⭐ Star Bakelite Thumb Screws – Threaded Clamping Hand Knob Bolts (M3 M4 M5 M6 M8 M10 M12)
You need a comfortable, high‑grip knob for frequent adjustments on machinery, jigs, or DIY equipment – without reaching for a wrench every time. These star‑shaped hand knobs are made from durable black Bakelite (thermosetting plastic) with a stainless steel threaded insert. The five‑lobe star design gives you excellent leverage and a secure grip, even with oily hands. Perfect for tool‑less clamping on machine tools, 3D printers, camera rigs, and woodworking jigs. Available in metric thread sizes from M3 up to M12. Fully threaded (where applicable) with corrosion‑resistant stainless steel studs. Just spin them on by hand – fast, strong, and comfortable.
✨ Key Features – Star Bakelite Clamping Knobs
- ⭐ Five‑star ergonomic handle – Provides multiple grip points for easy hand tightening and loosening, even in tight spaces.
- 🛡️ Bakelite (phenolic) plastic body – Heat‑resistant, chemically stable, and electrically insulating. Won’t scratch workpieces.
- 🔩 Stainless steel threaded insert – Corrosion‑resistant and strong. Fully or partially threaded depending on size.
- 📏 Wide metric range M3 to M12 – Covers everything from small electronic equipment to heavy machinery clamps.
- 🔧 Tool‑less operation – Tighten and release by hand – no spanners or screwdrivers needed. Ideal for frequent adjustments.
- 🏭 Widely used – Machine tools, 3D printers, camera tripods, woodworking jigs, fitness equipment, and industrial fixtures.
📏 Specifications – Star Bakelite Thumb Screws (Metric Threads)
| Thread Size (M) |
Thread Pitch (mm) |
Handle Diameter (approx.) |
Handle Height (approx.) |
Stud Length (mm, under head) * |
Material |
| 📐 Stud length measured from underside of handle to tip. Select exact size and length from dropdown. |
| M3 |
0.5 |
~24 mm |
~15 mm |
Select from dropdown (typical range 10–50mm) |
Bakelite (handle) + stainless steel (insert) |
| M4 |
0.7 |
~30 mm |
~18 mm |
| M5 |
0.8 |
~35 mm |
~20 mm |
| M6 |
1.0 |
~40 mm |
~22 mm |
| M8 |
1.25 |
~50 mm |
~25 mm |
| M10 |
1.5 |
~63 mm |
~30 mm |
| M12 |
1.75 |
~75 mm |
~35 mm |
* Stud lengths vary – please select from dropdown. Head dimensions are approximate; actual sizes may vary slightly by manufacturer.
🛠️ Why Choose Star‑Handle Thumb Screws?
| Benefit |
Description |
| High gripping comfort |
Star shape fits the natural curve of your hand – provides excellent torque without slipping. |
| Corrosion resistant |
Stainless steel threaded insert won’t rust, even in damp workshops or outdoor use. |
| Heat & chemical resistant |
Bakelite handles withstand higher temperatures and resist most solvents and oils. |
| Non‑conductive handle |
Electrical insulation makes them safe for adjusting live equipment (where the stud is isolated). |
❓ Frequently Asked Questions – Star Bakelite Thumb Screws
1. How do I measure the length of these star thumb screws?
Length is measured from the underside of the handle (where the plastic meets the metal stud) to the tip of the threaded shaft. The handle itself is NOT included. For example, an “M6 x 20mm” screw has a 20mm long threaded stud under the handle. Select your required stud length from the dropdown.
2. Are the stainless steel studs fully threaded?
Most lengths are fully threaded from under the head to the tip. For longer studs (e.g., 50mm+ on larger diameters), some may have a partial thread near the handle. Check the product images or dropdown for exact configuration.
3. Can I use these knobs in high‑temperature environments?
Bakelite is a thermosetting plastic that can withstand continuous temperatures up to ~120‑150°C (248‑302°F) without softening. It is much more heat‑resistant than common thermoplastics like nylon or ABS.
4. Do I need a nut or washer with these thumb screws?
If your equipment has a pre‑tapped hole (e.g., a threaded insert in a machine), no nut is needed. For plain holes, use a standard metric nut of the same thread size. A flat washer is optional for load distribution.
5. Are these knobs available in other colours?
The standard colour is black Bakelite. For other colours (red, blue, etc.), please contact us – they may be available on request for bulk orders.
6. Can I use these for clamping on a drill press or milling machine?
Absolutely – star knobs are commonly used for tool‑less clamping on machine vises, fence stops, and height adjustments. Choose the thread size and stud length that fits your machine’s threaded hole.
