IKO heavy duty roller followers NURT series:

Shaft dia	Identification number					Mass g	Dimensions mm
mm	Crowned outer ring		Cylindrical outer ring				d	D	B	C	a
15	NURT 15 R		NURT 15			100	100	15	35	18	20
	NURT 15-1 R		NURT 15-1			160	160	15	42	18	20
17	NURT 17 R		NURT 17			147	147	17	40	20	22
	NURT 17-1 R		NURT 17-1			222	222	17	47	20	22
20	NURT 20 R		NURT 20			245	245	20	47	24	27
	NURT 20-1 R		NURT 20-1			321	321	20	52	24	27
25	NURT 25 R		NURT 25			281	281	25	52	24	31
	NURT 25-1 R		NURT 25-1			450	450	25	62	24	31
30	NURT 30 R		NURT 30			466	466	30	62	28	38
	NURT 30-1 R		NURT 30-1			697	697	30	72	28	38
35	NURT 35 R		NURT 35			630	630	35	72	28	44
	NURT 35-1 R		NURT 35-1			840	840	35	80	28	44
40	NURT 40 R		NURT 40			817	817	40	80	30	49
	NURT 40-1 R		NURT 40-1			1130	1130	40	90	30	49
45	NURT 45 R		NURT 45			883	883	45	85	30	53
	NURT 45-1 R		NURT 45-1			1400	1400	45	100	30	53
50	NURT 50 R		NURT 50			950	950	50	90	30	58
	NURT 50-1 R		NURT 50-1			1690	1690	50	110	30	58