Pull studs by taper
BT40 Pull Studs (Retention Knobs) – 45°, 60°, 90° and 15° Heads, M16 and 5/8" Threads
BT40 pull studs (retention knobs) screw into the back of a BT40 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 22 BT40 pull studs: MAS-BT with 45°, 60° or 90° heads, MG MEGA Strength with a 45° head and JIS B6339 with a 15° head, with M16 and 5/8" threads, 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 22 BT40 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): 13 BT40 pull studs
| Ordering code | Head angle (θ) | Thread (TH) | Knob Ø (A) | Overall length (D) | Coolant hole Ø (J) | Seal |
|---|---|---|---|---|---|---|
| PSI4B4001RO | 45° | M16 | 17 mm | 60 mm | – | Seal ring |
| PSBT4016MP | 45° | M16 | 17 mm | 57.15 mm | – | – |
| PSI4B4001RCO | 45° | M16 | 17 mm | 60 mm | 4 mm | Seal ring |
| PSI4B4001COOT | 45° | M16 | 17 mm | 60 mm | 4 mm | Seal ring, O-ring |
| PSBT4016MCP | 45° | M16 | 17 mm | 57.15 mm | 4.4 mm | – |
| PSI3B4002 | 60° | M16 | 17 mm | 60 mm | – | – |
| PSBT4067MP | 60° | M16 | 17 mm | 57.15 mm | – | – |
| PSI3B4002C | 60° | M16 | 17 mm | 60 mm | 4 mm | – |
| PSBT4067MCP | 60° | M16 | 17 mm | 57.15 mm | 4.4 mm | – |
| PSI5B4011 | 90° | M16 | 17 mm | 60 mm | – | – |
| PSBT4063MP | 90° | M16 | 17 mm | 57.15 mm | – | – |
| PSI5B4011C | 90° | M16 | 17 mm | 60 mm | 4 mm | – |
| PSBT4063MCP | 90° | M16 | 17 mm | 57.15 mm | 4.4 mm | – |
MG MEGA Strength: 2 BT40 pull studs
| Ordering code | Head angle (θ) | Thread (TH) | Knob Ø (A) | Overall length (D) | Coolant hole Ø (J) | Seal |
|---|---|---|---|---|---|---|
| 4001RO-M106 | 45° | M16 | 17 mm | 60 mm | – | Seal ring |
| 4001RCO-M106 | 45° | M16 | 17 mm | 60 mm | 4 mm | Seal ring |
JIS B6339: 7 BT40 pull studs
| Ordering code | Head angle (θ) | Thread (TH) | Knob Ø (A) | Overall length (D) | Coolant hole Ø (J) | Seal |
|---|---|---|---|---|---|---|
| PSJIS4013 | 15° | M16 | 17 mm | 54 mm | – | – |
| PSJIS4013O | 15° | M16 | 17 mm | 54 mm | – | Seal ring |
| PSJIS4013C | 15° | M16 | 17 mm | 54 mm | 7 mm | – |
| PSJIS4013CO | 15° | M16 | 17 mm | 54 mm | 7 mm | Seal ring |
| PSJIS4013COOT | 15° | M16 | 17 mm | 54 mm | 7 mm | Seal ring, O-ring |
| PSJIS4013CI | 15° | 5/8" | 16.28 mm | 51.15 mm | 7 mm | – |
| PSJIS4013COI | 15° | 5/8" | 16.28 mm | 51.15 mm | 7 mm | Seal ring |
How do I choose a BT40 pull stud?
Taper. Check that the tool holder has a BT40 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), MG MEGA Strength or JIS B6339.
Head angle. MAS-BT 45°, 60° or 90°, MG MEGA Strength 45° and JIS B6339 15°. Check that your drawbar gripper takes the head angle you order.
Thread. The BT40 shank table gives M16 for the holder's pull-stud thread. The 5/8" version is for holders made with that thread.
Coolant. For through-spindle coolant, order a stud with a coolant hole (J, Ø4–7 mm); seal ring and O-ring versions seal it.
Questions about BT40 pull studs
What thread does a BT40 pull stud have?
BT40 pull studs from PTP come with M16 (20 codes) and 5/8" (PSJIS4013CI, PSJIS4013COI) threads. The BT40 shank table gives M16 for the holder thread.
Which head angles are there for BT40 pull studs?
45° (MAS-BT and MG MEGA Strength), 60° (MAS-BT), 90° (MAS-BT) and 15° (JIS B6339). Order the head angle your drawbar gripper takes.
MAS-BT pull studs MG MEGA Strength pull studs JIS B6339 pull studs
Are there coolant-through BT40 pull studs?
Yes: 13 of the 22 BT40 codes have a coolant hole, Ø4–7 mm (J); 9 have a seal ring and 2 have an O-ring. The table lists the coolant hole of every code.