The Wrench,open End, cataloged under National Stock Number 5120-01-656-4258, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. The manufacturer of record is Textron Systems Corp. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5120-01-656-4258 |
| Primary Part Number | 9AY8405 |
| Item Name | Wrench,open End |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Manufacturer | Textron Systems Corp |
| Status | ACTIVE |
| Drive Surface Size | 1.1185 INCHES MINIMUM AND 1.205 INCHES MAXIMUM SINGLE END IN |
| Wrenching Surface Size | 0.1875 INCHES NOMINAL SINGLE END IN |
| Style Designator | SINGLE HEAD |
| Wrenching Surface Shape | SQUARE SINGLE END EXTERNAL |
| Drive End Shape | OVAL SINGLE END INTERNAL |
| Head Angle | 14.0 DEGREES MINIMUM AND 16.0 DEGREES MAXIMUM |
| Material | STEEL COMP 4140 OVERALL |
| Head Thickness | 0.28 INCHES MINIMUM AND 0.31 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 9AY8405 PRIMARY | Textron Systems Corp (USA) |
NSN 5120-01-656-4258 is a Wrench,open End, manufactured by Textron Systems Corp, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
NSN 5120-01-656-4258 has 1 manufacturer part number on file: 9AY8405 (Textron Systems Corp).
Key specifications for 9AY8405: Drive Surface Size: 1.1185 INCHES MINIMUM AND 1.205 INCHES MAXIMUM SINGLE END IN; Wrenching Surface Size: 0.1875 INCHES NOMINAL SINGLE END IN; Style Designator: SINGLE HEAD; Overall Length: 6.33 INCHES MINIMUM AND 6.39 INCHES MAXIMUM 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.