Knurled Thumb Screws Aluminium Handle + Stainless Rod Hand Grip Knob Bolt M8 M10

Choose the thread size that matches your existing threaded hole or insert. M8 (8 mm nominal diameter) is the more common choice for lighter panels, enclosures, and 3D printer beds. M10 (10 mm nominal diameter) is better suited to heavier clamping loads, thicker plates, and structural jig components. If you are unsure, measure the inner diameter of your threaded hole: M8 holes are typically 6.8 mm before tapping, M10 holes are typically 8.5 mm before tapping.

Thread length should be at least 1.5× the thread diameter for reliable engagement — so M8 needs at least 12 mm of thread in the material, and M10 needs at least 15 mm. Add the thickness of any material being clamped to determine the minimum total thread length required. For through-hole applications, the thread length should equal the material thickness plus the depth of the receiving nut or insert.

The stainless steel rod offers good corrosion resistance for light outdoor and damp indoor use. The aluminium handle is anodised, which provides a protective oxide layer. However, prolonged immersion or exposure to salt spray may eventually affect the aluminium. For marine or fully outdoor applications, inspect periodically and apply a light lubricant to the thread if needed.

Typical hand-applied torque on a 20 mm diameter knurled knob is approximately 0.5–1.5 N·m depending on grip strength and surface condition. This is sufficient for panel retention, light fixture clamping, and adjustment locks. For applications requiring precise or higher torque, a conventional hex bolt with a torque wrench is more appropriate. These screws are designed for tool-free convenience, not structural load-bearing joints.

Yes. The thread size, thread length, handle dimensions, and material composition are identical across all three colour options. The colour difference is purely in the anodised finish of the aluminium handle. This makes colour-coding straightforward — for example, Red for tension adjustments, Black for position locks, and Silver for standard panel fasteners — without any functional trade-off.

Yes. The threaded rod uses standard ISO metric thread profiles (M8 × 1.25 pitch for M8, M10 × 1.5 pitch for M10 — the most common coarse-pitch specifications). They are compatible with standard hex nuts, wing nuts, T-nuts, threaded inserts, and tapped holes machined to ISO metric tolerances. If your application uses a fine-pitch thread, please confirm the pitch before ordering.

The 5-pack price is typically around 60–65% of the cost of five individual units, making it the more economical choice when you need multiple fasteners of the same specification. If you are building a jig, enclosure, or machine with several identical adjustment points, the 5-pack reduces per-unit cost and ensures colour consistency across all fasteners.