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When you need to tighten, adjust, or remove fasteners repeatedly without reaching for a wrench, standard bolts slow you down. Makers, machine builders, and workshop technicians who work with panels, enclosures, jigs, and fixtures need a fastener they can operate bare-handed — quickly and reliably. These knurled thumb screws are designed exactly for that workflow.
Each knurled thumb screw combines an aluminum alloy knob head (D20 × 20 mm) with a stainless steel threaded bolt. Available in M8 and M10 thread diameters, with bolt lengths ranging from 15 mm to 135 mm (approximately 0.59 in to 5.31 in) for M8, and 16 mm to 125 mm (approximately 0.63 in to 4.92 in) for M10. Finish options include Red, Black, and Silver anodized aluminum heads.
Typical use cases include hand-tightened panel fasteners on electronic enclosures, quick-release fixture bolts on CNC jigs and 3D printer frames, and adjustable clamping knobs on photography rigs and optical benches — anywhere you need knurled thumb screw hand-tighten access without tools.
The D20 × 20 mm knurled aluminum knob provides a secure grip for hand-tightening and loosening without any tools, saving time on repetitive adjustments.
Aluminum alloy knob head keeps weight low while the stainless steel bolt shaft delivers corrosion resistance and thread durability under repeated use.
M8 bolts from 15–135 mm and M10 bolts from 16–125 mm cover the majority of panel, fixture, and enclosure fastening applications in one product family.
Red, Black, and Silver anodized heads let you color-code fasteners by zone, function, or torque level — useful for quick visual identification on complex assemblies.
The flat head profile sits flush against surfaces and the closed end prevents debris ingress into the thread, keeping the bolt clean between uses.
Order as a single piece for prototyping or a 10-pack for production builds and bulk fixture setups — both options available for every size and color combination.
| Type | Knurled Thumb Screw (Hand Turn Knob Bolt) |
|---|---|
| Thread Standard | Metric (ISO) |
| Thread Diameter | M8, M10 |
| Bolt Length Range (M8) | 15 mm – 135 mm (0.59 in – 5.31 in) |
| Bolt Length Range (M10) | 16 mm – 125 mm (0.63 in – 4.92 in) |
| Knob Diameter | D20 mm (0.79 in) |
| Knob Height | 20 mm (0.79 in) |
| Head Style | Flat |
| End Type | Closed |
| Shape | Round |
| Knob Material | Aluminum Alloy (anodized) |
| Bolt Material | Stainless Steel |
| Available Colors | Red, Black, Silver |
| Thread Pitch | See variant options |
| Quantity Options | 1 PCS, 10 PCS |
Match the thread diameter to your existing tapped hole or nut. M8 has an 8 mm nominal diameter and is common in lighter panel and enclosure work, while M10 is used where higher clamping force or a larger knob footprint is needed. Check your hole size before ordering.
Measure the total thickness of the material(s) being clamped, then add at least 10–15 mm for thread engagement. For example, clamping a 10 mm panel into a 15 mm deep tapped hole requires a bolt length of at least 25 mm. Choose the next available length up from your calculated minimum.
The bolt shaft is stainless steel, which provides good resistance to moisture and mild corrosion. The aluminum alloy knob is anodized for surface protection. These fasteners are suitable for indoor workshop environments and light outdoor use, but are not recommended for continuous immersion or highly corrosive chemical exposure.
Knurled thumb screws are designed for hand-tightened, low-to-medium clamping force applications. They are not intended to replace torqued hex bolts in structural or high-vibration joints. They excel in applications where frequent manual adjustment is needed and where the joint does not require high preload.
Yes. These thumb screws work with any material that has a compatible M8 or M10 tapped hole, including aluminum extrusions, steel sheet panels, and thick plastic enclosures. For plastic, ensure the thread engagement depth is sufficient to avoid stripping — typically at least 1.5× the bolt diameter.
The color difference is purely the anodized finish on the aluminum knob head. All three colors share the same dimensions, thread specifications, and stainless steel bolt. Color-coding is useful for distinguishing fastener zones, torque levels, or assembly stages on complex builds.
The 1 PCS option is ideal for prototyping, replacement, or low-quantity builds. The 10 PCS pack offers a lower per-unit cost and is suited for production fixtures, panel assemblies, or stocking your workshop with a consistent size. Both options are available for every size and color combination.
