Screw: hexagon socket set

ISO 4029

ISO 4029 - Hexagon socket set screws with cup point

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Hexagon socket set screws with a cup point, the ISO standard that replaced DIN 916: the same headless screw as the cone point ISO 4027 and DIN 914, but the thread ends in a hollow cone, the cup, whose sharp rim cuts a ring into the shaft. The screw is threaded over its whole length and driven by a hexagon key in the socket of its other end, so it sinks fully into its hole and nothing stands proud. The cup is the most widely used point of a set screw: its rim grips a plain round shaft firmly without a drilled spot and resists loosening under vibration, which makes it the point for pulleys, gears and collars on plain shafts, and the mark it leaves is only a small ring. The rim diameter dz is about 0,6 d and is reached by a 45 degree chamfer from the thread, and the cup inside is a cone of about 120 degrees; on short screws, up to a length that depends on the size, the chamfer at the socket end is 120 degrees instead of 90 and the socket is shallower. Steel screws are made to hardness class 45H and stainless steel ones to classes A1-12H, A2-21H, A3-21H, A4-21H and A5-21H; the thread is ISO metric coarse with tolerance 6g and the product grade is A. Covers threads M1,6 to M24 with lengths from 2 to 60 mm.