The Key,socket Head Screw, cataloged under National Stock Number 5120-01-644-3456, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. The manufacturer of record is Eklind Tool Co. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5120-01-644-3456 |
| Primary Part Number | 15503 |
| Item Name | Key,socket Head Screw |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Manufacturer | Eklind Tool Co |
| Status | ACTIVE |
| Short Arm Length | 0.530 INCHES NOMINAL IN |
| Wrenching Surface Size | 1.5 MILLIMETERS NOMINAL BOTH ENDS MM |
| Style Designator | L-HANDLE |
| Features Provided | SHORT SERIES |
| Long Arm Length | 1.730 INCHES NOMINAL IN |
| Wrenching Surface Shape | HEXAGON BOTH ENDS EXTERNAL |
| Surface Treatment | OXIDE 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 |
|---|---|
| 15503 PRIMARY | Eklind Tool Co (USA) |
| Reference | Meaning |
|---|---|
| B18.3.2M | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
NSN 5120-01-644-3456 is a Key,socket Head Screw, manufactured by Eklind Tool Co, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
NSN 5120-01-644-3456 has 1 manufacturer part number on file: 15503 (Eklind Tool Co).
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-655-0293, 4730-01-698-2147. Verify interchangeability with system specifications before substitution.
Key specifications for 15503: Short Arm Length: 0.530 INCHES NOMINAL IN; Wrenching Surface Size: 1.5 MILLIMETERS NOMINAL BOTH ENDS MM; Style Designator: L-HANDLE; Features Provided: SHORT SERIES. 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.