Hexalobular socket raised countersunk head screws
This International Standard specifies the characteristics of hexalobular socket raised countersunk head screws in product grades A and with thread sizes from M2 to M10 inclusive.

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Countersunk flat head screws (common head style) with type H or type Z cross recess — Product grade A — Part 1: Steel screws of property class 4.8
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Three wires for screw thread measuring and four wires for screw thread measuring
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