The Washer,flat, cataloged under National Stock Number 5310-01-615-0643, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 11 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-615-0643 |
| Primary Part Number | 91434A155 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Surface Treatment Document and Classification | BLACK LUSTER COATED MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.8125 INCHES NOMINAL IN |
| Material Document and Classification | ASME B18.22.1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Color | BLACK OVERALL |
| Surface Treatment | ENAMEL SEMIGLOSS OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.40625 INCHES NOMINAL IN |
| Thickness | 0.05 INCHES MINIMUM AND 0.08 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 |
|---|---|
| 91434A155 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5310-01-615-0643 is a Washer,flat, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-615-0643 has 1 manufacturer part number on file: 91434A155 (Mcmaster-Carr Supply Co).
Key specifications for 91434A155: Surface Treatment Document and Classification: BLACK LUSTER COATED MFR REF SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.8125 INCHES NOMINAL IN; Material Document and Classification: ASME B18.22.1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 11 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.