The Washer,flat, cataloged under National Stock Number 5310-01-554-9975, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 12 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-554-9975 |
| Primary Part Number | 7662064-31 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-N-290, CLASS 1. GRADE F NATIONAL STD/SPEC ALL TREATMENT RESPONSES OVERALL |
| Overall Diameter | 1.047 INCHES NOMINAL IN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM |
| Material Document and Classification | ASTM B168, CONDITION A. SPRING TEMPER ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Color | SILVER OVERALL |
| Surface Treatment | NICKEL OVERALL |
| Peripheral Shape Style | ROUND |
| Material | NICKEL ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.648 INCHES NOMINAL IN |
| Thickness | 0.045 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 |
|---|---|
| 7662064-31 PRIMARY | Naval Sea Systems Command (USA) |
| MS51496-113 | Naval Sea Systems Command (USA) |
NSN 5310-01-554-9975 is a Washer,flat, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-554-9975 has 2 manufacturer part numbers on file: 7662064-31 (Naval Sea Systems Command), MS51496-113 (Naval Sea Systems Command).
Key specifications for 7662064-31: Surface Treatment Document and Classification: QQ-N-290, CLASS 1. GRADE F NATIONAL STD/SPEC ALL TREATMENT RESPONSES OVERALL; Overall Diameter: 1.047 INCHES NOMINAL IN; Hardness Rating: 30.0 ROCKWELL C MINIMUM; Material Document and Classification: ASTM B168, CONDITION A. SPRING TEMPER ASSN STD ALL MATERIAL RESPONSES OVERALL. 12 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.