The Key,socket Head Screw, cataloged under National Stock Number 5120-00-189-2985, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5120-00-189-2985 |
| Primary Part Number | MIL-K-21120 |
| Item Name | Key,socket Head Screw |
| FSC / FSG | 5120 / 51 — No Item Name Available |
| Manufacturer | Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M |
| Status | ACTIVE |
| Style Designator | L-HANDLE |
| Material | COPPER ALLOY OVERALL |
| Short Arm Length | 1.750 INCHES NOMINAL IN |
| Specification/standard Data | 05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Wrenching Surface Shape | HEXAGON BOTH ENDS EXTERNAL |
| Long Arm Length | 5.250 INCHES NOMINAL IN |
| Wrenching Surface Size | 0.438 INCHES NOMINAL BOTH ENDS IN |
| Features Provided | NONMAGNETIC AND NONSPARKING |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MIL-K-21120 | Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M |
| L-11-2591 | Ngk Metals Corporation Dba N G K Berylco (USA) |
| B18.3 | The American Society of Mechanical Engineers (USA) |
| W-1050-S | Ampco Partners, Ltd. Dba Ampco Safety Tools (USA) |
| A-A-2477 | Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA) |
| L-11 | Ngk Metals Corporation Dba N G K Berylco (USA) |
| W-1050-S | Ampco Metal Inc. Dba Ampco Metal Inc (USA) |
NSN 5120-00-189-2985 is a Key,socket Head Screw, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5120 (No Item Name Available). Status: active.
NSN 5120-00-189-2985 has 7 cross-referenced part numbers: MIL-K-21120 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), L-11-2591 (Ngk Metals Corporation Dba N G K Berylco), B18.3 (The American Society of Mechanical Engineers), W-1050-S (Ampco Partners, Ltd. Dba Ampco Safety Tools), A-A-2477 (Federal Commercial Item Description Promulgated by General Services Administration Washington DC) and 2 more.
There are 12 known substitutes for 5120-00-189-2985: 4730-00-028-7021, 9905-00-045-3627, 3120-00-148-7742 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for MIL-K-21120: Style Designator: L-HANDLE; Material: COPPER ALLOY OVERALL; Short Arm Length: 1.750 INCHES NOMINAL IN; Specification/standard Data: 05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD. 9 total characteristics are documented in the Federal Logistics Information System.