The Lining,friction, cataloged under National Stock Number 3950-01-346-0643, is classified within Federal Supply Class 3950 (Winches, Hoists, Cranes, and Derricks) of the Materials Handling Equipment group. The manufacturer of record is Mcelroy Marine Machinery. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3950-01-346-0643 |
| Primary Part Number | A.250X2.50 |
| Item Name | Lining,friction |
| FSC / FSG | 3950 / 39 — Winches, Hoists, Cranes, and Derricks |
| Manufacturer | Mcelroy Marine Machinery |
| Status | ACTIVE |
| Lining Style | BULK LINING |
| Surface Condition and Location | ONE SIDE GROUND |
| Application Type | DRY |
| Attachment Method | RIVETED |
| Width | 2.500 INCHES NOMINAL IN |
| Thickness | 0.250 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 |
| Part Number | Manufacturer |
|---|---|
| B-3681-90 PART 16 | Mcelroy Marine Machinery (USA) |
| A.250X2.50 PRIMARY | Mcelroy Marine Machinery (USA) |
| Reference | Meaning |
|---|---|
| B-3681-90 | D/9 Drawing number reference only Mcelroy Marine Machinery |
NSN 3950-01-346-0643 is a Lining,friction, manufactured by Mcelroy Marine Machinery, classified under FSC 3950, Winches, Hoists, Cranes, and Derricks. Status: active.
NSN 3950-01-346-0643 has 2 manufacturer part numbers on file: B-3681-90 PART 16 (Mcelroy Marine Machinery), A.250X2.50 (Mcelroy Marine Machinery).
2 possible matches (shared part number, not a government interchangeability claim): 3950-01-346-1434, 3950-01-346-2722. Verify interchangeability with system specifications before substitution.
Key specifications for A.250X2.50: Lining Style: BULK LINING; Surface Condition and Location: ONE SIDE GROUND; Application Type: DRY; Attachment Method: RIVETED. 6 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.