The Socket,socket Wrench, cataloged under National Stock Number 5120-00-288-9282, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. The manufacturer of record is Ampco Partners, Ltd. Dba Ampco Safety Tools. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5120-00-288-9282 |
| Primary Part Number | W-259 |
| Item Name | Socket,socket Wrench |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Manufacturer | Ampco Partners, Ltd. Dba Ampco Safety Tools |
| Status | ACTIVE |
| Drive Surface Size | 0.500 INCHES NOMINAL SINGLE END IN |
| Wrenching Surface Size | 0.312 INCHES NOMINAL SINGLE END IN |
| Wrenching End Outside Diameter | 0.500 INCHES NOMINAL IN |
| Style Designator | INTERNAL-INTERNAL |
| Features Provided | MANUAL TOOL AND NONSPARKING AND NONMAGNETIC |
| Wrenching Surface Shape | 12 POINT SINGLE END INTERNAL |
| Drive End Shape | SQUARE SINGLE END INTERNAL |
| Wrenching End Opening Depth | 0.500 INCHES NOMINAL IN |
| Drive End Outside Diameter | 1.000 INCHES NOMINAL IN |
| Special Markings | 5/16 IN. IN |
| Material | COPPER ALLOY 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 |
|---|---|
| W-259 PRIMARY | Ampco Partners, Ltd. Dba Ampco Safety Tools (USA) |
| W-921 PRIMARY | Ngk Metals Corporation Dba N G K Berylco (USA) |
| Reference | Meaning |
|---|---|
| W-921-2495 | 5/9 Secondary reference Ngk Metals Corporation Dba N G K Berylco |
| W-259 | 5/9 Secondary reference Ampco Metal Inc. Dba Ampco Metal Inc |
NSN 5120-00-288-9282 is a Socket,socket Wrench, manufactured by Ampco Partners, Ltd. Dba Ampco Safety Tools, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
NSN 5120-00-288-9282 has 2 manufacturer part numbers on file: W-259 (Ampco Partners, Ltd. Dba Ampco Safety Tools), W-921 (Ngk Metals Corporation Dba N G K Berylco).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-566-5387. Verify interchangeability with system specifications before substitution.
Key specifications for W-259: Drive Surface Size: 0.500 INCHES NOMINAL SINGLE END IN; Wrenching Surface Size: 0.312 INCHES NOMINAL SINGLE END IN; Wrenching End Outside Diameter: 0.500 INCHES NOMINAL IN; Style Designator: INTERNAL-INTERNAL. 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.