🔧 Product Overview: M10 Knurled Thumb Screws with Stepped Hand Grip – Aluminum Alloy Step Bolts
For heavy‑duty hand‑tightening applications where a large, comfortable grip and precise thread engagement are required, these M10 knurled thumb screws with a stepped handle are an excellent choice. The stepped handle design (20mm diameter, 20mm length) provides a generous gripping surface and the knurled texture ensures a secure, non‑slip hold for tool‑less operation. Made from lightweight, corrosion‑resistant aluminum alloy, they are ideal for machinery, precision molds, bearing assembly, and industrial equipment. Fully threaded with M10 coarse pitch (1.5mm), and available in thread lengths from 16mm to 125mm (measured under the head). Available in natural or anodized finish.
✨ Why These Stepped Knurled Thumb Screws Are a Workshop Essential
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Stepped handle design – The 20mm diameter x 20mm length stepped handle provides an ergonomic, comfortable grip with excellent leverage for hand tightening.
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Knurled surface for non‑slip grip – Diamond knurl pattern ensures secure finger traction even with oily or gloved hands – no tools needed.
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Lightweight aluminum alloy – Strong yet lightweight, corrosion‑resistant, and available in natural or anodized finish.
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M10 metric thread – fully threaded – Standard coarse pitch (1.5mm). Threads run the entire length for maximum grip and easy nut engagement.
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Wide thread length range: 16mm to 125mm – Available in many lengths (16,20,25,30,35,40,45,50,55,60,65,70,75,85,95,105,115,125mm) to suit various panel thicknesses and assembly depths.
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Smooth, burr‑free workmanship – Deep, clear threads with uniform force distribution; threads are not easy to slip during use.
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Wide applications – Machinery, precision molds, bearing assembly, industrial equipment, jigs, fixtures, and heavy‑duty DIY.
📏 Technical Specifications – M10 Stepped Knurled Thumb Screws
| Specification |
Details |
| Product Type |
Stepped Knurled Thumb Screws (Hand Grip Step Bolts) |
| Material |
Aluminum alloy |
| Thread Size |
M10 |
| Thread Pitch |
1.5mm (standard metric coarse) |
| Thread Type |
Fully threaded |
| Thread Length Range (under head) |
16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 85mm, 95mm, 105mm, 115mm, 125mm (select from options) |
| Length Measurement |
Under head – from underside of stepped handle to tip (handle not included) |
| Handle Diameter |
20mm |
| Handle Length (stepped section) |
20mm |
| Handle Style |
Knurled stepped cylinder (diamond knurl) |
| Drive Style |
Hand grip (toolless) |
| Finish Options |
Natural aluminum or Anodized (select from options) |
❓ FAQs – M10 Stepped Knurled Thumb Screws
🔸 What is the advantage of the stepped handle design?
The stepped handle provides a larger diameter grip section (20mm) compared to the threaded shank, giving you more leverage and comfort for hand tightening. The step also acts as a visual and tactile reference point. The 20mm handle length fits comfortably in the hand.
🔸 How is thread length measured? Which length should I choose?
Thread length is measured from the underside of the stepped handle to the tip. For standard panel thicknesses (10‑20mm), choose a length 5‑10mm longer than the panel to allow nut engagement. For pre‑tapped holes, measure the hole depth and select a length slightly shorter than that depth.
🔸 Are these screws fully threaded? What is the thread pitch?
Yes – they are fully threaded from under the handle to the tip. The thread pitch is standard M10 coarse: 1.5mm.
🔸 Will the anodized finish wear off over time?
Anodizing creates a durable, bonded oxide layer that will not peel like paint. Under normal hand use, the finish will remain intact for years. For natural aluminum (uncoated), the surface may develop a natural patina but will not rust.
🔸 Can I use these screws with nuts, or are they for tapped holes only?
These are standard machine screws – they work with matching M10 nuts or in pre‑tapped holes. For through‑hole applications, use a nut on the back side. The stepped handle is designed for hand grip only – do not use tools on the knurling.
🔸 Are these screws magnetic? Will they affect sensitive equipment?
Aluminum is non‑magnetic, so these thumb screws will not interfere with sensitive electronics, magnetic sensors, or precision measuring equipment. They are completely safe for use in electronic and medical device manufacturing.
