The Washer,flat, cataloged under National Stock Number 5310-00-641-7066, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-641-7066 |
| Primary Part Number | 181732 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Overall Diameter | 0.400 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN |
| Material Document and Classification | AMS4500 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.275 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN |
| Thickness | 0.030 INCHES MINIMUM AND 0.034 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 |
|---|---|
| 181732 | Alinabal Holdings Corporation Div Engineered Products Group (USA) |
| 181732 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 181732 | Crest Good Manufacturing Co Inc (USA) |
| 181732 | Satellite Aerospace, Incorporated Dba Satellite Aerospace Inc (USA) |
| 181732 | Trego Inc (USA) |
| 181732 | Tokyo Judoi Kogyo K.k. (JPN) |
| Reference | Meaning |
|---|---|
| 181732 | 5/9 Secondary reference Tokyo Judogi Kogyo Co. |
| 181732 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
NSN 5310-00-641-7066 is a Washer,flat, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-641-7066 has 6 manufacturer part numbers on file: 181732 (Alinabal Holdings Corporation Div Engineered Products Group), 181732 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 181732 (Crest Good Manufacturing Co Inc), 181732 (Satellite Aerospace, Incorporated Dba Satellite Aerospace Inc), 181732 (Trego Inc) and 1 more.
1 possible match (shared part number, not a government interchangeability claim): 6810-01-494-3687. Verify interchangeability with system specifications before substitution.
Key specifications for 181732: Overall Diameter: 0.400 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN; Material Document and Classification: AMS4500 ASSN STD SINGLE MATERIAL RESPONSE 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.