The Nut,plain,square, cataloged under National Stock Number 5310-00-655-7400, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Dressta North America Ltd. Government technical data includes 13 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-655-7400 |
| Primary Part Number | 290256R2 |
| Item Name | Nut,plain,square |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Dressta North America Ltd |
| Status | ACTIVE |
| Width Across Flats | 1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Hardness Rating | 25.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.000 INCHES IN |
| Nut Height | 0.847 INCHES MINIMUM AND 0.903 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | SQUARE |
| Thread Class | 2B |
| Thread Quantity Per Inch | 8 |
| Material | STEEL COMP 1045 OVERALL |
| Bearing Surface Type | CHAMFERED |
| 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 |
|---|---|
| 290256R2 | Dressta North America Ltd (USA) |
| 290256R1 | Komatsu America Corp. (USA) |
| 290256R1 | Dressta North America Ltd (USA) |
| 290256R2 | Komatsu America Corp. (USA) |
| Reference | Meaning |
|---|---|
| 290256R1 | 5/9 Secondary reference Navistar International Corporation Dba Navistar |
| 290256R1 | 5/9 Secondary reference Komatsu American Intl Co |
| 290256R1 | 5/9 Secondary reference U.S. Government activity |
| 290256R2 | 5/9 Secondary reference Navistar International Corporation Dba Navistar |
| 290256R2 | 3/9 Design control — primary reference Komatsu American Intl Co |
| 290256R2 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-00-655-7400 is a Nut,plain,square, manufactured by Dressta North America Ltd, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-655-7400 has 4 manufacturer part numbers on file: 290256R2 (Dressta North America Ltd), 290256R1 (Komatsu America Corp.), 290256R1 (Dressta North America Ltd), 290256R2 (Komatsu America Corp.).
Key specifications for 290256R2: Width Across Flats: 1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Hardness Rating: 25.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM; Material Document and Classification: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 13 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.