Extertal grinding may refer to all outside diameter grinding and the requirements of it vary from fast removal to mirror finish. Grinding with the surface called surface grinding and it has a larger contact area than external grinding. Therefore softer grade wheels may be more suitable to be used, expecially the diamter of wheels is larger. Choose the right wheels according to the requirements of workpieces.

D	T	H	P	F
200	32	75	125	16
	40			20
300	40	127	200	13
	50			20
350	40			13
	63			30
400	50	203	265	20
500	63			20
	75	305	375	25
	75			30
	100
	150
600	75	305		25
	100
	150	250