The Washer,flat, cataloged under National Stock Number 5310-00-374-2817, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is John Reiner & Co. Inc.. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-374-2817 |
| Primary Part Number | A4CM81-1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | John Reiner & Co. Inc. |
| Status | ACTIVE |
| Overall Diameter | 1.281 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Inside Left Corner Chamfer Angle | 45.0 DEGREES NOMINAL |
| Peripheral Shape Style | ROUND |
| Material | RUBBER SYNTHETIC OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.750 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 |
|---|---|
| A4CM81-1 | John Reiner & Co. Inc. (USA) |
| Reference | Meaning |
|---|---|
| D8293-4-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-374-2817 is a Washer,flat, manufactured by John Reiner & Co. Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-374-2817 has 1 manufacturer part number on file: A4CM81-1 (John Reiner & Co. Inc.).
Key specifications for A4CM81-1: Overall Diameter: 1.281 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Inside Left Corner Chamfer Angle: 45.0 DEGREES NOMINAL; Peripheral Shape Style: ROUND. 7 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.