The Hook Block Assembly, cataloged under National Stock Number 3940-01-667-7421, is classified within Federal Supply Class 3940 (Blocks, Tackle, Rigging, and Slings) of the Materials Handling Equipment group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3940-01-667-7421 |
| Item Name | Hook Block Assembly |
| FSC / FSG | 3940 / 39 — Blocks, Tackle, Rigging, and Slings |
| Status | ACTIVE |
| Shell Length | 600.0 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 38309 | 3/9 Design control — primary reference Warn Industries, Inc. Dba Warn Div Warn Industries |
NSN 3940-01-667-7421 is a Hook Block Assembly, classified under FSC 3940, Blocks, Tackle, Rigging, and Slings. Status: active.
Key specifications for 3940-01-667-7421: Shell Length: 600.0 INCHES NOMINAL IN; Special Features: DIAMETER 5/16 INCHES, MIN BREAK STRENGTH IBF 9,800, CONSTRUCTION 7X19 GALV, WIRE ROPE ASSY 5/16 X 50 FEET, IN; Part Name Assigned by Controlling Agency: WIRE ROPE ASSEMBLY. 1 specification is 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.