The Nut,self-Locking,clinch, cataloged under National Stock Number 5310-00-016-0777, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 17 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-016-0777 |
| Primary Part Number | MK7231-04 |
| Item Name | Nut,self-Locking,clinch |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Thread Series | UNJC |
| Precious Material | SILVER |
| Temp Rating | 900.0 FAHRENHEIT NOMINAL DEGF |
| Nut Counterbore Depth | 0.035 INCHES MINIMUM NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.112 INCHES IN |
| Nut Diameter | 0.219 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.112 INCHES MINIMUM NUT IN |
| Pilot Diameter | 0.155 INCHES MAXIMUM IN |
| Pilot Length | 0.035 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.195 INCHES NOMINAL IN |
| Surface Treatment | SILVER OVERALL |
| Nut Style | CLINCH |
| Thread Class | 3B |
| Thread Quantity Per Inch | 40 |
| Material | IRON ALLOY 660 OVERALL |
| 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 |
|---|---|
| MK7231-04 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| LHC4526-40 | 5/9 Secondary reference Harvard Industries Inc |
| MK7231-04 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Microdot Products |
| LHC4256-40 | 5/9 Secondary reference Harvard Industries Inc |
| MRPN4-40SUL-E0290 | 3/2 Design control — primary reference U.S. Government activity |
| 419440-2 | 7/2 Vendor item drawing reference U.S. Government activity |
| 419449-2 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-00-016-0777 is a Nut,self-Locking,clinch, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-016-0777 has 1 manufacturer part number on file: MK7231-04 (Howmet Global Fastening Systems Inc).
Key specifications for MK7231-04: Thread Series: UNJC; Precious Material: SILVER; Temp Rating: 900.0 FAHRENHEIT NOMINAL DEGF; Nut Counterbore Depth: 0.035 INCHES MINIMUM NUT IN. 17 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.