The Nut,self-Locking,spline, cataloged under National Stock Number 5310-01-050-4255, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-050-4255 |
| Primary Part Number | 77377-4 |
| Item Name | Nut,self-Locking,spline |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AISI 8740 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Nut Diameter | 0.531 INCHES MAXIMUM IN |
| Pilot Length | 0.086 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.199 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | SPLINE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | STEEL 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 |
|---|---|
| 77377-4 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| RMLH1192-4 | Esna, Llc (USA) |
| SP50324-4 | Howmet Global Fastening Systems Inc (USA) |
| MN23-4 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| 5310PL0741346 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 5310PL2173192 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 77377-4 | 5/9 Secondary reference U.S. Government activity |
| LH11922-4 | 5/9 Secondary reference Harvard Industries Inc |
| C7530-4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-050-4255 is a Nut,self-Locking,spline, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-050-4255 has 4 manufacturer part numbers on file: 77377-4 (Sps Technologies, Llc Dba PB Fasteners), RMLH1192-4 (Esna, Llc), SP50324-4 (Howmet Global Fastening Systems Inc), MN23-4 (Hi-Shear Corporation).
Key specifications for 77377-4: Lubrication: DRY FILM LUBRICANT; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Hardness Rating: 38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM. 16 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.