The Washer,flat, cataloged under National Stock Number 5310-00-088-7647, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-088-7647 |
| Primary Part Number | S1535-61262-002 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Surface Finish | 100.0 MICROINCHES TOP |
| Surface Finish | 100.0 MICROINCHES BOTTOM |
| Surface Treatment Document and Classification | QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Hardness Rating | 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | MIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 4130 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.505 INCHES MINIMUM AND 0.525 INCHES MAXIMUM IN |
| Thickness | 0.016 INCHES MINIMUM AND 0.048 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 |
|---|---|
| S1535-61262-002 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| S1535-61262-2 | Airbus Deutschland Gmbh -Werk Bremen- (DEU) |
| S1535-61262-2 | Jefco Precision Fastener, Inc. (USA) |
| Reference | Meaning |
|---|---|
| S1535-61262-2 | 5/9 Secondary reference Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
NSN 5310-00-088-7647 is a Washer,flat, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-088-7647 has 3 manufacturer part numbers on file: S1535-61262-002 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp), S1535-61262-2 (Airbus Deutschland Gmbh -Werk Bremen-), S1535-61262-2 (Jefco Precision Fastener, Inc.).
Key specifications for S1535-61262-002: Surface Finish: 100.0 MICROINCHES TOP; Surface Finish: 100.0 MICROINCHES BOTTOM; Surface Treatment Document and Classification: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN. 14 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.