Type	Dimension(mm)									Note
	D	H	h	h1	r	α	α1	β	e
PMM20-97001	14.8	20.5	12.5	4.0	2.0	90°	35°	45°	1.5	G97580
PMM2018	18.0	30.0	20.0	6.0	1.5	80°	30°		1.0	X7404
PMM20-98002		35.0	28.0	4.0	2.5	110°	45°	62°30'	3.5	G98140