The Washer,flat, cataloged under National Stock Number 5310-01-533-7135, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Commercial. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-533-7135 |
| Primary Part Number | 66-1051-4 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Commercial |
| Status | ACTIVE |
| Overall Diameter | 1.580 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-5059.COM+301,AISI 301 MIL STD ALL MATERIAL RESPONSES OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 301 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.161 INCHES NOMINAL IN |
| Thickness | 0.016 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 |
|---|---|
| 66-1051-4 PRIMARY | The Boeing Company Div Commercial (USA) |
| Reference | Meaning |
|---|---|
| 66-1051-4 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-533-7135 is a Washer,flat, manufactured by The Boeing Company Div Commercial, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-533-7135 has 1 manufacturer part number on file: 66-1051-4 (The Boeing Company Div Commercial).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-669-4332. Verify interchangeability with system specifications before substitution.
Key specifications for 66-1051-4: Overall Diameter: 1.580 INCHES NOMINAL IN; Material Document and Classification: MIL-S-5059.COM+301,AISI 301 MIL STD ALL MATERIAL RESPONSES OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 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.