system specifications before substitution.
Key specifications for 834231: Overall Diameter: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN; Material Document and Classification: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: ZINC 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.
NSN 5310-00-281-5021 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.