The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-723-4887, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Certified Stainless Service, Inc. Dba West-Mark Div West-Mark. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-723-4887 |
| Primary Part Number | F1-0520660 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Certified Stainless Service, Inc. Dba West-Mark Div West-Mark |
| Status | ACTIVE |
| Width Across Flats | 0.45 INCHES MINIMUM AND 0.57 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.2500 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.15 INCHES MINIMUM AND 0.27 INCHES MAXIMUM IN |
| Surface Treatment | ZINC OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL 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 |
|---|---|
| F1-0520660 PRIMARY | Certified Stainless Service, Inc. Dba West-Mark Div West-Mark (USA) |
| Reference | Meaning |
|---|---|
| F1-0520660 REV 0 | D/9 Drawing number reference only Certified Stainless Service, Inc. Dba West-Mark Div West-Mark |
NSN 5310-01-723-4887 is a Nut,self-Locking,hexagon, manufactured by Certified Stainless Service, Inc. Dba West-Mark Div West-Mark, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-723-4887 has 1 manufacturer part number on file: F1-0520660 (Certified Stainless Service, Inc. Dba West-Mark Div West-Mark).
Key specifications for F1-0520660: Width Across Flats: 0.45 INCHES MINIMUM AND 0.57 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.2500 INCHES IN. 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.