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Retention Knobs - Pull Studs
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  • Retention Knobs, also called Pull Studs are the link between the machine drawbar and the toolholder.
  • Pulling forces can reach up to 1200 lbs for BT30, 2300 lbs for 40 taper, and up to 5000 lbs for 50 taper
  • Our retention knobs are made in the USA by MariTool from H-13 tool steel. H-13 is tougher and harder than 8620, 9310 and 4140 alloys that are commonly used by other manufacturers
  • All of our Retention Knobs have pilot diameters that help improve concentricity
  • Retention Knobs do not have an infinite life
  • For current recommended torque specs please click this link
  • For other commonly asked questions about retention knobs please click this link
  • For retention knob sockets and wrenches please click this link

CLICK HERE to find the right pull stud for your machine.
Pull Stud Machine Guide
Pull Stud Machine Guide		 CAT40 Pull Studs - Retention Knobs
CAT40 Pull Studs - Retention Knobs		 CAT50 Pull Studs - Retention Knobs
CAT50 Pull Studs - Retention Knobs
BT40 Pull Studs - Retention Knobs
BT40 Pull Studs - Retention Knobs		 BT30 Pull Studs - Retention Knobs
BT30 Pull Studs - Retention Knobs		 ISO30 Pull Studs - Retention Knobs
ISO30 Pull Studs - Retention Knobs
Pull Stud Sockets - Retention Knob Sockets
Pull Stud Sockets - Retention Knob Sockets		 BT15 15T and ATC15 Retention Knobs
BT15 15T and ATC15 Retention Knobs