The Block,lower, cataloged under National Stock Number 3940-01-311-7757, is classified within Federal Supply Class 3940 (Blocks, Tackle, Rigging, and Slings) of the Materials Handling Equipment group. The manufacturer of record is Palfinger Marine Usa, Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Block,lower |
| FSC / FSG | 3940 — Blocks, Tackle, Rigging, and Slings (FSG 39) |
| Manufacturers | Palfinger Marine Usa, Llc (CAGE 63504) |
| Parameter | Value |
|---|---|
| NSN | 3940-01-311-7757 |
| Primary Part Number | D406593 |
| Item Name | Block,lower |
| FSC / FSG | 3940 / 39 — Blocks, Tackle, Rigging, and Slings |
| Manufacturer | Palfinger Marine Usa, Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| D406593 | Palfinger Marine Usa, Llc (USA) |
| Reference | Meaning |
|---|---|
| D406593 | 3/9 Design control — primary reference U.S. Government activity |
NSN 3940-01-311-7757 is a Block,lower, manufactured by Palfinger Marine Usa, Llc, classified under FSC 3940, Blocks, Tackle, Rigging, and Slings. Status: active.
NSN 3940-01-311-7757 has 1 manufacturer part number on file: D406593 (Palfinger Marine Usa, Llc).
1 possible match (shared part number, not a government interchangeability claim): 6625-01-526-2261. Verify interchangeability with system specifications before substitution.
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.