Match the thread diameter (M10, M12, M14, or M16) to your existing threaded hole or insert. For length, measure the total clamping depth and add the thickness of any washers or spacers. As a general rule, the bolt should engage at least 1.5× its diameter in thread depth — for example, an M12 bolt should engage at least 18mm (≈11/16") of thread. Lengths in this listing range from 100mm (≈3.9") to 200mm (≈7.9").

These thumb screws are generally made from carbon steel with a protective surface finish — typically zinc plating or black oxide coating — to resist corrosion under normal indoor workshop conditions. Please contact us to confirm the exact finish if your application has specific requirements.

These bolts are suitable for light outdoor or occasional moisture exposure, but are not designed for prolonged outdoor, marine, or high-humidity environments. For outdoor use, we recommend applying a corrosion-inhibiting lubricant. Contact us to confirm suitability for your specific conditions.

These are metric coarse-thread bolts following ISO standards. Thread pitches are typically: M10 × 1.5mm, M12 × 1.75mm, M14 × 2.0mm, M16 × 2.0mm. They are not compatible with UNC or UNF imperial threads. Always verify your existing thread standard before ordering.

These star knob bolts are designed for hand-tightening in jigs, fixtures, and light machinery — not for high-torque structural connections. Clamping force depends on thread size and the hand torque applied. In most cases, they provide sufficient holding force for woodworking jigs, adjustable stops, and machine guards. For heavy-load or vibration-critical applications, contact us to confirm suitability.

No tools are required. The star-shaped knob provides multiple grip points for comfortable hand-tightening and loosening. This makes them ideal for applications where frequent adjustments are needed — such as woodworking jigs, camera rigs, or machine guards — without reaching for a wrench each time.

The "M16 Nuts" variant is a standalone M16 star-shaped hand knob nut, sold separately from the bolts. It can be used as a locking nut or paired with a standard M16 threaded rod or bolt to create a complete tool-free clamping assembly.

In most cases, yes — these metric thumb screws are compatible with T-nuts and threaded inserts commonly used in woodworking benches and CNC router tables, provided the T-nut thread matches the bolt size (M10, M12, M14, or M16). Always verify the thread size of your T-track hardware before ordering.