The Piston,clutch Shaft Assembly, cataloged under National Stock Number 2520-01-353-3013, is classified within Federal Supply Class 2520 (Vehicular Power Transmission Components) of the Vehicular Equipment Components group. The manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2520-01-353-3013 |
| Primary Part Number | B3433 |
| Item Name | Piston,clutch Shaft Assembly |
| FSC / FSG | 2520 / 25 — Vehicular Power Transmission Components |
| Manufacturer | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| Status | ACTIVE |
| General Characteristics Item Description | IRON; 3.734 IN. OD; 0.700 IN. LG IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| B3433 PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| Reference | Meaning |
|---|---|
| X9994A ITEM B3433 | 5/9 Secondary reference Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| X9994A | D/9 Drawing number reference only Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
NSN 2520-01-353-3013 is a Piston,clutch Shaft Assembly, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 2520, Vehicular Power Transmission Components. Status: active.
NSN 2520-01-353-3013 has 1 manufacturer part number on file: B3433 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
Key specifications for B3433: General Characteristics Item Description: IRON; 3.734 IN. OD; 0.700 IN. LG IN; End Item Identification: 3010-01-349-2357. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.