A pull stud is the interface between a workpiece, pallet, fixture or workholding component and a zero point clamping system. It is secured in the clamping receiver so the fixture or pallet can be located and clamped repeatedly. Because the stud geometry must match the receiver, choosing a pull stud is not simply a matter of selecting a thread size.
For zero point workholding, select the pull stud by system compatibility first, then verify thread, dimensions and the intended locating or orientation function. M8 and M10 describe the mounting thread, but they do not by themselves guarantee interchangeability.
What Is a Pull Stud?
A pull stud is a mechanical interface used by a zero point clamping receiver to locate and pull a pallet, fixture or other workholding component into a defined position. In a quick-change setup, the stud remains attached to the component while the receiver provides the clamping action.
The practical value is the interface between repeatable location and fast changeover. Instead of rebuilding the fixture position each time, the same receiver-and-stud geometry can be used as part of a standardized workholding setup.
Types of Zero Point Pull Studs
Pull studs are not one universal geometry. The correct type depends on the receiver design and the function required at each locating point.
Standard Pull Studs
Standard pull studs provide the primary interface for clamping and locating a compatible pallet or fixture in a zero point receiver. They should be selected according to the receiver family, stud geometry and mounting specification.
Timing Studs
A timing stud is used where orientation or rotational alignment is part of the fixture interface. In applications where multiple locating points are used, the timing function can help establish a defined orientation rather than relying only on the main clamping interface.
Clearance Studs
Clearance studs are used where the installation requires clearance or a secondary interface rather than the same primary locating function as the main pull stud. The exact function depends on the zero point system design, so the manufacturer's receiver and stud specification should be checked before selection.
Pull Stud vs Timing Stud: What's the Difference?
| Feature | Pull Stud | Timing Stud |
|---|---|---|
| Primary purpose | Clamping and locating a compatible component | Orientation or rotational alignment |
| Typical role | Main zero point interface | Secondary/orientation interface where required |
| Selection priority | Receiver compatibility, geometry and thread | Orientation function plus receiver compatibility |
| Interchangeability | Must match the receiver design | Must match the timing interface design |
The terminology can vary between zero point manufacturers. For that reason, the safest approach is to match the stud to the receiver specification rather than assuming that two parts are interchangeable because they have the same thread.
Zero Point Pull Stud Sizes and Dimensions
Thread size is one of the first specifications to check, but it is only one part of compatibility. Stud diameter, overall length, locating geometry and receiver engagement also matter.
The ZPP product specifications identify the TS52 and PM52 pull studs as M8 products, while the TS96 and PM96 pull studs use M10 mounting threads. The applicable series should be checked before ordering.
M8 Pull Stud Dimensions
ZPP offers two M8 pull stud configurations. The TS52 Pull Stud Series – M8 is specified as D16 × 24.56 mm for the TS52 Series. The PM52 Pull Stud Series – M8 is specified as D21.8 × 29 mm and is applicable to the PM52 Series, including TS52, PM52 and AP52.
M10 Pull Stud Dimensions
For the Type 96 interface, ZPP offers the TS96 Pull Stud Series – M10, specified as D20 × 29 mm for the TS96 Series. The PM96 Pull Stud Series – M10 is specified as D21.9 × 29 mm and is applicable to the PM96 Series, including TS96, PM96 and AP96.
How to Choose the Right Zero Point Pull Stud
1. Identify the receiving zero point system
Start with the zero point module or chuck that will receive the stud. This is the most important compatibility check.
2. Confirm the mounting thread
Check whether the application calls for M8, M10 or another specified thread. Do not use thread size alone as proof of compatibility.
3. Verify the stud geometry and dimensions
Confirm the diameter, overall length, locating surfaces and engagement geometry against the receiver specification.
4. Determine whether orientation is required
If the fixture needs a defined rotational orientation, check whether a timing stud or another orientation feature is required by the system.
5. Match the stud to the application
Consider the pallet, fixture, vise, tombstone or 5-axis workholding configuration in which the stud will be installed. Standardizing the interface across compatible fixtures can simplify quick-change workflows.
Pull Studs in a Zero Point Clamping System
A pull stud works as part of a complete workholding interface rather than as an isolated component. In a typical quick-change setup, the fixture carries the stud, the receiver establishes the locating interface, and the clamping mechanism secures the assembly.
For a broader explanation of how these components fit into a modular setup, see the ZPP Zero Point Clamping System.
TS96 Pull Stud Series – M10
Explore the ZPP TS96 pull stud for TS96 Series zero point workholding applications.
Can Pull Studs From Different Zero Point Systems Be Mixed?
Not necessarily. Two pull studs may use the same nominal thread and still have different locating or clamping geometry. Compatibility should be confirmed from the receiver and stud specifications, including the thread, diameter, length and interface geometry.
This is especially important when building a modular workholding system. A standardized interface is valuable only when every mating component is designed for that interface.
FAQ
What is a pull stud?
What is the difference between a pull stud and a timing stud?
What size pull stud do I need?
Are M8 and M10 pull studs interchangeable?
Can pull studs from different manufacturers be mixed?
Conclusion
Pull studs are a small component with a critical role in zero point workholding. The right selection starts with the receiver system, then moves through thread size, dimensions, locating geometry and orientation requirements. For ZPP applications, the TS52 and PM52 ranges provide M8 options, while the TS96 and PM96 ranges provide M10 options with their specified dimensions and compatible series.
If you are building or standardizing a modular CNC workholding setup, review the receiver and stud specifications together before selecting replacement or additional components.
Explore ZPP Pull Studs
Compare the current TS52, PM52, TS96 and PM96 pull stud configurations for your zero point clamping setup.