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4 ACCREDITED TEST LABORATORY Friction coefficient testing — from very small to M80 Apretensioned screw connection is not possible without friction At the same time the friction coefficient must be stable to allow a consistent assembly and maximum loadbearing capacity We test standard screws from M5 to M80 For the larger screws we use one of the world’s largest friction coefficient testing machines for fasteners This machine can test screws with a clamp force of up to 5 000 kN with a total torque of up to 60 000 Nm to ensure the load has been obtained Screw connections • DIN EN ISO 16047 • DIN EN 14399 • VDA 235-203 Standardised friction coefficient determination e g according to