The Washer,flat, cataloged under National Stock Number 5310-01-204-9062, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-204-9062 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Overall Diameter | 1.875 INCHES NOMINAL IN |
| Hardness Rating | 56.0 ROCKWELL C NOMINAL |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Features Provided | CASEHARDENED |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1074 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.128 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Thickness | 0.0359 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 | C |
| Reference | Meaning |
|---|---|
| 8950-B-2-751 ITEM 15 | 5/1 Secondary reference Ashcroft Inc Dba Heise |
| 978B34A | 3/1 Design control — primary reference Ashcroft Inc Dba Heise |
NSN 5310-01-204-9062 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-204-9062: Overall Diameter: 1.875 INCHES NOMINAL IN; Hardness Rating: 56.0 ROCKWELL C NOMINAL; Criticality Code Justification: ZZZY; Material Document and Classification: ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE 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.