The Block,tackle Assembly, cataloged under National Stock Number 3940-01-521-3765, is classified within Federal Supply Class 3940 (Blocks, Tackle, Rigging, and Slings) of the Materials Handling Equipment group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3940-01-521-3765 |
| Primary Part Number | 585-6406777-AY87 |
| Item Name | Block,tackle Assembly |
| FSC / FSG | 3940 / 39 — Blocks, Tackle, Rigging, and Slings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Accessory Components and Quantity | BRACKET ASSEMBLY 1; SHEAVE, CABLE 1; GUARD, SHEAVE 2; SETSCREW 1; PIN, SHEAVE 1; BUSHING, SHEAVE 2; SCREW CAP 2; WASHER, LOCK, SPRING, HELICAL 2 |
| Material | COPPER ALLOY AND PLASTIC AND STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 585-6406777-AY87 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 211063633 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 3940-01-521-3765 is a Block,tackle Assembly, manufactured by Naval Sea Systems Command, classified under FSC 3940, Blocks, Tackle, Rigging, and Slings. Status: active.
NSN 3940-01-521-3765 has 1 manufacturer part number on file: 585-6406777-AY87 (Naval Sea Systems Command).
Key specifications for 585-6406777-AY87: Accessory Components and Quantity: BRACKET ASSEMBLY 1; SHEAVE, CABLE 1; GUARD, SHEAVE 2; SETSCREW 1; PIN, SHEAVE 1; BUSHING, SHEAVE 2; SCREW CAP 2; WASHER, LOCK, SPRING, HELICAL 2; Part Name Assigned by Controlling Agency: SHEAVE ASSEMBLY, RETRACTING; End Item Identification: VALVE, NEEDLE; Material: COPPER ALLOY AND PLASTIC AND STEEL CORROSION RESISTING. 2 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.