The Wrench,open End, cataloged under National Stock Number 5120-01-550-0506, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5120-01-550-0506 |
| Item Name | Wrench,open End |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Status | ACTIVE |
| Surface Treatment Document and Classification | ASME B46.1 ASSN STD ALL TREATMENT RESPONSES OVERALL |
| Drive Surface Size | 3.778 INCHES MINIMUM AND 3.800 INCHES MAXIMUM SINGLE END IN |
| Small End Head Thickness | 0.500 INCHES NOMINAL IN |
| Small End Outside Diameter | 0.750 INCHES NOMINAL IN |
| Opening Width | 2.000 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-6758,COND CD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 5.250 INCHES NOMINAL IN |
| Wrenching Surface Shape | ROUND SINGLE END EXTERNAL |
| Drive End Shape | PENTAGON SINGLE END INTERNAL |
| Material | STEEL COMP 4130 OVERALL |
| Head Thickness | 1.250 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 524420-11 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5120-01-550-0506 is a Wrench,open End, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
Key specifications for 5120-01-550-0506: Surface Treatment Document and Classification: ASME B46.1 ASSN STD ALL TREATMENT RESPONSES OVERALL; Drive Surface Size: 3.778 INCHES MINIMUM AND 3.800 INCHES MAXIMUM SINGLE END IN; Small End Head Thickness: 0.500 INCHES NOMINAL IN; Small End Outside Diameter: 0.750 INCHES NOMINAL IN. 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.