The Washer,flat, cataloged under National Stock Number 5310-00-849-8970, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Allison Transmission Inc Dba Allison Transmission, Inc. Government technical data includes 10 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-849-8970 |
| Primary Part Number | 6864088 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Allison Transmission Inc Dba Allison Transmission, Inc |
| Status | ACTIVE |
| Overall Diameter | 0.400 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN |
| Heat Treatment | AS FABRICATED |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 31.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AMS 5512 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 347 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.195 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN |
| Thickness | 0.018 INCHES MINIMUM AND 0.020 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 |
NSN 5310-00-849-8970 is a Washer,flat, manufactured by Allison Transmission Inc Dba Allison Transmission, Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-849-8970 has 3 manufacturer part numbers on file: K8831 (Rolls-Royce Airlines), 6864088 (Allison Transmission Inc Dba Allison Transmission, Inc), 6864088 (Rolls-Royce Airlines).
Key specifications for 6864088: Overall Diameter: 0.400 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN; Heat Treatment: AS FABRICATED; Hardness Rating: 26.0 ROCKWELL C MINIMUM AND 31.0 ROCKWELL C MAXIMUM; Material Document and Classification: AMS 5512 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.