The Washer,flat, cataloged under National Stock Number 5310-00-899-5941, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-899-5941 |
| Primary Part Number | 10889966 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 63.0 MICROINCHES TOP |
| Overall Diameter | 1.060 INCHES NOMINAL IN |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | SAE ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 4130 OR STEEL COMP 4140 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.789 INCHES MINIMUM AND 0.793 INCHES MAXIMUM IN |
| Thickness | 0.074 INCHES MINIMUM AND 0.076 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 |
|---|---|
| 10889966 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| 10889966 | Us Army Aviation and Missile Command (USA) |
| Reference | Meaning |
|---|---|
| 5310008995941 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
NSN 5310-00-899-5941 is a Washer,flat, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-899-5941 has 2 manufacturer part numbers on file: 10889966 (U S Army Tank Automotive Command Amsta-Im-Mm), 10889966 (Us Army Aviation and Missile Command).
Key specifications for 10889966: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 63.0 MICROINCHES TOP; Overall Diameter: 1.060 INCHES NOMINAL IN; Hardness Rating: 38.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM. 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.