The Nut,self-Locking,clinch, cataloged under National Stock Number 5310-00-273-4538, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Esna, Llc. Government technical data includes 18 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-273-4538 |
| Primary Part Number | F22NKCFM2-40 |
| Item Name | Nut,self-Locking,clinch |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Esna, Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE NUT |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Temp Rating | 350.0 FAHRENHEIT NOMINAL DEGF |
| Nut Counterbore Depth | 0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.112 INCHES IN |
| Nut Diameter | 0.198 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.128 INCHES MINIMUM AND 0.133 INCHES MAXIMUM NUT IN |
| Pilot Diameter | 0.158 INCHES MINIMUM AND 0.162 INCHES MAXIMUM IN |
| Pilot Length | 0.057 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Nut Height | 0.233 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM NUT |
| Thread Class | 3B |
| Thread Quantity Per Inch | 40 |
| Material | STEEL NUT |
| Material | PLASTIC POLYAMIDE NYLON LOCKING INSERT |
| Material | PLASTIC POLYAMIDE NYLON CAP |
| 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 |
|---|---|
| F22NKCFM2-40 PRIMARY | Esna, Llc (USA) |
| Reference | Meaning |
|---|---|
| 333-0984-000 | 5/9 Secondary reference U.S. Government activity |
| F22NKCFM2-40 | 3/9 Design control — primary reference Harvard Industries Inc |
NSN 5310-00-273-4538 is a Nut,self-Locking,clinch, manufactured by Esna, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-273-4538 has 1 manufacturer part number on file: F22NKCFM2-40 (Esna, Llc).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-134-5122. Verify interchangeability with system specifications before substitution.
Key specifications for F22NKCFM2-40: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE NUT; Thread Series: UNIFIED NATIONAL COARSE (UNC); Temp Rating: 350.0 FAHRENHEIT NOMINAL DEGF; Nut Counterbore Depth: 0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM NUT IN. 18 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.