The Wrench,open End, cataloged under National Stock Number 5120-01-398-9302, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. The manufacturer of record is Sears, Roebuck and Co. Dba Sears Div Sears Commercial. Government technical data includes 10 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5120-01-398-9302 |
| Primary Part Number | 44521 |
| Item Name | Wrench,open End |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Manufacturer | Sears, Roebuck and Co. Dba Sears Div Sears Commercial |
| Status | ACTIVE |
| Large End Head Angle | 15.0 DEGREES NOMINAL |
| Small End Head Angle | 15.0 DEGREES NOMINAL |
| Wrenching Surface Size | 18.0 MILLIMETERS NOMINAL SECOND END MM |
| Wrenching Surface Size | 16.0 MILLIMETERS NOMINAL FIRST END MM |
| Style Designator | DOUBLE HEAD |
| Specification/standard Data | 05047-ASME B107.100/B107.39 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Nondefinitive Spec/std Data | 1 TYPE AND 1 CLASS |
| 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 |
|---|---|
| 44521 | Sears, Roebuck and Co. Dba Sears Div Sears Commercial (USA) |
| 00944521000 | Sears, Roebuck and Co. Dba Sears Div Sears Commercial (USA) |
| Reference | Meaning |
|---|---|
| B107.100 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
| B107.39 TY1CL1 | 5/1 Secondary reference U.S. Government activity |
| B107.39 | 5/1 Secondary reference The American Society of Mechanical Engineers |
| 9-44521 | 5/9 Secondary reference Sears, Roebuck and Co. Dba Sears Div Sears Commercial |
NSN 5120-01-398-9302 is a Wrench,open End, manufactured by Sears, Roebuck and Co. Dba Sears Div Sears Commercial, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
NSN 5120-01-398-9302 has 2 manufacturer part numbers on file: 44521 (Sears, Roebuck and Co. Dba Sears Div Sears Commercial), 00944521000 (Sears, Roebuck and Co. Dba Sears Div Sears Commercial).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-610-5280. Verify interchangeability with system specifications before substitution.
Key specifications for 44521: Large End Head Angle: 15.0 DEGREES NOMINAL; Small End Head Angle: 15.0 DEGREES NOMINAL; Wrenching Surface Size: 18.0 MILLIMETERS NOMINAL SECOND END MM; Wrenching Surface Size: 16.0 MILLIMETERS NOMINAL FIRST END MM. 10 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.