Cap screws are used as a fastener for machine parts. Metric cap screws are categorised by the diameter across the widest section of their thread in millimetres. Small metric cap screws vary from the M10 (with a 1cm diameter) to the M5 (with a 5mm diameter). Cap screw torque specifications determine the force required to tighten them. The International Organization for Standardization provides general specifications, but they may vary depending on the use and the manufacturer.
M5 Cap Screw
M5 cap screws have a maximum thread width of 5mm and a torque specification of 68 inch-lbs. force, if lubricated, 91 inch-lbs. force if they are dry.
M6 Cap Screws
M6 cap screws have a thread width of 6mm and a torque specification of 116 inch-lbs. force when lubricated, and 156 inch-lbs. force when the cap screw is dry.
M7 Cap Screws
M7 cap screws require, according to ISO 898-1, a torque of 260 inch-lbs. force when dry and 195 inch-lbs. force when adequately lubricated.
M8 Cap Screws
Cap screws with a thread diameter of 8mm, known as M8, require 377 inch-lbs. force of torque. If the screw is lubricated, it requires 288 inch-lbs. force.
M10 Cap Screws
M10 cap screws require 62 foot-lbs. force when lubricated, and 47 foot-lbs. force when lubricated.
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