OBP 1.000" bore, integral hydraulic master cylinder (25.4mm bore). Another new addition to the OBP product range, these integral alloy master cylinders are directly interchangeable with Girling master cylinders and others from Tilton, AP Racing and Alcon, although fittings and dimensions may differ depending on the manufacturer. Suitable for use as a brake or a clutch cylinder and supplied with a standard 5/16" UNF threaded push rod, which is 95mm long from the end of the rod to the alloy mounting face. Distance from cylinder mounting face to end of cast aluminium body 116mm. Outlet port: 3/8" UNF threaded female with a concave seat.