# AP Racing Master Cylinder, Ø 17.8 mm - 160 mm 5/16in-24 UNF piston rod

> AP Racing master cylinder, 17.8 mm diameter, for racing. 60° out-of-round flange, 160 mm 5/16 in-24 UNF rod, and 25.4 mm stroke.

- URL: https://www.gt2i.ch/en/master-cylinder-without-reservoir/122960-ap-racing-master-cylinder-o-178-mm-160-mm-5-16in-24-unf-piston-rod-3661768371671.html
- Reference: AP-CP4623-91T160
- Price: CHF 296.00
- Brand: AP RACING
- Availability: in stock

## Description

With its 17.8 mm bore, the AP Racing CP4623-91PRT160 master cylinder is designed for use in a hydraulic control system for braking or clutch applications in racing. It features a 60° out-of-round flange and a 160 mm 5/16 inn-24 UNF 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 a non-captive rod. Its BLUE clamp identifies the 17.8 mm diameter.
Technical Specifications
Brand: AP Racing.
Manufacturer Part Number: CP4623-91PRT160.
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 × 1.0.
Hydraulic outlet: M10 × 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: 5/16 inn-24 UNF.
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 facilitate identification of 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.
ColorDiameter in mmDiameter in inchesBLACK / ORANGE14 mm0.551 inBLACK / RED15 mm0.590 inBLACK15.9 mm0.625 in - 5/8 inBLACK / YELLOW16.8 mm0.661 inBLUE17.8 mm0.70 inGREEN19.1 mm0.75 in - 3/4 inORANGE20.6 mm0.812 in - 13/16 inRED22.2 mm0.875 in - 7/8 inWHITE23.8 mm0.937 in - 15/16 inYELLOW25.4 mm1.00 inReplacement 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.

## Features

- Product type: 
- First word type: Master cylinder