The Washer,flat, cataloged under National Stock Number 5310-00-424-5506, 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 8 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. 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 | 5310-00-424-5506 |
| Primary Part Number | 20-223-1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Dresser Industries Inc Leroi Div |
| Status | ACTIVE |
| Width Across Flats | 1.000 INCHES NOMINAL IN |
| Length | 1.187 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | RECTANGULAR |
| Material | IRON OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.531 INCHES NOMINAL IN |
| Thickness | 0.022 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 | X |
| Part Number | Manufacturer |
|---|---|
| 20-223-1 PRIMARY | Dresser Industries Inc Leroi Div (USA) |
NSN 5310-00-424-5506 is a Washer,flat, manufactured by Dresser Industries Inc Leroi Div, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-424-5506 has 1 manufacturer part number on file: 20-223-1 (Dresser Industries Inc Leroi Div).
2 possible matches (shared part number, not a government interchangeability claim): 2805-00-561-9829, 5920-01-048-6907. Verify interchangeability with system specifications before substitution.
Key specifications for 20-223-1: Width Across Flats: 1.000 INCHES NOMINAL IN; Length: 1.187 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: RECTANGULAR. 8 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.