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KEENSERTS
Design information

If KEENSERTS inserts are installed on the end face in round designs, the installation diameter should be 1.5 x external thread diameter „ØD“ or larger.

The edge or corner distance (e) of the thread inserts must be adapted to the application. Standards must be observed here if necessary. As a reference value, e ≥ 1,2 x Ød can be used.
For full load capacity, the minimum thickness „L“ must at least equal to the length of the thread insert. The depth of the KEENSERTS insert under the surface of the installation material is determined by the KEES as well as the diameter of the countersink of the installation thread
(see installation data tables).
The threads must be produced according to DIN13-20/21/22. The core diameters are modified.
Installation data as well as removal data are given in the following tables.

Calculation of the tensile force

The tensile force of the KEENSERTS inserts depends on the shear strength of the installation material and is calculated as described below:

When Fmax is reached, the surrounding material begins to yield and shear off between the threads.
The values of the shear engagement areas are given in the dimension tables on the following pages and apply to fully screwed KEENSERTS inserts.
„Surface Comparison“ Screw to KEENSERTS®
Depending on the selection, the use of KEENSERTS inserts allows up to 68% higher screw force to be introduced into the surrounding material.

Self-locking and screw pre-tensioning
Because the thread locking feature (type L) compensates a part of the tightening torque through friction, this part must be added to the nominal tightening torque.
For this purpose, the locking torque is measured on two KEENSERTS inserts using a torque wrench and a lightly oiled screw. This value must be added to the tightening torque.
The thread locking torques are determined with lightly oiled screws of grade 8.8, with a tolerance of -6g. The thread locking torques of the KEENSERTS inserts with fine thread are set with hardened lightly oiled bolts of grade -4h.
If you have any questions, please do not hesitate to contact us.