Title: Listeskrue 3,5x45.pdf
The drill hole diameters are:Outer thread diameter 4,0 4,5 5,0 6,0 8,0 10,0 12,0Drill hole diameterSoftwood 2,5 2,5 3,0 4,0 5,0 6,0 7,0Hardwood 3,0 3,0 3,0 4,0 6,0 7,0 8,0a1 = 5 ∙ d a2 = 5 ∙ dSpacing a1 parallel to the grain Spacing a2 perpendicular to the grain Distance a3,c from centre of the screw-part in timber to the end grain Distance a4,c from centre of the screw-part in timber to the edgea3,c = 9 ∙ da4,c = 4 ∙ dSpacing a2 perpendicular to the grain may be reduced from 5∙d to 2,5∙d, if the condition a1∙a2 ≥ 25∙d² is fulfilled.For Douglas fir members minimum spacing and distances parallel to the grain shall be increased by 50%.The hole diameter in steel members must be predrilled with a suitable diameter.Only the equipment prescribed by fischerwerke GmbH & Co. KG shall be used for driving the screws.