The Nut,plain,round, cataloged under National Stock Number 5310-00-943-1990, 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 20 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 | 5310-00-943-1990 |
| Primary Part Number | S6135-20053 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Thread Series | UNS |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM |
| Hole Configuration Style | CONFIGURATION F |
| Material Document and Classification | MIL-S-6758,COND D MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Drive Point Width | 0.250 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.156 INCHES IN |
| Nut Diameter | 2.750 INCHES NOMINAL IN |
| Drive Point Depth | 0.094 INCHES NOMINAL IN |
| Undercut Thickness | 0.100 INCHES NOMINAL IN |
| Nut Thickness | 0.312 INCHES NOMINAL IN |
| Small End Diameter | 2.480 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.067 INCHES NOMINAL IN |
| Countersink Angle | 90.0 DEGREES NOMINAL NUT |
| Drive Point Quantity | 8 |
| Nut Style | ROUND |
| Thread Class | 3B |
| Thread Quantity Per Inch | 18 |
| Material | STEEL COMP 4130 OR STEEL COMP E4340 OVERALL |
| Hole Type and Quantity | 8 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 |
|---|---|
| S6135-20053 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
NSN 5310-00-943-1990 is a Nut,plain,round, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-943-1990 has 1 manufacturer part number on file: S6135-20053 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for S6135-20053: Thread Series: UNS; Hardness Rating: 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM; Hole Configuration Style: CONFIGURATION F; Material Document and Classification: MIL-S-6758,COND D MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL. 20 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.