The Washer,recessed, cataloged under National Stock Number 5310-01-306-3520, 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 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 | 5310-01-306-3520 |
| Primary Part Number | SS5103D08 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC 1ST TREATMENT RESPONSE OR MIL-C-5541 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| Style Designator | RECESSED |
| Material Document and Classification | QQ-A-250/8,H34 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/8,H36 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/8,H38 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.870 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN |
| Material Thickness | 0.080 INCHES NOMINAL IN |
| Recess Diameter | 0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN |
| Surface Treatment | ANODIZE OR CHROMATE OVERALL |
| Material | ALUMINUM ALLOY 5052 OVERALL |
| Hole Diameter | 0.504 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Recess Angle | 90.0 DEGREES NOMINAL |
| 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 |
|---|---|
| SS5103D08 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
NSN 5310-01-306-3520 is a Washer,recessed, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-306-3520 has 1 manufacturer part number on file: SS5103D08 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for SS5103D08: Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC 1ST TREATMENT RESPONSE OR MIL-C-5541 MIL SPEC 2ND TREATMENT RESPONSE OVERALL; Style Designator: RECESSED; Material Document and Classification: QQ-A-250/8,H34 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/8,H36 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/8,H38 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.870 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN. 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.