The Wrench,open End, cataloged under National Stock Number 5120-01-355-2252, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. The manufacturer of record is The Stanley Works Dba Stanley Proto. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5120-01-355-2252 |
| Primary Part Number | J4020P |
| Item Name | Wrench,open End |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Manufacturer | The Stanley Works Dba Stanley Proto |
| Status | ACTIVE |
| Large End Head Angle | 15.0 DEGREES NOMINAL |
| Small End Head Angle | 15.0 DEGREES NOMINAL |
| Wrenching Surface Size | 0.250 INCHES NOMINAL FIRST END IN |
| Wrenching Surface Size | 0.312 INCHES NOMINAL SECOND END IN |
| Style Designator | DOUBLE HEAD |
| Wrenching Surface Shape | OVAL BOTH ENDS INTERNAL |
| Surface Treatment | CHROMIUM OVERALL |
| Material | STEEL 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 |
|---|---|
| J4020P PRIMARY | The Stanley Works Dba Stanley Proto (USA) |
| Reference | Meaning |
|---|---|
| 2A299 | 5/9 Secondary reference W.w. Grainger, Inc. Div Government Sales Division |
| 4020P | 5/9 Secondary reference The Stanley Works Dba Stanley Proto |
NSN 5120-01-355-2252 is a Wrench,open End, manufactured by The Stanley Works Dba Stanley Proto, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
NSN 5120-01-355-2252 has 1 manufacturer part number on file: J4020P (The Stanley Works Dba Stanley Proto).
1 possible match (shared part number, not a government interchangeability claim): 5940-01-603-9854. Verify interchangeability with system specifications before substitution.
Key specifications for J4020P: Large End Head Angle: 15.0 DEGREES NOMINAL; Small End Head Angle: 15.0 DEGREES NOMINAL; Wrenching Surface Size: 0.250 INCHES NOMINAL FIRST END IN; Wrenching Surface Size: 0.312 INCHES NOMINAL SECOND END IN. 8 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.