Self Opening Die Heads

TACO self-opening die heads are heavy-duty and are made with high precision and all parts are hardened and ground. The head can be mounted on turret lathe, screw machine or automatic and semi-automatic for cutting right and left hand as well as fine, course and pipe threads. All TACO die heads have a fine adjustment screw which enables setting of chasers to cut over - or undersize.

TACO dia heads are most suitable for heavy duty work and mass production. They open automatically when the selected thread length reaches, eliminating the necessity of reversal of the direction of working spindle.


The chasers numbered 1 to 4 guided by a keyway are inserted into four corresponding spring loaded slots in the head. By turning the cam ring and with drawing the locking bolt the chasers are kept in position. The closing of the head is then effected by turning the handle, attached to the front part, anti-clockwise until the locking bolt springs into the prepared position. The loading of the cam ring takes place at an angle of 25A .


TACO die heads, shown in the table below, are normally supplied with a straight shank. The shank is held in position by three screws, and therefore head with any form of flanged shank, such as Morse Taper or other, can be supplied to suit the requirement.