The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-00-050-3238, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Smiths Tubular Systems-Laconia, Inc.. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-050-3238 |
| Primary Part Number | A26644 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Smiths Tubular Systems-Laconia, Inc. |
| Status | ACTIVE |
| Width Across Flats | 0.313 INCHES NOMINAL IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Material Document and Classification | QQ-S-633,CANC FED SPEC SINGLE MATERIAL RESPONSE NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.138 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Nut Height | 0.172 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OR ZINC NUT |
| Thread Class | 2B |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 1212 NUT |
| Material | FIBER LOCKING INSERT |
| 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 |
|---|---|
| A26644 PRIMARY | Smiths Tubular Systems-Laconia, Inc. (USA) |
| 5186681 PRIMARY | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate (USA) |
| 5186681 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| 8791404 PRIMARY | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Us Army Research, Development and Engineering Command Armament (USA) |
| Reference | Meaning |
|---|---|
| 503238 | 5/9 Secondary reference CAGE 00000 |
| 8630-23-11C | 5/9 Secondary reference Highway Products Inc |
| 8630-23-11 | 5/2 Secondary reference U.S. Government activity |
| A186681 | 5/9 Secondary reference CAGE 00000 |
| 8630-23-11C | 5/2 Secondary reference U.S. Government activity |
| 8630-23-11 | 5/9 Secondary reference Highway Products Inc |
| 107361H | 5/9 Secondary reference Navistar International Corporation Dba Navistar |
NSN 5310-00-050-3238 is a Nut,self-Locking,hexagon, manufactured by Smiths Tubular Systems-Laconia, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-050-3238 has 4 manufacturer part numbers on file: A26644 (Smiths Tubular Systems-Laconia, Inc.), 5186681 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate), 5186681 (U S Army Tank Automotive Command Amsta-Im-Mm), 8791404 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Us Army Research, Development and Engineering Command Armament).
5 possible matches (shared part number, not a government interchangeability claim): 5930-00-201-3334, 4820-00-898-3003, 3020-00-906-9371. Verify interchangeability with system specifications before substitution.
Key specifications for A26644: Width Across Flats: 0.313 INCHES NOMINAL IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Material Document and Classification: QQ-S-633,CANC FED SPEC SINGLE MATERIAL RESPONSE NUT; Thread Direction: RIGHT-HAND. 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.