The Nut,sleeve, cataloged under National Stock Number 5310-00-285-1632, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 13 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-285-1632 |
| Primary Part Number | 3B281 |
| Item Name | Nut,sleeve |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Flange Width Across Flats | 1.125 INCHES NOMINAL IN |
| Nut Length | 0.688 INCHES NOMINAL IN |
| Flange Thickness | 0.312 INCHES NOMINAL IN |
| Thread Series | UNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.875 INCHES IN |
| Nut Diameter | 1.188 INCHES NOMINAL IN |
| Cross-Sectional Shape | HEXAGONAL FLANGE |
| Cross-Sectional Shape | ROUND NUT |
| Surface Treatment | PHOSPHATE OVERALL |
| Thread Class | 2B |
| Thread Quantity Per Inch | 14 |
| Material | STEEL 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 |
|---|---|
| 3B281 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 5310-00-285-1632 is a Nut,sleeve, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-285-1632 has 1 manufacturer part number on file: 3B281 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 3B281: Flange Width Across Flats: 1.125 INCHES NOMINAL IN; Nut Length: 0.688 INCHES NOMINAL IN; Flange Thickness: 0.312 INCHES NOMINAL IN; Thread Series: UNF. 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.