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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.
Flange O-Ring Included—Knobs with flange O-rings block external coolant from entering your machine spindle. Match the O-ring placement and style to your current setup to ensure optimal sealing and performance.
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 | Pilot Dia. | Collar Dia. | Head-to-Flange Lg. | Flange Thk. | Torque Range, ft·lbf | O-Rings Included | Features | Mfr. | Mfr. Model No. | Mfr. Equiv. Model No. | Specs. Met | JIS Specification | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CAT 50 Machine Taper | |||||||||||||||||||
1"-8 | |||||||||||||||||||
| 15° | 1.344" | 1.1" | 0.39" | — | 0.82" | 1" | 0.275" | 75 to 90 | — | — | T.J. Davies | PSC-271X15 | 21100-C, C50-1500H | ISO 7388-3 | JIS B 6339 | 9499N15 | 000000 | ||
| 15° | 1.344" | 1.102" | 0.39" | — | 0.82" | 0.984" | 0.197" | 75 to 90 | — | — | T.J. Davies | PSC-270X15 | 711-45, 5030TRKC, 21008-15C, 71145, HP-711-45, RS6E-0114-C | ISO 7388-3 | JIS B 6339 | 9499N14 | 00000 | ||
| 30° | 1.772" | 0.904" | 0.232" | 1.023" | 0.825" | 1.376" | 0.394" | 75 to 90 | Flange O-Ring | Ground Face | T.J. Davies | PSCG-535X60 | C50-OKUMA-OH | ISO 7388-3 | JIS B 6339 | 9499N42 | 00000 | ||
| 30° | 1.772" | 0.904" | 0.232" | 1.023" | 0.825" | 1.384" | 0.394" | 75 to 90 | Flange O-Ring | — | T.J. Davies | PSC-535X60 | 327-49, 21133-C, 32749, C50 MAKINO, RS6E-0242-H | ISO 7388-3 | JIS B 6339 | 9499N41 | 00000 | ||
| 30° | 1.772" | 0.906" | 0.236" | 1.024" | 1.024" | 1.378" | 0.39" | 85 to 110 | Flange O-Ring | Ground Face | Lyndex Nikken | PS-B61 | — | — | JIS B 6339 | 4403N39 | 00000 | ||
| 30° | 1.78" | 0.906" | 0.236" | — | 0.827" | 1.386" | 0.394" | 85 to 110 | — | Ground Face | Lyndex Nikken | C50-6000(H)-EU | — | ASME B5.50 | — | 9499N13 | 00000 | ||
| 45° | 1" | 1.14" | 0.39" | — | 0.825" | 0.7" | 0.2" | 75 to 90 | — | — | T.J. Davies | PSC-273 | 21142-C, HPS-C50-MAZAK-C | ASME B5.50, ISO 7388-3 | JIS B 6339 | 9499N16 | 00000 | ||
| 45° | 1" | 1.14" | 0.39" | 1.03" | 0.825" | 0.7" | 0.2" | 75 to 90 | Head O-Ring in Coolant Hole | — | T.J. Davies | PSC-274 | 312-46, 31246, HPS-C50-MAZAK-COF, HPS-G43, M50TRK, PYN50C, RS6E-0204-C | ASME B5.50, ISO 7388-3 | JIS B 6339 | 9499N17 | 00000 | ||
| 45° | 1" | 1.14" | 0.433" | — | 0.82" | 0.7" | 0.2" | 75 to 90 | Head O-Ring in Coolant Hole | — | T.J. Davies | PSCO-275 | 50TRKC-OR, 719-46, 71946 | ASME B5.50, ISO 7388-3 | JIS B 6339 | 9499N19 | 00000 | ||
| 45° | 1" | 1.14" | 0.453" | — | 0.82" | 0.7" | 0.2" | 75 to 90 | — | — | T.J. Davies | PSC-275 | 50TRK, 111-44, 11144, 21005-C, C50-STDH, HPS-C50-ANSI-C, HPS-D92, RC6E-0001 | ASME B5.50, ISO 7388-3 | JIS B 6339 | 9499N18 | 00000 | ||
| 45° | 1.778" | 0.904" | 0.264" | 0.985" | 0.825" | 1.384" | 0.394" | 75 to 90 | Flange O-Ring | — | T.J. Davies | PSC-535X45 | 21132-C, MAKO50TRK-MF, RS6E-0232-H | ISO 7388-3 | JIS B 6339 | 9499N37 | 00000 | ||
| 45° | 1.778" | 0.904" | 0.264" | 0.985" | 0.825" | 1.384" | 0.394" | 75 to 90 | Flange O-Ring | Ground Face | T.J. Davies | PSCG-535X45 | — | ISO 7388-3 | JIS B 6339 | 9499N38 | 00000 | ||
