The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-975-1574, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Entwistle Company Llc. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-975-1574 |
| Primary Part Number | 323178-1 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Entwistle Company Llc |
| Status | ACTIVE |
| Width Across Flats | 2.125 INCHES NOMINAL IN |
| Thread Series | UNF |
| Material Document and Classification | MIL-S-6758,COND F4 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.250 INCHES IN |
| Nut Height | 0.532 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP 4130 OVERALL |
| Bearing Surface Type | CHAMFERED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 323178-1 | The Entwistle Company Llc (USA) |
| 323178-1 | Apex Manufacturing Company, Inc. Dba Apex Manufacturing Co (USA) |
| 323178-1 | James Choe Dba Pioneer Machine and Tooling Co Div Pioneer Machine (USA) |
| 323178-1 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 323178-1 | Quality Socket Screw Manufacturing Corp (USA) |
| Reference | Meaning |
|---|---|
| 323178-1 | 3/2 Design control — primary reference U.S. Government activity |
| 323178-1 | 5/9 Secondary reference Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc |
| 323178-1 | 5/9 Secondary reference Jmt Machine Company |
NSN 5310-00-975-1574 is a Nut,plain,hexagon, manufactured by The Entwistle Company Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-975-1574 has 5 manufacturer part numbers on file: 323178-1 (The Entwistle Company Llc), 323178-1 (Apex Manufacturing Company, Inc. Dba Apex Manufacturing Co), 323178-1 (James Choe Dba Pioneer Machine and Tooling Co Div Pioneer Machine), 323178-1 (Sps Technologies, Llc Dba PB Fasteners), 323178-1 (Quality Socket Screw Manufacturing Corp).
Key specifications for 323178-1: Width Across Flats: 2.125 INCHES NOMINAL IN; Thread Series: UNF; Material Document and Classification: MIL-S-6758,COND F4 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND. 11 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.