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When you need to make quick adjustments on a jig, fixture, or machine table without reaching for a wrench, loose or awkward fasteners slow you down. These plastic star knobs clamping bolts are designed for makers, woodworkers, machinists, and workshop builders who need reliable hand-tightened clamping in tight spaces or repetitive setups.
Each unit pairs a black ABS plastic star-shaped knob with a zinc-plated steel bolt. Thread sizes available are M8 and M10, with bolt lengths ranging from 16mm to 70mm (~0.63" to 2.76"). The flange diameter is either 39mm (~1.54") or 49mm (~1.93"), giving you two footprint options to match your clamping surface.
Typical use cases include securing fence stops on router tables, locking depth adjustments on drill press jigs, clamping workholding fixtures on CNC beds, and adjusting machine guards or guards on metalworking equipment ā all without tools.
The five-point star profile gives your fingers a secure grip for fast, confident tightening and loosening without any tools ā ideal for repetitive adjustments.
The integrated bolt is zinc-plated for corrosion resistance, providing a durable metal thread that holds up to repeated clamping cycles in workshop environments.
Choose D39mm (~1.54") or D49mm (~1.93") flange diameter to match your clamping surface area requirements and load distribution needs.
Available in M8 and M10 thread sizes with bolt lengths from 16mm to 70mm, covering the majority of standard jig and fixture clamping depths.
The knob body is molded in black ABS plastic ā lightweight, impact-resistant, and resistant to common workshop oils and coolants.
Fully metric-spec fasteners compatible with standard workshop machinery, jigs, and fixtures. No adapters or conversions needed for metric setups.
| Type | Star Knobs Clamping Bolts (Thumb Screws) |
|---|---|
| Knob Material | ABS Plastic |
| Bolt Material | Steel |
| Finish | Zinc Plated (bolt); Black (knob) |
| Head Style | Plastic Star (5-point) |
| Thread Size | M8 / M10 |
| Bolt Length Range | 16mm ā 70mm (approx. 0.63" ā 2.76") |
| Flange Diameter | D39mm (~1.54") / D49mm (~1.93") |
| System of Measurement | Metric |
| Drive Style | Hand-tightened (no tool required) |
| Quantity per Order | See variant options |
| Weight | See variant options |
Measure the total clamping depth ā the thickness of the material being clamped plus any spacers or washers. Choose a bolt length that passes fully through the clamped material with enough thread engagement (typically at least 1Ć the thread diameter) remaining in the receiving hole. For M8, that means at least 8mm of thread engagement; for M10, at least 10mm.
The flange diameter refers to the outer diameter of the star knob body. A larger D49mm knob distributes clamping load over a wider area, which is useful when clamping softer materials like wood or plastic to avoid surface indentation. The D39mm is more compact and suits tighter spaces or metal-to-metal clamping where surface area is less critical.
These star knobs are designed for hand-tightened clamping loads typical of jigs, fixtures, and machine adjustments. The zinc-plated steel bolt provides solid thread strength. However, they are not intended as a replacement for torqued structural fasteners. For applications requiring high clamping force, supplement with a wrench-tightened bolt and use these for quick-release adjustment points.
The steel bolts feature a zinc plating that provides moderate corrosion resistance suitable for typical indoor workshop conditions. For prolonged exposure to moisture, humidity, or outdoor environments, consider applying a light coat of machine oil to the bolt threads. For fully corrosion-proof requirements, stainless steel alternatives would be more appropriate.
These knobs are compatible with any standard metric M8 or M10 threaded hole. Most router table fences, drill press depth stops, and CNC workholding fixtures use M8 or M10 metric threads. Confirm the thread size and pitch of your existing holes before ordering. Standard metric coarse pitch for M8 is 1.25mm and for M10 is 1.5mm ā these bolts follow standard metric coarse pitch.
Yes. These star knobs work well with aluminum T-slot extrusions (such as 20-series or 40-series profiles) when paired with the appropriate T-nut. Select M8 or M10 to match your T-nut thread. The D49mm flange is particularly useful on T-slot setups as it provides a wider bearing surface against the extrusion face.
Match the thread size to your existing threaded insert, T-nut, or tapped hole. M8 is the more common choice for lighter jigs and woodworking fixtures, while M10 is preferred for heavier-duty metalworking or machine tool applications where greater clamping force is needed. If you are tapping a new hole, M10 gives more thread engagement and holding strength in softer materials like aluminum or MDF.
