Top Drawer M3x4mm Ball Plunger Grub Screws Heavy Duty Alloy Steel Hex Socket Springs For Precision Locking And Indexing Durable 20 Piece Assortment Built Dang Tough For Any Workshop Rig Or Gearbox Setup

Heavy duty M3 alloy steel ball plunger screws pack of 20
✔️ Thread size M3 diameter 3.0 mm pitch 0.5 mm overall length 4.0 mm

A spring loaded ball plunger grub screw applies steady radial force for precise locking and indexing tasks. You usually mount these hex socket fasteners inside gearboxes, machinery housings, jigs, or DIY workshops to hold components securely in place.

✅ Class 12 9 alloy steel construction for heavy duty durability
✅ Hex socket drive accepts standard Allen wrenches for secure installation
✅ Precise M3 threading mates cleanly with matching tapped holes
✅ Four millimeter protruding ball tip ensures reliable grip and release
✅ Set includes twenty individual plungers for repeated replacement or bulk builds

💡 What are spring loaded ball plungers used for?

These indexed fasteners apply steady radial pressure to pin components in motion.

- They serve as handy detent stops for sliding fixtures and hinge adjustments

- Machinists depend on them for precise linear slide unit positioning

- Builders install them to lock custom gearbox linkages without backlash

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