The Cylinder,hydraulic Brake,master, cataloged under National Stock Number 2530-01-397-7057, is classified within Federal Supply Class 2530 (Vehicular Brake, Steering, Axle, Wheel, and Track Components) of the Vehicular Equipment Components group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2530-01-397-7057 |
| Item Name | Cylinder,hydraulic Brake,master |
| FSC / FSG | 2530 / 25 — Vehicular Brake, Steering, Axle, Wheel, and Track Components |
| Status | ACTIVE |
| Mounting Facility Thread Class | 2A A |
| Mounting Facility Thread Quantity Per Inch | 24 |
| Port Thread Quantity Per Inch | 27 LOCATION NOT OTHERWISE SPECIFIED |
| Port Thread Diameter | 0.125 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Mounting Facility Thread Diameter | 0.312 INCHES NOMINAL IN |
| Port Location and Quantity | 1 CYLINDER HEAD END |
| Bore Diameter | 0.625 INCHES NOMINAL IN |
| Mounting Type and Location | SCREW PISTON ROD END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 20-120-003 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2530-01-397-7057 is a Cylinder,hydraulic Brake,master, classified under FSC 2530, Vehicular Brake, Steering, Axle, Wheel, and Track Components. Status: active.
Key specifications for 2530-01-397-7057: Mounting Facility Thread Class: 2A A; Overall Length: 7.250 INCHES NOMINAL IN; Mounting Facility Thread Quantity Per Inch: 24; Port Thread Quantity Per Inch: 27 LOCATION NOT OTHERWISE SPECIFIED. 8 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.
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.