The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-133-3672, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Aar Supply Chain, Inc Dba Aar Defense Systems & Logistics. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-133-3672 |
| Primary Part Number | 1281-3CR |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Aar Supply Chain, Inc Dba Aar Defense Systems & Logistics |
| Status | ACTIVE |
| Width Across Flats | 0.440 INCHES NOMINAL IN |
| Thread Series | UNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Nut Height | 0.602 INCHES NOMINAL IN |
| Surface Treatment | SILVER OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 24 |
| Material | COPPER ALLOY OVERALL |
| Bearing Surface Type | 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 |
|---|---|
| 1281-3CR | Aar Supply Chain, Inc Dba Aar Defense Systems & Logistics (USA) |
| Reference | Meaning |
|---|---|
| 1281-3CR | 5/9 Secondary reference Rtx Corporation Div Pratt & Whitney |
| 1281-3CR | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-133-3672 is a Nut,plain,hexagon, manufactured by Aar Supply Chain, Inc Dba Aar Defense Systems & Logistics, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-133-3672 has 1 manufacturer part number on file: 1281-3CR (Aar Supply Chain, Inc Dba Aar Defense Systems & Logistics).
Key specifications for 1281-3CR: Width Across Flats: 0.440 INCHES NOMINAL IN; Thread Series: UNF; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.375 INCHES IN. 11 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.