Pull studs by taper
BT45 Pull Studs (Retention Knobs) – 45°, 60° and 90° Heads, M20 Thread
BT45 pull studs (retention knobs) screw into the back of a BT45 tool holder (shank to MAS 403 / JIS B6339, ISO 7388-2 type J) so the machine's drawbar can pull it into the spindle. PTP makes 3 BT45 pull studs: MAS-BT with 45°, 60° or 90° heads, with an M20 thread. Every stud is CNC ground, MPT tested (Magnetic Particle Testing) and proof tested at 2.5× the clamping force.
All 3 BT45 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 a BT45 pull stud?
Taper. Check that the tool holder has a BT45 shank to MAS 403 / JIS B6339, ISO 7388-2 type J. Its dimensions are on the MAS-BT shank page.
Standard. Pick the pull stud type your machine's drawbar is built for: MAS-BT (MAS 403).
Head angle. MAS-BT 45°, 60° or 90°. Check that your drawbar gripper takes the head angle you order.
Thread. The BT45 shank table gives M20 for the holder's pull-stud thread.
Coolant. None of the BT45 pull studs in the PTP catalogue has a coolant hole (J).
Questions about BT45 pull studs
What thread does a BT45 pull stud have?
All 3 BT45 pull studs from PTP have an M20 thread. The BT45 shank table gives M20 for the holder thread.
Which head angles are there for BT45 pull studs?
45° (MAS-BT), 60° (MAS-BT) and 90° (MAS-BT). Order the head angle your drawbar gripper takes.
Are there coolant-through BT45 pull studs?
No. None of the 3 BT45 pull studs in the PTP catalogue lists a coolant hole (J).