The Washer,flat, cataloged under National Stock Number 5310-01-100-0631, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hatz Diesel of America Inc. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-100-0631 |
| Primary Part Number | 03214800 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hatz Diesel of America Inc |
| Status | ACTIVE |
| Overall Diameter | 19.8 MILLIMETERS MINIMUM AND 20.0 MILLIMETERS MAXIMUM MM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Thickness | 1.9 MILLIMETERS MINIMUM AND 2.2 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| 03214800 PRIMARY | Hatz Diesel of America Inc (USA) |
| Reference | Meaning |
|---|---|
| 82173 | 5/9 Secondary reference Davey Compressor Co Div of Keco Industries Inc |
NSN 5310-01-100-0631 is a Washer,flat, manufactured by Hatz Diesel of America Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-100-0631 has 1 manufacturer part number on file: 03214800 (Hatz Diesel of America Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-274-3150, 5905-01-360-4822. Verify interchangeability with system specifications before substitution.
Key specifications for 03214800: Overall Diameter: 19.8 MILLIMETERS MINIMUM AND 20.0 MILLIMETERS MAXIMUM MM; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: STEEL OVERALL. 6 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.