The Nut,plain,round, cataloged under National Stock Number 5310-00-857-5231, 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 19 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-857-5231 |
| Primary Part Number | 65251-08076-101 |
| Item Name | Nut,plain,round |
| 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 SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UN |
| Hole Configuration Style | CONFIGURATION J |
| Material Document and Classification | QQ-A-225/4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Drive Point Width | 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 3.250 INCHES IN |
| Nut Diameter | 4.000 INCHES NOMINAL IN |
| Drive Point Depth | 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| Nut Thickness | 0.560 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.052 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE OVERALL |
| Countersink Angle | 90.0 DEGREES NOMINAL NUT |
| Drive Point Quantity | 4 |
| Nut Style | ROUND |
| Thread Class | 3B |
| Thread Quantity Per Inch | 16 |
| Material | ALUMINUM ALLOY 2014 OVERALL |
| Hole Type and Quantity | 4 DRILLED |
| 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 |
|---|---|
| 65251-08076-101 | Rotair Aerospace Corp (USA) |
| 65251-08076-101 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| 65251-08076-101 | Richard Manufacturing Co., Inc. Dba Richard Manufacturing Co Inc (USA) |
NSN 5310-00-857-5231 is a Nut,plain,round, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-857-5231 has 3 manufacturer part numbers on file: 65251-08076-101 (Rotair Aerospace Corp), 65251-08076-101 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp), 65251-08076-101 (Richard Manufacturing Co., Inc. Dba Richard Manufacturing Co Inc).
Key specifications for 65251-08076-101: Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UN; Hole Configuration Style: CONFIGURATION J; Material Document and Classification: QQ-A-225/4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 19 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.