The Nut,plain,assembled Washer, cataloged under National Stock Number 5310-01-111-4264, 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 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-111-4264 |
| Primary Part Number | KFN542-5 |
| Item Name | Nut,plain,assembled Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Washer Outside Diameter | 0.560 INCHES MAXIMUM IN |
| Width Across Flats | 0.419 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE NUT |
| Nut Counterbore Depth | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Counterbore Diameter | 0.347 INCHES MINIMUM AND 0.352 INCHES MAXIMUM NUT IN |
| Nut Height | 0.340 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Nut Style | FLAT WITH TURNED BACK EDGE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL WASHER |
| Material | STEEL COMP 8740 OR STEEL COMP E4340 NUT |
| 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 |
|---|---|
| BH00516A5 | Bristol Industries, Llc (USA) |
| KFN542-5 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| KFN542-5 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| KFN542-5 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Microdot Products |
| GHN10009-7 | 5/2 Secondary reference U.S. Government activity |
| 5310PL0821522 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5310-01-111-4264 is a Nut,plain,assembled Washer, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-111-4264 has 3 manufacturer part numbers on file: BH00516A5 (Bristol Industries, Llc), KFN542-5 (Howmet Global Fastening Systems Inc), KFN542-5 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for KFN542-5: Overall Height: 0.340 INCHES NOMINAL IN; Washer Outside Diameter: 0.560 INCHES MAXIMUM IN; Width Across Flats: 0.419 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.