The Nut,self-Locking,spline, cataloged under National Stock Number 5310-01-273-2287, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-273-2287 |
| Primary Part Number | MN23-6 |
| Item Name | Nut,self-Locking,spline |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| 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) |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 8740 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 |
|---|---|
| RMLH11922-6 | Esna, Llc (USA) |
| MN23-6 PRIMARY | Hi-Shear Corporation (USA) |
| 77377-6 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MN23-6 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| SP50324-6 | Howmet Global Fastening Systems Inc (USA) |
| LH11922-6 | Esna, Llc (USA) |
| Reference | Meaning |
|---|---|
| 77377-6 | 5/9 Secondary reference U.S. Government activity |
| C7530-6 | 5/2 Secondary reference U.S. Government activity |
| LH11922-6 | 5/9 Secondary reference Harvard Industries Inc |
| C7530-6 | 7/2 Vendor item drawing reference U.S. Government activity |
| RMLH11922-6 | 5/9 Secondary reference Harvard Industries Inc |
| C7530-6 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
NSN 5310-01-273-2287 is a Nut,self-Locking,spline, manufactured by Hi-Shear Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-273-2287 has 6 manufacturer part numbers on file: RMLH11922-6 (Esna, Llc), MN23-6 (Hi-Shear Corporation), 77377-6 (Sps Technologies, Llc Dba PB Fasteners), MN23-6 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), SP50324-6 (Howmet Global Fastening Systems Inc) and 1 more.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-290-1504. Verify interchangeability with system specifications before substitution.
Key specifications for MN23-6: 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); Temp Rating: 450.0 FAHRENHEIT NOMINAL DEGF; Hardness Rating: 38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM. 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.