The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-178-1648, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fairbanks Morse, Llc. Government technical data includes 12 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-178-1648 |
| Primary Part Number | 81344094N |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fairbanks Morse, Llc |
| Status | ACTIVE |
| Width Across Flats | 0.669 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | ASTM B633,TY 2,CL 3 ASSN STD 1ST TREATMENT RESPONSE OR QQ-P-416,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Nut Height | 0.341 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN |
| Surface Treatment | ZINC AND CHROMATE OR CADMIUM AND CHROMATE OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Bearing Surface Type | CHAMFERED OR WASHER FACED |
| 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 |
|---|---|
| 81344094N PRIMARY | Fairbanks Morse, Llc (USA) |
| Reference | Meaning |
|---|---|
| 91124647 | 5/9 Secondary reference U.S. Government activity |
| 81344094N | 3/9 Design control — primary reference U.S. Government activity |
| 91124647N | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5310-01-178-1648 is a Nut,plain,hexagon, manufactured by Fairbanks Morse, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-178-1648 has 1 manufacturer part number on file: 81344094N (Fairbanks Morse, Llc).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-428-9626. Verify interchangeability with system specifications before substitution.
Key specifications for 81344094N: Width Across Flats: 0.669 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN; Surface Treatment Document and Classification: ASTM B633,TY 2,CL 3 ASSN STD 1ST TREATMENT RESPONSE OR QQ-P-416,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL COARSE (UNC); Thread Direction: RIGHT-HAND. 12 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.