The Washer,flat, cataloged under National Stock Number 5310-01-533-5304, 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 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-533-5304 |
| Primary Part Number | 98017A690 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Overall Diameter | 0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 ROCKWELL B NOMINAL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Nondefinitive Spec/std Data | AN960 TYPE |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL AND STEEL COMP 321 AND STEEL COMP 347 AND STEEL COMP 348 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.225 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN |
| Thickness | 0.200 INCHES MINIMUM AND 0.420 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 |
|---|---|
| 98017A690 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5310-01-533-5304 is a Washer,flat, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-533-5304 has 1 manufacturer part number on file: 98017A690 (Mcmaster-Carr Supply Co).
Key specifications for 98017A690: Overall Diameter: 0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN; Hardness Rating: 70.0 ROCKWELL B NOMINAL; Cross-Sectional Shape Style: RECTANGULAR; Nondefinitive Spec/std Data: AN960 TYPE. 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.