Pull studs by taper
SK45 Pull Studs (Retention Knobs) – 15° Head, M20 Thread
SK45 pull studs (retention knobs) screw into the back of an SK45 tool holder (shank to DIN 69871, ISO 7388-1 form A) so the machine's drawbar can pull it into the spindle. PTP makes 2 SK45 pull studs: DIN 69872 with a 15° head, with an M20 thread, solid or with a coolant hole. Every stud is CNC ground, MPT tested (Magnetic Particle Testing) and proof tested at 2.5× the clamping force.
All 2 SK45 pull studs
Grouped by standard, then by head angle. Each ordering code opens its own page with the drawing and every dimension (mm).
How do I choose an SK45 pull stud?
Taper. Check that the tool holder has an SK45 shank to DIN 69871, ISO 7388-1 form A. Its dimensions are on the SK (DIN 69871) shank page.
Standard. Pick the pull stud type your machine's drawbar is built for: DIN 69872.
Head angle. DIN 69872 15°. Check that your drawbar gripper takes the head angle you order.
Thread. The SK45 shank table gives M20 for the holder's pull-stud thread.
Coolant. For through-spindle coolant, order a stud with a coolant hole (J, Ø9.5 mm).
Questions about SK45 pull studs
What thread does an SK45 pull stud have?
All 2 SK45 pull studs from PTP have an M20 thread. The SK45 shank table gives M20 for the holder thread.
Which head angles are there for SK45 pull studs?
15° (DIN 69872). Order the head angle your drawbar gripper takes.
Are there coolant-through SK45 pull studs?
Yes: 1 of the 2 SK45 codes have a coolant hole, Ø9.5 mm (J). The table lists the coolant hole of every code.