The Nut,plain,spline, cataloged under National Stock Number 5310-01-441-8597, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Unicorp.. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-441-8597 |
| Primary Part Number | 40R23 |
| Item Name | Nut,plain,spline |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Unicorp. |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Material Document and Classification | ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nut Counterbore Depth | 0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Nut Diameter | 0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.293 INCHES MINIMUM AND 0.297 INCHES MAXIMUM NUT IN |
| Pilot Diameter | 0.364 INCHES MINIMUM AND 0.368 INCHES MAXIMUM IN |
| Pilot Length | 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN |
| Nut Height | 0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Countersink Angle | 90.0 DEGREES NOMINAL NUT |
| Nut Style | SPLINE |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 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 |
|---|---|
| 40R23 PRIMARY | Unicorp. (USA) |
| Reference | Meaning |
|---|---|
| 3168812-0012 | 5/9 Secondary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 5310-01-441-8597 is a Nut,plain,spline, manufactured by Unicorp., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-441-8597 has 1 manufacturer part number on file: 40R23 (Unicorp.).
Key specifications for 40R23: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL COARSE (UNC); Material Document and Classification: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nut Counterbore Depth: 0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM NUT IN. 17 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.