BT35 Pull Studs (Retention Knobs) – 45°, 60° and 90° Heads, M12 Thread

BT35 pull studs (retention knobs) screw into the back of a BT35 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 BT35 pull studs: MAS-BT with 45°, 60° or 90° heads, with an M12 thread. Every stud is CNC ground, MPT tested (Magnetic Particle Testing) and proof tested at 2.5× the clamping force.

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All 3 BT35 pull studs

Grouped by standard, then by head angle. Each ordering code opens its own page with the drawing and every dimension (mm).

MAS-BT (MAS 403): 3 BT35 pull studs

Ordering code	Head angle (θ)	Thread (TH)	Knob Ø (A)	Overall length (D)	Coolant hole Ø (J)	Seal
PSI4B3501	45°	M12	12.5 mm	45 mm	–	–
PSI3B3502	60°	M12	12.5 mm	45 mm	–	–
PSI5B3503	90°	M12	12.5 mm	45 mm	–	–

How do I choose a BT35 pull stud?

Taper. Check that the tool holder has a BT35 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 BT35 shank table gives M12 for the holder's pull-stud thread.
Coolant. None of the BT35 pull studs in the PTP catalogue has a coolant hole (J).

Questions about BT35 pull studs

What thread does a BT35 pull stud have?

All 3 BT35 pull studs from PTP have an M12 thread. The BT35 shank table gives M12 for the holder thread.

BT shank dimensions

Which head angles are there for BT35 pull studs?

45° (MAS-BT), 60° (MAS-BT) and 90° (MAS-BT). Order the head angle your drawbar gripper takes.

MAS-BT pull studs

Are there coolant-through BT35 pull studs?

No. None of the 3 BT35 pull studs in the PTP catalogue lists a coolant hole (J).