The Piston,hydraulic Brake,master Cy, cataloged under National Stock Number 1630-00-439-3640, is classified within Federal Supply Class 1630 (Aircraft Wheel and Brake Systems) of the Aircraft Components and Accessories group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1630-00-439-3640 |
| Item Name | Piston,hydraulic Brake,master Cy |
| FSC / FSG | 1630 / 16 — Aircraft Wheel and Brake Systems |
| Status | ACTIVE |
| Actuator Link Connection Type | FLAT BOTTOM SOCKET |
| Length | 7.190 INCHES NOMINAL IN |
| Socket Depth | 3.060 INCHES NOMINAL IN |
| Surface Feature | EXTERNALLY GROOVED FOR SECONDARY CUP |
| Size Designator | 2-1/2 |
| Secondary Cup | NOT INCLUDED |
| Cup Protector | NOT INCLUDED |
| 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 |
|---|---|
| 204-076-315-3 | 3/2 Design control — primary reference U.S. Government activity |
| 204-076-315-3 | 5/9 Secondary reference General Atomics Aerotec Systems Gmbh |
NSN 1630-00-439-3640 is a Piston,hydraulic Brake,master Cy, classified under FSC 1630, Aircraft Wheel and Brake Systems. Status: active.
Key specifications for 1630-00-439-3640: Actuator Link Connection Type: FLAT BOTTOM SOCKET; Length: 7.190 INCHES NOMINAL IN; Socket Depth: 3.060 INCHES NOMINAL IN; Surface Feature: EXTERNALLY GROOVED FOR SECONDARY CUP. 7 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 1630-00-439-3640 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.