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CAT Taper Retention Knobs with Coolant Hole
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Knob | Knob with Pilot |
Lock tool holders in place on CNC machines with a through-spindle coolant (TSC) system. They fit machines with a CAT taper spindle. All meet industrial standards for tensile and shear strength. Also known as pull studs. Use a torque wrench with a retention knob socket or a changeable-head torque wrench to tighten them.
To ensure compatibility with your machine, compare the features on these knobs, such as the location of O-ring seals and the pilot design, to those on your current knob.
Knobs with a pilot ensure precise alignment between the tool holder and spindle, reducing vibration and runout. To upgrade a standard knob to one with a pilot, confirm that the pilot diameter is small enough to fit in your tool holder without touching the inner walls where the knob seats.
Ground Face—Knobs with a ground face have a tighter seal than those without one, which helps prevent coolant leaks.
Grip Angle—Grip angle is the sloped part of the knob that the machine grips to secure the tool holder. A 15˚ grip angle is sometimes referred to as a 75˚ grip angle. A 30˚ grip angle is sometimes referred to as a 60˚ grip angle.
Grip Angle | Projection | Head Dia. | Coolant Hole Diameter | Collar Dia. | Head-to-Flange Lg. | Flange Thk. | Torque Range, ft·lbf | Features | Mfr. | Mfr. Model No. | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CAT 40 Machine Taper | |||||||||||||||
5/8"-11 | |||||||||||||||
| 45° | 0.64" | 0.74" | 0.276" | 0.512" | 0.433" | 0.12" | 44 to 59 | Ground Face | Lyndex Nikken | C40-STD | ASME B5.50 | 4403N24 | 000000 | ||
Torque Wrenches for CNC Retention Knobs
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Prevent damage to CNC spindles and tool holders when installing knobs. These wrenches torque retention knobs to manufacturer specs to avoid overtightening that can bend or misalign your setup. Set your torque and the wrench signals when it’s reached with an audible click and an impulse in the grip. All come with a calibration certificate, which includes test measurements that confirm accuracy.
For Machine Taper No. | Drive Size | Torque | Graduations | Opening Angle | Clockwise Accuracy | Mfr. | For Mfr. Model No. | Overall Lg. | Specs. Met | Certificate Type | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Round Open End Heads—Nonratcheting | ||||||||||||||
ft·lbf, N-m | ||||||||||||||
| CAT 40 BT 40 | 3/4" | 30 ft·lbf to 150 ft·lbf 47 N-m to 197 N-m | 1 ft·lbf 1.4 N-m | Straight | ±4% | Lyndex Nikken | C40-1500 C40-1500(R) C40-1500-MORI C40-STD C40S-4500 C40S-4500(H) C40S-6000 PS-B64-1 B40-1500 B40-1500(R) B40-1500-MORI B40-4500 B40-4500(H) B40-FADAL | 21 1/4" | ASME B107.14M, ISO 6789 | Calibration Certificate with Test Data Traceable to DIN | 6643N2 | 0000000 | ||
