The Butterfly,wind,level, cataloged under National Stock Number 3950-01-400-3848, is classified within Federal Supply Class 3950 (Winches, Hoists, Cranes, and Derricks) of the Materials Handling Equipment group. The manufacturer of record is Lake Shore Systems, Inc.. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3950-01-400-3848 |
| Primary Part Number | 2B1-1972 |
| Item Name | Butterfly,wind,level |
| FSC / FSG | 3950 / 39 — Winches, Hoists, Cranes, and Derricks |
| Manufacturer | Lake Shore Systems, Inc. |
| Status | ACTIVE |
| Overall Diameter | 2.625 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| 7D3-05012 PIECE 15 | Lake Shore Systems, Inc. (USA) |
| 2B1-1972 PRIMARY | Lake Shore Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 7D3-05012 | D/9 Drawing number reference only Lake Shore Systems, Inc. |
NSN 3950-01-400-3848 is a Butterfly,wind,level, manufactured by Lake Shore Systems, Inc., classified under FSC 3950, Winches, Hoists, Cranes, and Derricks. Status: active.
NSN 3950-01-400-3848 has 2 manufacturer part numbers on file: 7D3-05012 PIECE 15 (Lake Shore Systems, Inc.), 2B1-1972 (Lake Shore Systems, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-406-1993. Verify interchangeability with system specifications before substitution.
Key specifications for 2B1-1972: Overall Diameter: 2.625 INCHES NOMINAL IN; Overall Length: 4.000 INCHES NOMINAL IN; End Item Identification: WEPON SYSTEM E/I 170' PATROL COASTAL; Material: COPPER ALLOY. 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.