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ISO 898-7 (Complete Document)
Revision / Edition: 1ST Chg: Date: November 1, 1992
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MECHANICAL PROPERTIES OF FASTENERS - PART 7: TORSIONAL TEST AND MINIMUM TORQUES FOR BOLTS AND SCREWS WITH NOMINAL DIAMETERS 1 MM TO 10 MM
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This part of ISO 898 specifies a torsional test for the determination of the breaking torque of bolts and screws with nominal diameters 1 mm to 10 mm with property classes 8.8 to 12.9 in accordance with ISO 898-1. The test applies to bolts and screws with thread less than M3 for which no breaking and proof loads are indicated In ISO 898-1, as well as to short bolts and screws with nominal diameters 3 mm to 10 mm which cannot be subjected to a tensile test.

The minimum breaking torques are not valid for hexagon socket set screws.

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