The Piston,hydraulic Brake, cataloged under National Stock Number 1630-01-234-4339, is classified within Federal Supply Class 1630 (Aircraft Wheel and Brake Systems) of the Aircraft Components and Accessories group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 1630-01-234-4339 |
| Item Name | Piston,hydraulic Brake |
| FSC / FSG | 1630 / 16 — Aircraft Wheel and Brake Systems |
| Status | ACTIVE |
| FSC Application Data | AIRCRAFT BRAKE SYSTEM |
| Length | 2.130 INCHES NOMINAL IN |
| Piston Cup | NOT INCLUDED |
| Surface Condition | EXTERNALLY GROOVED |
| Groove Depth | 0.120 INCHES NOMINAL IN |
| Outside Diameter | 1.930 INCHES NOMINAL IN |
| Steel Insert | NOT INCLUDED |
| Size Designator | 1-750 |
| Closed End Distance to Raised Seat Wear Surface | 0.250 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY |
| Construction Type | ONE-PIECE |
| Groove Width | 0.250 INCHES NOMINAL IN |
| Shoe Actuating End Type | FLAT BOTTOM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 54-419 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1630-01-234-4339 is a Piston,hydraulic Brake, classified under FSC 1630, Aircraft Wheel and Brake Systems. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6145-01-342-9613. Verify interchangeability with system specifications before substitution.
Key specifications for 1630-01-234-4339: FSC Application Data: AIRCRAFT BRAKE SYSTEM; Length: 2.130 INCHES NOMINAL IN; Piston Cup: NOT INCLUDED; Surface Condition: EXTERNALLY GROOVED. 13 specifications are 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.
NSN 1630-01-234-4339 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.