AP Racing Master Cylinder, 17.8 mm, 160 mm, CP4623-91PRM160 - AP-CP4623-91M160 - CP4623-91PRM160 - 3661768078785

AP Racing Master Cylinder, Ø 17.8 mm - 160 mm M8 x 1.25 piston rod

Reference: AP-CP4623-91M160

Supplier Ref.: CP4623-91PRM160

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The AP Racing master cylinder (Ø 17.8 mm), part number CP4623-91PRM160, is designed for competition-grade hydraulic brake and clutch systems. It features a 60° out-of-round flange and a 160 mm M8 x 1.25 threaded rod, measured from the mounting point.

The 60° out-of-round flange facilitates access to the mounting bolts. The hydraulic openings are metric.

The forged aluminum body and the 60° out-of-round flange meet the demands of compact mountings. The range also includes versions with non-captive rods. Its BLUE clamp indicates a diameter of 17.8 mm.

Technical Specifications

Brand: AP Racing.
Manufacturer Part Number: CP4623-91PRM160.
Range: CP4623.
Actuation: Push.
Mounting: 60° out-of-round flange.
Master cylinder diameter: 17.8 mm - 0.70 in.
Identification clamp color: BLUE.
Total stroke: 25.4 mm.
Hydraulic inlet: M12 Ã— 1.0.
Hydraulic outlet: M10 Ã— 1.0.
Stroke before supply shuts off: 0.68 to 1.09 mm - short.
Center distance of mounting holes: 57.15 mm.
Mounting hole diameter: 8.69 to 8.81 mm.
Shaft thread: M8 Ã— 1.25.
Rod length from mounting point: 160 mm.
Body material: Forged aluminum.

Color-coded diameter identification

AP Racing master cylinders come with a small colored plastic clamp wrapped around the body to make it easier to identify their diameter. The part number and nominal diameter are also marked on the body.

The following table applies to push-type master cylinders. This part number has a BLUE clamp corresponding to 17.8 mm - 0.70 in.

Color	Diameter in mm	Diameter in inches
BLACK / ORANGE	14 mm	0.551 in
BLACK / RED	15 mm	0.590 in
BLACK	15.9 mm	0.625 in - 5/8 in
BLACK / YELLOW	16.8 mm	0.661 in
BLUE	17.8 mm	0.70 in
GREEN	19.1 mm	0.75 in - 3/4 in
ORANGE	20.6 mm	0.812 in - 13/16 in
RED	22.2 mm	0.875 in - 7/8 in
WHITE	23.8 mm	0.937 in - 15/16 in
YELLOW	25.4 mm	1.00 in

Replacement Parts and Repair Kit

Repair kit part number: AP Racing CP2623-91RK, sold separately.

Mounting and Connections

Check the mounting, connections, and alignment of the control unit. The 160 mm dimension refers to the length of the rod from the mounting point, not the length of the body. The shaft thread is for the mechanical connection; it is separate from the hydraulic threads.

Master cylinders are individually adjusted during manufacturing: do not interchange rods, pistons, or internal components between different assemblies.

Photo and Master Cylinder Selection

The photo shows the AP Racing CP4623 range and is not binding regarding the color of the identification clamp. To select the model suitable for your mounting, refer to the part number and technical specifications listed in this data sheet.

Before ordering, be sure to check the master cylinder diameter, thread sizes, rod length, and fastening type. If you have any questions, our technicians can help you select the correct part number for your system. Feel free to contact them.

Key Features

Forged aluminum body.
60° out-of-round flange: facilitates access to mounting hardware.
Compact design.
Short stroke before the fluid supply shuts off.
Metric hydraulic inlet and outlet.
Visual identification: BLUE clamp for the 17.8 mm diameter.

Products intended for vehicle modification for competition purposes may render their use prohibited on public roads, insofar as they significantly alter the vehicle's characteristics as specified in the type-approval certificate issued by the relevant authorities (noise level, pollutant emissions, maximum speed, tire dimensions, etc.).