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Thumb Screw Knob - Compatible Screw Sizes - M8 ; Base Diameter - 13.0 mm | 0.512 in ; Overall Height - 18.0 mm | 0.709 in ; Knob Diameter - 25.0 mm | 0.984 in Knurled Knob - Compatible Screw Sizes - M5 ; Base Diameter - 10.0 mm | 0.394 in ; Overall Height - 21.5 mm | 0.846 in ; Knob Diameter - 20.0 mm | 0.787 in 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. If a panel or component needs to be fastened down reasonably tightly, but access for a screwdriver or wrench is limited, manufacturers will often choose to include a thumb screw instead. Thumb Screw Knob - Compatible Screw Sizes - M10 ; Base Diameter - 17.0 mm | 0.669 in ; Overall Height - 23.0 mm | 0.906 in ; Knob Diameter - 36.0 mm | 1.417 in
Most thumb screws come in either long or very short lengths, depending on the application where they are needed. To choose the best thumb screw for the task, it is important to bear in mind certain characteristics such as length, diameter, and thread size. Thumb Screw Knob - Compatible Screw Sizes - M5 ; Base Diameter - 8.0 mm | 0.315 in ; Overall Height - 11.5 mm | 0.453 in ; Knob Diameter - 17.0 mm | 0.669 in 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. Thumb Screw Knobs Thumb screw thread gauge and diameter are typically stated in metric units in the UK. Elsewhere, measurements given in inch sizes may be more widespread. 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.Small thumb screws can be as short as 4mm or less from the shoulder to the end of the threading, while long thumb screws commonly extend to around 25-30mm (1 inch) and beyond. It is unusual to find very long thumb screws for most day-to-day fastening jobs. This tends to imply that the product would need to be more rigid (less range of deflection) and have greater tensile strength than most of these relatively small fasteners tend to offer. Thumb screws are best used in applications where the fastener doesn't need to be torqued excessively tightly.
Thumb Screws or Knurled Knob Screws are designed to be tightened and loosened by hand, without the need Knurled Knob - Compatible Screw Sizes - M3 ; Base Diameter - 6.0 mm | 0.236 in ; Overall Height - 19.5 mm | 0.768 in ; Knob Diameter - 12.0 mm | 0.472 in Knurled Knob - Compatible Screw Sizes - M4 ; Base Diameter - 8.0 mm | 0.315 in ; Overall Height - 17.5 mm | 0.689 in ; Knob Diameter - 16.0 mm | 0.63 inKnurled thumb screws are commonly chosen because they give the user a better grip on the head of the fastener when installing by hand.
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