The Key,socket Head Screw, cataloged under National Stock Number 5120-01-045-4899, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. The manufacturer of record is Blackwood J. Blackwood & Son Pty Ltd. Government technical data includes 9 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5120-01-045-4899 |
| Primary Part Number | 0198 5205 |
| Item Name | Key,socket Head Screw |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Manufacturer | Blackwood J. Blackwood & Son Pty Ltd |
| Status | ACTIVE |
| Short Arm Length | 21.0 MILLIMETERS MINIMUM AND 25.0 MILLIMETERS MAXIMUM MM |
| Wrenching Surface Size | 19.0 MILLIMETERS NOMINAL BOTH ENDS MM |
| Style Designator | L-HANDLE |
| Features Provided | SHORT SERIES |
| Long Arm Length | 171.0 MILLIMETERS MINIMUM AND 185.0 MILLIMETERS MAXIMUM MM |
| Specification/standard Data | 05047-ASME B18.3.2 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| 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 |
|---|---|
| 0198 5205 | Blackwood J. Blackwood & Son Pty Ltd (AUS) |
| Reference | Meaning |
|---|---|
| 57142 | 5/9 Secondary reference Apex Tool Group, Llc Dba Nicholson |
| B18.3.2 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
| 57142 | 5/9 Secondary reference Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. |
| 68080 | 5/9 Secondary reference Allen Mfg Co Sub of Chicago Pneumatic Tool Co |
NSN 5120-01-045-4899 is a Key,socket Head Screw, manufactured by Blackwood J. Blackwood & Son Pty Ltd, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
NSN 5120-01-045-4899 has 1 manufacturer part number on file: 0198 5205 (Blackwood J. Blackwood & Son Pty Ltd).
3 possible matches (shared part number, not a government interchangeability claim): 9905-01-050-2327, 6150-01-149-9056, 3455-01-647-0346. Verify interchangeability with system specifications before substitution.
Key specifications for 0198 5205: Short Arm Length: 21.0 MILLIMETERS MINIMUM AND 25.0 MILLIMETERS MAXIMUM MM; Wrenching Surface Size: 19.0 MILLIMETERS NOMINAL BOTH ENDS MM; Style Designator: L-HANDLE; Overall Length: 199.0 MILLIMETERS MAXIMUM MM. 9 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.