Products > CLAMP® Tension Nut
CLAMP® Independent TestsTorque and Pretensioning Force test Independent test performed by BAFS AG on the HYTORC-CLAMP to determine:
Their Findings
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CLAMP® Independent TestsTorque and Pretensioning Force test Independent test performed by BAFS AG on the HYTORC-CLAMP to determine:
Their Findings
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Determine the accuracy and scatter of the Pretensioning force when several CLAMP connections are tightened to the same torque setting; Make a statement about the tightening factor alpha; Measure the torsional moments; Demonstrate that the CLAMP does not rotate on the contact surface; Demonstrate that the hydraulic torque wrench does not need any eccentric reaction arm; Demonstrate that no bending moments are introduced into the bolt connection; Perform a static shear test.
The CLAMP is a machine part which allows a lateral load-free and torsion-free tightening of bolt connections without external support. Bending loads do not occur on the bolt fitting. The bolt cannot turn with the CLAMP, and the CLAMP also does not turn on the contact surface. The low scatter in the Pretensioning force values is due mainly to assembly conditions which can be controlled and checked better than those of bolt connections with usual standard hex nuts. The scatter in the Pretensioning force is very small, since the surface quality is always the same; in the tests the maximum scatter was only 3.5%. Torsional moments did not occur in the bolt fittings. The torque wrench operates without an eccentric reaction support arm, as it is supported on the CLAMP itself. The use of the CLAMO can clearly minimize the scatter in the Pretensioning force during tightening. The contact surface under the CLAMP is only loaded by pressure.