The Hook Block Assembly, cataloged under National Stock Number 3940-01-526-8746, is classified within Federal Supply Class 3940 (Blocks, Tackle, Rigging, and Slings) of the Materials Handling Equipment group. The manufacturer of record is Breeze-Eastern Llc. Government technical data includes 12 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 | 3940-01-526-8746 |
| Primary Part Number | HK-121-2 |
| Item Name | Hook Block Assembly |
| FSC / FSG | 3940 / 39 — Blocks, Tackle, Rigging, and Slings |
| Manufacturer | Breeze-Eastern Llc |
| Status | ACTIVE |
| Attachment Style | FLATTED LOOSE SWIVEL SAFETY SNAP HOOK |
| Maximum Tackle Diameter Accommodated | 0.750 INCHES IN |
| Load Rating | 30000.0 POUNDS MAXIMUM LBS |
| Tackle Locking Device | NOT INCLUDED |
| Sheave Outside Diameter | 10.000 INCHES NOMINAL IN |
| Tackle Accommodated Type | WIRE ROPE |
| Block Type | REGULAR |
| Style Designator | OVAL PATTERN |
| Shell Length | 18.000 INCHES NOMINAL IN |
| Sheave Quantity | 1 |
| Material | STEEL OVERALL |
| Antitoppling Device | NOT INCLUDED |
| 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 |
|---|---|
| HK-121-2 PRIMARY | Breeze-Eastern Llc (USA) |
NSN 3940-01-526-8746 is a Hook Block Assembly, manufactured by Breeze-Eastern Llc, classified under FSC 3940, Blocks, Tackle, Rigging, and Slings. Status: active.
NSN 3940-01-526-8746 has 1 manufacturer part number on file: HK-121-2 (Breeze-Eastern Llc).
Key specifications for HK-121-2: Attachment Style: FLATTED LOOSE SWIVEL SAFETY SNAP HOOK; Maximum Tackle Diameter Accommodated: 0.750 INCHES IN; Load Rating: 30000.0 POUNDS MAXIMUM LBS; Tackle Locking Device: NOT INCLUDED. 12 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.