| 45° | 1.778" | 0.904" | 0.264" | 1.03" | 0.825" | 1.384" | 0.394" | 75 to 90 | Flange O-Ring, Head O-Ring in Coolant Hole | — | T.J. Davies | PSCO-535X45 | — | ISO 7388-3 | JIS B 6339 | 9499N39 | 00000 | ||
| 45° | 1.778" | 0.904" | 0.309" | 1.03" | 0.825" | 1.384" | 0.394" | 75 to 90 | — | — | T.J. Davies | PSC-536X45 | 316-45, 5005TRKC, 21109-C, 31645, C50-4500 H, HPS-54C, HPS-C50-MAS-45 C, P50T-1CH, RB6E-0001-C | ISO 7388-3 | JIS B 6339 | 9499N44 | 00000 | ||
| 45° | 1.78" | 0.904" | 0.232" | 1.03" | 0.82" | 1.384" | 0.394" | 75 to 90 | Head O-Ring in Coolant Hole | — | T.J. Davies | PSCO-536X45 | 329-45, 32945 | ISO 7388-3 | JIS B 6339 | 9499N45 | 00000 | ||
| 45° | 1.78" | 0.906" | 0.236" | — | 0.827" | 1.386" | 0.39" | 85 to 110 | — | Ground Face | Lyndex Nikken | C50-4500(H)-EU | — | ASME B5.50 | — | 4403N29 | 00000 | ||
| 90° | 1.778" | 0.904" | 0.309" | 1.03" | 0.825" | 1.384" | 0.394" | 75 to 90 | — | — | T.J. Davies | PSC-536X90 | 342-18B, 5001TRKC, 21111-C, C50-9000 H, HPS-C50-MAS-90 C, HPS-O19C, RB6E-0003-C | ISO 7388-3 | JIS B 6339 | 9499N46 | 00000 | ||
| 90° | 1.778" | 0.904" | 0.312" | — | 0.83" | 1.384" | 0.394" | 75 to 90 | Flange O-Ring, Head O-Ring in Coolant Hole | — | T.J. Davies | PSC-540X90 | C50-9000 MORI EU | ISO 7388-3 | JIS B 6339 | 9499N47 | 00000 | ||
| 90° | 1.778" | 0.904" | 0.315" | 1.03" | 0.825" | 1.384" | 0.394" | 75 to 90 | Flange O-Ring, Head O-Ring in Coolant Hole | — | T.J. Davies | PSCO-535X90 | 342-75, 34275, C50-9000-MORI-EU, POM50CH1 | ISO 7388-3 | JIS B 6339 | 9499N43 | 00000 | ||
CAT Taper Retention Knobs
 |
 |  |
Knob | Knob with Pilot |
Lock tool holders in place on CNC machines with CAT taper spindles when milling, drilling, and routing. All meet industrial standards for tensile and shear strength. These knobs are also known as pull studs. 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. Use a torque wrench with a retention knob socket or a changeable-head torque wrench to tighten them.
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.
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. | Pilot Dia. | Collar Dia. | Head-to-Flange Lg. | Flange Thk. | Torque Range, ft·lbf | Mfr. | Mfr. Model No. | Mfr. Equiv. Model No. | Specs. Met | JIS Specification | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CAT 50 Machine Taper | ||||||||||||||||
1"-8 | ||||||||||||||||
| 15° | 1.344" | 1.1" | — | 0.82" | 1" | 0.275" | 75 to 90 | T.J. Davies | PS-271X15 | 21100, C50-1500 | ISO 7388-3 | JIS B 6339 | 9496N12 | 000000 | ||
| 15° | 1.344" | 1.102" | — | 0.82" | 0.984" | 0.197" | 75 to 90 | T.J. Davies | PS-270X15 | 711-47, 5030TRK, 21008-15, 71147, RS6E-0114 | ISO 7388-3 | JIS B 6339 | 9496N11 | 00000 | ||
| 45° | 1" | 1.14" | — | 0.82" | 0.7" | 0.2" | 75 to 90 | T.J. Davies | PS-275 | 50NTRK, 111-46, 11146, 21005, C50-STD, HPS-C50-ANSI, RC6E-0002 | ISO 7388-3 | JIS B 6339 | 9496N13 | 00000 | ||
| 45° | 1.778" | 0.904" | 1.03" | 0.825" | 1.384" | 0.394" | 75 to 90 | T.J. Davies | PS-536X45 | 311-18, 5005TRK, 21109, 31118, C50-4500, HPS-C50-MAS-45, RB6E-0001 | ISO 7388-3 | JIS B 6339 | 9496N23 | 00000 | ||
| 90° | 1.778" | 0.904" | 1.03" | 0.825" | 1.384" | 0.394" | 75 to 90 | T.J. Davies | PS-536X90 | 311-18B, 5001TRK, 21111, 31118B, C50-9000, HPS-C50-MAS-90, HPS-O19, PS-09, RB6E-0003 | ISO 7388-3 | JIS B 6339 | 9496N24 | 00000 | ||
