The Nut,self-Locking,round, cataloged under National Stock Number 5310-01-054-4647, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Aljers Llc. Government technical data includes 16 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-054-4647 |
| Primary Part Number | 81581-R |
| Item Name | Nut,self-Locking,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Aljers Llc |
| Status | ACTIVE |
| Thread Series | UNS |
| Drive Point Width | 0.250 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.751 INCHES IN |
| Nut Diameter | 3.625 INCHES NOMINAL IN |
| Drive Point Depth | 0.125 INCHES NOMINAL IN |
| Undercut Thickness | 0.141 INCHES NOMINAL IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Nut Thickness | 0.625 INCHES NOMINAL IN |
| Small End Diameter | 3.125 INCHES NOMINAL IN |
| Drive Point Quantity | 4 |
| Nut Style | ROUND |
| Thread Class | 3B |
| Thread Quantity Per Inch | 18 |
| Material | PLASTIC POLYAMIDE NYLON LOCKING INSERT |
| Material | STEEL COMP 1018 OR STEEL COMP 4140 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 |
|---|---|
| 81581-R | Aljers Llc (USA) |
| Reference | Meaning |
|---|---|
| 81581-R | 5/9 Secondary reference U.S. Government activity |
| 3444-10 ITEM 48 | 5/2 Secondary reference U.S. Government activity |
| BHM-14 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 81581-R | 3/2 Design control — primary reference U.S. Government activity |
| 3444-10 ITEM 48 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-054-4647 is a Nut,self-Locking,round, manufactured by Aljers Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-054-4647 has 1 manufacturer part number on file: 81581-R (Aljers Llc).
Key specifications for 81581-R: Thread Series: UNS; Drive Point Width: 0.250 INCHES NOMINAL IN; Thread Direction: RIGHT-HAND; Nominal Thread Size: 2.751 INCHES IN. 16 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.