Pull Stud

Domestic application of CNC machine tool handle and matching pull stud standards:
1. National Standard GB10944-89 “7:24 Taper Tool Shank No. 40, 45 and 50 Taper Shanks for Automatic Tool Changing Machine Tools”
2. Pull studs specified in the national standard, “Pull studs for 7:24 tapered tool shanks with 40, 45 and 50 taper shanks for automatic tool changing machine tools”
3. Japanese standard JISB6339-1986 “Tool handle and pull stud for machining center machine tools”
4. National Standard GB3837-83 “Machine Tool 7:24 Cone Connection”
The tool holder in the TSG tool system, its code (according to the 1990 national standard for approval) consists of four parts, the meaning of each part is as follows:
JT – Indicates tool handle code.
45 – Indicates the taper specification for the taper shank.
Introduction to the standard of taper shank for common tools of CNC tools:
National standard GB 10945-89
“Pull studs for 7:24 taper tool shanks 40, 45 and 50 taper shanks for automatic tool changers”
It is formulated with reference to the international standard ISO 7388/2-1984. The dimensions are the same, and it is divided into two types: A type and B type:
The bevel angle of the tensioning surface of the A-type pull stud is 15°, which is used for the tensioning device without steel ball, the code is “LDA”;
The bevel angle of the tensioning surface of the B-type pull stud is 45°, which is used for the tensioning device with steel ball, codenamed “LDB”.
Both have through holes for coolant flow.
The pull studs of the German standard DIN 6988-1987 are of type A and type B:
Type A with through hole.
Type B does not have through holes, but has annular grooves for sealing rings to prevent coolant leakage from the rear.
The bevel angle of the tension surface of the two types of pull studs is 15°, and they are used for tension devices without steel balls.
The Japanese standard JIS B 6339:1998 has only one type of pull stud. The bevel angle of the pull stud is 15°. It is used for tensioning devices without steel balls, codenamed “xxP”.
There are two types of pull studs of the Japan Machinery Industry Association standard MAS-403: type I and type II:
The bevel angle of the tension surface of the type I pull stud is 30°, which is used for the tension device without steel balls;
The bevel angle of the tension surface of the type II pull stud is 45°, which is used for the tension device with steel balls.
When using, it should be noted that the head length of these two kinds of pull studs is smaller than the head diameter of the pull stud of the JIS B 6339:1998 standard, and the neck length is longer, and its code is “PxxT”.
The American standard AMSE B5.50-1994 has only one type of pull stud, the bevel angle of the pull stud is 45°, and there is no centering cylinder between the flange and the thread.
The thread should be UNC thread. For the convenience of users, domestic manufacturers also change it to the corresponding metric thread, and other dimensions remain unchanged.