The Cylinder,hydraulic Brake,master, cataloged under National Stock Number 2530-00-278-2240, is classified within Federal Supply Class 2530 (Vehicular Brake, Steering, Axle, Wheel, and Track Components) of the Vehicular Equipment Components group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 22 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2530-00-278-2240 |
| Primary Part Number | 8667448 |
| Item Name | Cylinder,hydraulic Brake,master |
| FSC / FSG | 2530 / 25 — Vehicular Brake, Steering, Axle, Wheel, and Track Components |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Actuation Method | DIRECT |
| Mounting Facility Thread Class | 2B |
| Shaft Diameter | 1.750 INCHES NOMINAL IN |
| Port Thread Series Designator | UNF LOCATION NOT OTHERWISE SPECIFIED |
| Extension Length | 3.000 INCHES NOMINAL IN |
| Mounting Provision Arrangement Style | THREE HOLE BOLT CIRCLE |
| Mounting Facility Thread Quantity Per Inch | 16 |
| Port Thread Class | 3B LOCATION NOT OTHERWISE SPECIFIED |
| Features Provided | FILLER PLUG |
| Port Thread Quantity Per Inch | 18 LOCATION NOT OTHERWISE SPECIFIED |
| Pedal Shaft Extension Direction | LEFT |
| Mounting Facility Thread Length | 0.500 INCHES NOMINAL IN |
| Port Thread Diameter | 0.562 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Mounting Facility Thread Diameter | 0.375 INCHES NOMINAL IN |
| Port Location and Quantity | 1 CYLINDER HEAD END |
| Port Style | FLARE LOCATION NOT OTHERWISE SPECIFIED |
| Mounting Facility Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Bore Diameter | 1.750 INCHES NOMINAL IN |
| Material | STEEL BODY |
| Mounting Type and Location | LUG(S) CENTER SECTION |
| Mounting Facility Thread Direction | RIGHT-HAND |
| Mounting Provision | THREADED MOUNTING HOLES |
| 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 |
|---|---|
| 8667448 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 651C | 5/2 Secondary reference U.S. Government activity |
NSN 2530-00-278-2240 is a Cylinder,hydraulic Brake,master, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2530, Vehicular Brake, Steering, Axle, Wheel, and Track Components. Status: active.
NSN 2530-00-278-2240 has 1 manufacturer part number on file: 8667448 (U S Army Tank Automotive Command Amsta-Im-Mm).
2 possible matches (shared part number, not a government interchangeability claim): 5961-00-799-8708, 6685-01-580-7991. Verify interchangeability with system specifications before substitution.
Key specifications for 8667448: Actuation Method: DIRECT; Overall Height: 5.500 INCHES NOMINAL IN; Mounting Facility Thread Class: 2B; Shaft Diameter: 1.750 INCHES NOMINAL IN. 22 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.