1/4" Knurled Thumb Screws – Stainless Steel & Anodized Aluminum Hand Grip Knob Bolts

Measure the depth of the threaded hole or the thickness of the material you need to clamp. Generally, the engaged thread length should be at least 1–1.5× the thread diameter for secure holding. For a 1/4" (BSW) thread, aim for at least 6–8mm of thread engagement. Available lengths range from 10mm (≈3/8") to 40mm (≈1-9/16") — choose the shortest length that gives you adequate engagement to keep the overall profile compact.

The 12mm (≈15/32") head is compact and suited for tight spaces or lightweight panels where a smaller footprint is needed. The 20mm (≈25/32") head provides a larger grip surface, making it easier to tighten by hand and distributing clamping load over a wider area — typically preferred for frequent adjustments or thicker assemblies.

These thumb screws are designed for hand-tightened, tool-free fastening in light-to-medium duty applications such as panel retention, jig fixtures, and equipment covers. They are not typically rated for high-torque or structural load-bearing use. For exact load ratings relevant to your application, contact us to confirm before ordering.

The stainless steel shaft provides good corrosion resistance for general outdoor and workshop use. The anodized aluminum knob head also offers a protective oxide layer against light moisture and humidity. However, for prolonged exposure to saltwater, acidic chemicals, or highly corrosive industrial environments, additional protective measures are generally recommended. Contact us to confirm suitability for your specific conditions.

These use BSW (British Standard Whitworth) 1/4" threading. BSW threads have a different pitch and thread form than UNC (Unified National Coarse) 1/4"-20 threads commonly used in the US. They are not interchangeable. Please verify your mating hardware — threaded inserts, nuts, or tapped holes — uses BSW 1/4" threading before ordering. If you need UNC compatibility, contact us to confirm availability.

Yes — knurled thumb screws are commonly used on 3D printer enclosure panels, camera accessories, electronics chassis, and DIY project boxes where tool-free access is needed. They work well anywhere you need quick-release hand-tightened knob bolts. Confirm your frame or enclosure uses BSW 1/4" threaded inserts or nuts before purchasing.

Both colors feature anodized aluminum knob heads and are functionally identical. The color difference is purely aesthetic — red is often used for visual identification or color-coded panel access points, while black offers a more neutral, professional appearance that blends into most equipment builds.