SPEDEC SCI Self-drilling mushroom head screw with SR ...
Applicable for direct-assembly of plywood and particleboard liners on aluminium and steel cross members. Max. grip length KL = L – L 1; SR-recess is a cross recess/square recess combination. Assembly with SR screwdriver bits, see group code 31630 and 31640. Steel with pull-out force max. 540 N/mm 2. Driving features
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