🔧 Product Overview: M3–M8 Knurled Thumb Screws – Aluminum Handle + Stainless Steel Thread, Hand Grip Knob Bolts
For heavy‑duty hand‑tightening applications where a large, comfortable grip is essential, these knurled thumb screws with an aluminum handle and stainless steel threaded rod are the perfect solution. The high‑type knurled aluminum handle (anodized in Red, Black, or natural Aluminum) provides an excellent non‑slip grip, even with oily or gloved hands. The stainless steel threaded stud offers strength, corrosion resistance, and durability. Available in metric sizes M3, M4, M5, M6, and M8, with thread lengths from 6mm up to 135mm (measured under the head). Grade 8 strength. Ideal for machine assembly, bed clamps, accessories, and industrial equipment where frequent tool‑less adjustments are needed.
✨ Why These High‑Type Knurled Thumb Screws Stand Out
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High‑type knurled aluminum handle – Tall, textured grip provides excellent leverage and comfort for hand tightening and loosening – no tools required.
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Dual‑material construction – Anodized aluminum alloy handle (lightweight, corrosion‑resistant) + stainless steel threaded rod (strong, rust‑proof).
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Available handle colors – Red, Black, or natural Aluminum (silver). Anodized finish for durability and style.
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Wide metric range: M3, M4, M5, M6, M8 – Covers small electronics up to medium‑duty industrial equipment.
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Extensive thread lengths: 6mm to 135mm – Choose from a huge range of lengths to fit any panel thickness or assembly depth.
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Grade 8 strength – High‑strength stainless steel thread for reliable, long‑lasting fastening.
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Coarse metric pitch, fully threaded – Standard threads per size, fully threaded for maximum grip.
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Wide applications – Machine assembly, bed clamps, jigs and fixtures, industrial equipment, woodworking tools, and heavy‑duty DIY projects.
📏 Technical Specifications – Knurled Thumb Screws (Aluminum Handle + Stainless Thread)
| Specification |
Details |
| Product Type |
High‑Type Knurled Thumb Screws (Hand Grip Knob Bolts) |
| Handle Material |
Aluminum alloy (anodized – Red, Black, or Natural) |
| Thread Material |
Stainless steel |
| Thread Sizes |
M3, M4, M5, M6, M8 |
| Thread Pitches (coarse) |
M3x0.5, M4x0.7, M5x0.8, M6x1.0, M8x1.25 |
| Thread Length Range (under head) |
6,8,10,12,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100,105,115,125,135mm (select from options) |
| Length Measurement |
Under head – from underside of handle to tip (handle not included) |
| Strength Grade |
Grade 8 |
| Drive Style |
Hand grip (toolless) |
| Standard |
GB |
❓ FAQs – High‑Type Knurled Thumb Screws
🔸 What does “high‑type” mean? How is it different from standard knurled thumb screws?
“High‑type” refers to the taller, more pronounced knurled handle. This gives you a larger gripping surface and more leverage, making it easier to apply torque by hand – especially useful for larger thread sizes (M6, M8) or when you need extra tightening force.
🔸 How is thread length measured for these thumb screws?
Thread length is measured from the underside of the aluminum handle (where the stainless steel thread begins) to the tip of the thread. The handle itself is not included. For example, an M6 x 50mm screw has a 50mm long threaded shank.
🔸 Are these screws fully threaded? What are the thread pitches?
Yes – they are fully threaded with standard metric coarse pitches. M3x0.5, M4x0.7, M5x0.8, M6x1.0, M8x1.25.
🔸 What handle colors are available?
We offer Red, Black, and natural Aluminum (silver). Please select your preferred color from the dropdown options when ordering.
🔸 Can I use these screws with nuts, or are they for tapped holes only?
These are standard machine screws – they work with matching metric nuts (M3–M8) or in pre‑tapped holes. For through‑hole applications, use a nut on the back side. The aluminum handle is for hand grip only and should not be used with wrenches.
🔸 What lengths are available for each thread size?
We offer a wide range of lengths from 6mm to 135mm. Not every length may be available for every diameter – please select your desired size and length from the dropdown options. If you need a specific combination not listed, contact us for custom orders.
