The Washer,flat, cataloged under National Stock Number 5310-00-143-6907, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Dresser Industries Inc Leroi Div. Government technical data includes 10 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-143-6907 |
| Primary Part Number | H15-604 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Dresser Industries Inc Leroi Div |
| Status | ACTIVE |
| Surface Finish | 5.0 MICROINCHES BOTTOM |
| Surface Finish | 5.0 MICROINCHES TOP |
| Overall Diameter | 1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 420 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.622 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN |
| Thickness | 0.045 INCHES MINIMUM AND 0.047 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 |
| Part Number | Manufacturer |
|---|---|
| H15-604 PRIMARY | Dresser Industries Inc Leroi Div (USA) |
| Reference | Meaning |
|---|---|
| C58449-3PC29 | 5/9 Secondary reference Westinghouse Electric Corp |
| C58449-7PC35 | 5/9 Secondary reference Westinghouse Electric Corp |
| C58449-7PC29 | 5/9 Secondary reference Westinghouse Electric Corp |
| 181768 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-143-6907 is a Washer,flat, manufactured by Dresser Industries Inc Leroi Div, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-143-6907 has 1 manufacturer part number on file: H15-604 (Dresser Industries Inc Leroi Div).
1 possible match (shared part number, not a government interchangeability claim): 5930-00-468-2160. Verify interchangeability with system specifications before substitution.
Key specifications for H15-604: Surface Finish: 5.0 MICROINCHES BOTTOM; Surface Finish: 5.0 MICROINCHES TOP; Overall Diameter: 1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN; Material Document and Classification: AISI 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.