The needle roller bearing - NTN Bearing Wizard - needle roller bearings by size
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Slotted heads are typically better in applications where it's going to be unscrewed and re-done periodically, as the head tends to wear less.
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For most flat head screw designs the angle of countersink is usually 82° for UNC and UNF applications however other angles ranging from 60° -120° could be specified.
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Flat head screws are characterized by having a head with a flat top and bottom that is cone shaped or countersunk. With this design, the head of the screw can align flush or below the surrounding surface having obvious benefits.
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