Thread        d1mm	ST2.9	ST3.5	ST4.2	ST4.8	ST5.5	ST6.3
Head Diameter d2 mm	5.5	7.3	8.4	9.3	10.3	11.3
Head Height     k max	1.7	2.1	2.5	2.8	3.4	3.8
Cross lenth      m	3	4.2	4.6	4.7	5.1	6.8
L	9.5-50