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CNC Tooling Guides: Pull Studs, Tool Holders and ER Collets
Plain answers for choosing CNC tooling, taken from the PTP catalogue tables: pull studs and their standards, the ISO 7388-3 forms, the shank systems, the tool holder types and the ER collet sizes. Each guide links to the products and to every ordering code.
Last updated 29 October 2026
Guides
- Pull studs explained: types, standards and selectionWhat a pull stud does, the standards side by side, head angles, threads, coolant options and how PTP tests every stud.
- ISO 7388-3 pull stud forms JD, JF, AD, AF, UD and UFWhat the ISO 7388-3 letters mean and how they map to MAS-BT, DIN 69872, ANSI/ASME B5.50 and the old IS 11173-2 types.
- BT vs SK vs CAT vs HSK tool holdersStandards, gauge and flange diameters, pull-stud threads and units of the five shank systems, from the PTP shank tables.
- ER, shrink fit, hydraulic and Weldon holders comparedHow each holder type clamps the tool, which shanks it takes, its run-out and balance, and what else it needs.
- ER collet size chart, ER8 to ER50Clamping range, collet steps and sets, nut threads and sealing rings for every ER size PTP makes.
Tools and reference
- Find your pull studPick the taper, standard, thread, head angle and coolant type; get the PTP ordering codes.
- Build your Clamprite kitConfigure a Clamprite drawbar force gauge kit and get its part number.
- Shank dimensionsBT, SK, CAT, HSK and DIN 2080 shank tables with drawings.
- Technical referenceTaper dimensions, AT3 / AT4 cone tolerances and balance grades.
- Full catalogueEvery PTP ordering code, each with its own page.