The Block,tackle, cataloged under National Stock Number 3940-00-638-7945, is classified within Federal Supply Class 3940 (Blocks, Tackle, Rigging, and Slings) of the Materials Handling Equipment group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3940-00-638-7945 |
| Item Name | Block,tackle |
| FSC / FSG | 3940 / 39 — Blocks, Tackle, Rigging, and Slings |
| Status | ACTIVE |
| Maximum Tackle Diameter Accommodated | 0.250 INCHES0.250 INCHES IN |
| Tackle Locking Device | NOT INCLUDEDNOT INCLUDED |
| Sheave Outside Diameter | 1.938 INCHES NOMINAL1.938 INCHES NOMINAL IN |
| Tackle Accommodated Type | WIRE ROPEWIRE ROPE |
| Block Type | REGULARREGULAR |
| Center Pin Diameter | 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN |
| Style Designator | OVAL PATTERNOVAL PATTERN |
| Bearing Type | BALLBALL |
| Surface Treatment | ANODIZE SHEAVEANODIZE SHEAVE |
| Sheave Quantity | 11 |
| Material | ALUMINUM SHEAVEALUMINUM SHEAVE |
| Material | MAGNESIUM SHELLMAGNESIUM SHELL |
| Material | STEEL BEARINGSTEEL BEARING |
| Material | STEEL CENTER PINSTEEL CENTER PIN |
| Antitoppling Device | NOT INCLUDEDNOT INCLUDED |
| 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 |
|---|---|
| 4585267 | 3/2 Design control — primary reference U.S. Government activity |
| 4585267 | 5/9 Secondary reference The Boeing Company |
NSN 3940-00-638-7945 is a Block,tackle, classified under FSC 3940, Blocks, Tackle, Rigging, and Slings. Status: active.
Key specifications for 3940-00-638-7945: Maximum Tackle Diameter Accommodated: 0.250 INCHES0.250 INCHES IN; Tackle Locking Device: NOT INCLUDEDNOT INCLUDED; Sheave Outside Diameter: 1.938 INCHES NOMINAL1.938 INCHES NOMINAL IN; Tackle Accommodated Type: WIRE ROPEWIRE ROPE. 15 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.