Screw: hexagon socket set

ISO 4028

ISO 4028 - Hexagon socket set screws with dog point

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Hexagon socket set screws with a dog point, the ISO standard that replaced DIN 915: the same headless screw as the cone point ISO 4027 and DIN 914, but the thread ends in a short plain cylinder, the dog, that enters a hole drilled in the shaft or a groove along it. The screw is threaded up to the dog 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 dog locates the part by its shape instead of holding it by friction: it keeps a hub or a collar in a fixed position or lets a part slide along a groove without turning, and it also serves as a locating pin or a pivot. The dog diameter dp is about 0,7 d and is reached by a 45 degree chamfer from the thread; short screws, up to a length that depends on the size, have the short dog z of about a quarter of d, a shallower socket and a 120 degree chamfer at the socket end, longer ones the long dog of about half of d and a 90 degree chamfer. 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.