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Thumb screws (sometimes written as thumbscrews) are multipurpose fasteners designed to be tightened and loosened by hand, rather than needing tools like screwdrivers or wrenches for installation. They offer excellent rigidity and positional accuracy, with stainless steel also being an option in cases where the material must continue to look immaculate over extended periods. Knurled grip nuts are a fully turned single piece made from stainless steel and provide a large knurled grip surface. Indeed, nylon knurled head knobs can often be bought on their own, with the heads intended to be press-fit onto thumb screws for easier installation and removal. The metric sizing (M5, M6, M12 etc) is a reference to the diameter of the shaft in mm, while thread measurements are taken from ridge to ridge on the threaded shaft section itself.
Thumb Screws | Knurled, Wing and Adjustable Knobs Thumb Screws | Knurled, Wing and Adjustable Knobs
Their main use is for fastening down panels, wiring, lids, safety covers, battery compartments, and any other part or component that might need to be removed and reinstalled frequently. Thumb screws and thumb screw bolts can also be useful solutions in a situation where you may need to remove a component or panel regularly. Knurled head thumb screws are one of the most common applications of this technique, which can be found on many types of stainless steel or nylon nuts, screws and bolts. The pattern of bumps, ridges or notches allows for much-improved friction between fingers and the otherwise smooth edges of the thumb screw.
Stainless steel knurled nuts are to DIN 466 and feature a knurled grip, with a tapped through shoulder.
M5 x 10mm Knurled Thumb Screws (DIN 464) - Accu
Most thumb screws come in either long or very short lengths, depending on the application where they are needed. The range also features a black Polyamide (PA 6) Knurled Kbob, suitable for Socket Head Caps Screws, which easily assembles into the base of the knob.
Thumb screws are best used in applications where the fastener doesn't need to be torqued excessively tightly. Knurled nuts are to DIN 466 and feature a knurled grip, with a tapped through shoulder, and they are turned from steel and black oxide finished. Knurled Knobs, or Thumb Knobs easily press fit on to screws, creating a small knob for clamping or securing an application. The thumb screw is designed to be easily tightened and loosened by hand, hence the name thumb screw.
Metric Thumb Screws | McMaster-Carr
Knurling is a widespread manufacturing technique for improving grip or torque force on a huge array of hand-installed components and fasteners. Thumb screws are ideal for applications where you just need something light, easy, and quick to work. Common sizes that fit the threaded holes in a wide variety of everyday UK devices, panels and covers include M6 thumb screws, M4 knurled thumb screws, M8 thumb screws, and M12 thumb screws. The length of a thumb screw is almost always stated in millimetres (mm) and measured from just below the heads or shoulders to the opposite (flat) end of the threaded section. They are especially cost-effective if you simply need the screw to be effective, lightweight, sturdy, corrosion-resistant, non-conductive, and easy to tighten or loosen.
They have a wide range of useful applications, especially in parts, materials and builds that do not easily support the use of manual or power tools. Generally used in timber to timber and timber to metal construction, these bolts incorporate a square neck to grip the hole in the timber when fitting, and therefore negates the need for any drive recess to be included on top of the head. Brass thumbscrews are therefore ideal for fixtures and fittings, musical instruments and mechanical assemblies.
Thumb Bolts | Thumb Knob | M6 Thumb Screw | Thumb Screw Knob Thumb Bolts | Thumb Knob | M6 Thumb Screw | Thumb Screw Knob
One of the main reasons why thumb screws are often chosen over traditional screws is that certain parts and assemblies do not leave much room for using hand tools. Knurled thumb screws are commonly chosen because they give the user a better grip on the head of the fastener when installing by hand.They will often have knurled edges around the head section too, further improving friction and purchase while being turned by hand. There are varying threaded nuts, from low profile flat knurled nuts to the deeper grip nuts for added grip surface area.
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