12.9 Grub Screws | Spring Ball Plunger Set Screw | M2.5-M12 Hex Socket

These grub screws have a spring-loaded ball tip. They help with precise positioning and indexing. Made from 12.9 grade alloy steel, these ball plungers give consistent pressure. The hex socket design ...
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Questions about this product
- What are these ball plunger grub screws actually used for?
- These are mainly for indexing and positioning parts in jigs, fixtures, and machinery. The spring-loaded ball clicks into a detent or groove to hold a component in a specific position, then retracts when you apply force to move it.
- What material are these made from and what's the strength rating?
- They are made from Grade 12.9 carbon steel, which is a high-tensile alloy. This gives them very good strength and wear resistance, making them suitable for demanding industrial applications where reliable positioning is key.
- How do I know what size to order? What does the 'M6' or 'M8' mean?
- The 'M' number refers to the metric thread diameter in millimetres, so an M6 screw has a 6mm thread. You need to match this to the tapped hole in your workpiece. We stock a range from M2.5 up to M12 to fit most common jobs.
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