Pull studs by taper
CAT50 Pull Studs (Retention Knobs) – 45° Head, 1" Thread
CAT50 pull studs (retention knobs) screw into the back of a CAT50 tool holder (shank to ANSI/ASME B5.50, V-flange) so the machine's drawbar can pull it into the spindle. PTP makes 3 CAT50 pull studs: ANSI/ASME B5.50 with a 45° head, with a 1" 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 3 CAT50 pull studs
Grouped by standard, then by head angle. Each ordering code opens its own page with the drawing and every dimension (mm).
ANSI/ASME B5.50: 3 CAT50 pull studs
| Ordering code | Head angle (θ) | Thread (TH) | Knob Ø (A) | Overall length (D) | Coolant hole Ø (J) | Seal |
|---|---|---|---|---|---|---|
| PSAN5005P | 45° | 1" | 26.17 mm | 58.42 mm | – | – |
| PSAN5005CP | 45° | 1" | 26.17 mm | 58.42 mm | 11.88 mm | – |
| PSAN5005CPOC | 45° | 1" | 26.17 mm | 58.42 mm | 11.88 mm | Seal ring, O-ring |
How do I choose a CAT50 pull stud?
Taper. Check that the tool holder has a CAT50 shank to ANSI/ASME B5.50, V-flange. Its dimensions are on the CAT (ANSI/ASME B5.50) shank page.
Standard. Pick the pull stud type your machine's drawbar is built for: ANSI/ASME B5.50.
Head angle. ANSI/ASME B5.50 45°. Check that your drawbar gripper takes the head angle you order.
Thread. The CAT50 shank table gives 1"-8 UNC for the holder's pull-stud thread.
Coolant. For through-spindle coolant, order a stud with a coolant hole (J, Ø11.88 mm); seal ring and O-ring versions seal it.
Questions about CAT50 pull studs
What thread does a CAT50 pull stud have?
All 3 CAT50 pull studs from PTP have a 1" thread. The CAT50 shank table gives 1"-8 UNC for the holder thread.
Which head angles are there for CAT50 pull studs?
45° (ANSI/ASME B5.50). Order the head angle your drawbar gripper takes.
Are there coolant-through CAT50 pull studs?
Yes: 2 of the 3 CAT50 codes have a coolant hole, Ø11.88 mm (J); 1 has a seal ring and 1 has an O-ring. The table lists the coolant hole of every code.