The Cylinder Assembly,hydraulic Brak, cataloged under National Stock Number 2530-00-845-8917, 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 Federal Mogul Corp Sub Wagner Brake Moog Automotive Div. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 2530-00-845-8917 |
| Primary Part Number | FF2951B |
| Item Name | Cylinder Assembly,hydraulic Brak |
| FSC / FSG | 2530 / 25 — Vehicular Brake, Steering, Axle, Wheel, and Track Components |
| Manufacturer | Federal Mogul Corp Sub Wagner Brake Moog Automotive Div |
| Status | ACTIVE |
| Actuation Method | DIRECT |
| Mounting Facility Diameter | 0.406 INCHES NOMINAL IN |
| Bleeding Feature Quantity | 2 |
| Port Thread Series Designator | UNF LOCATION NOT OTHERWISE SPECIFIED |
| Body Outside Diameter | 2.312 INCHES NOMINAL IN |
| Mounting Provision Arrangement Style | FOUR HOLE RECTANGULAR |
| Longest Vertical Distance Between Mounting Centers | 2.406 INCHES NOMINAL IN |
| Port Thread Class | 2B LOCATION NOT OTHERWISE SPECIFIED |
| Features Provided | RUBBER BOOT |
| Port Thread Quantity Per Inch | 20 LOCATION NOT OTHERWISE SPECIFIED |
| Port Thread Diameter | 0.500 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Port Location and Quantity | 3 CYLINDER HEAD END |
| Port Style | GASKET SEAL LOCATION NOT OTHERWISE SPECIFIED |
| Straight Bore Inside Diameter | 1.750 INCHES NOMINAL IN |
| Material | IRON CAST BODY |
| Mounting Type and Location | FLANGE PISTON ROD END |
| Reservoir Type | INTEGRAL |
| Mounting Provision | UNTHREADED MOUNTING HOLES |
| Longest Horizontal Distance Between Mounting Centers | 2.500 INCHES NOMINAL 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 |
|---|---|
| FF2951B | Federal Mogul Corp Sub Wagner Brake Moog Automotive Div (USA) |
| 57156R91 | Komatsu America Corp. (USA) |
| Reference | Meaning |
|---|---|
| 57156R91 | 3/9 Design control — primary reference Komatsu American Intl Co |
| 1123 | 5/9 Secondary reference Allied Automotive Allied Aftermarket Div |
| 57156R91 | 5/9 Secondary reference U.S. Government activity |
NSN 2530-00-845-8917 is a Cylinder Assembly,hydraulic Brak, manufactured by Federal Mogul Corp Sub Wagner Brake Moog Automotive Div, classified under FSC 2530, Vehicular Brake, Steering, Axle, Wheel, and Track Components. Status: active.
NSN 2530-00-845-8917 has 2 manufacturer part numbers on file: FF2951B (Federal Mogul Corp Sub Wagner Brake Moog Automotive Div), 57156R91 (Komatsu America Corp.).
1 possible match (shared part number, not a government interchangeability claim): 2540-01-221-2128. Verify interchangeability with system specifications before substitution.
Key specifications for FF2951B: Actuation Method: DIRECT; Mounting Facility Diameter: 0.406 INCHES NOMINAL IN; Overall Height: 6.312 INCHES NOMINAL IN; Bleeding Feature Quantity: 2. 19 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.