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Small-Diameter Bearing (Open Type, Double Shielded, Rubber Seal Type) (634U)

Volume Discount

Small Ball Bearings
These bearings are used for various applications that require low friction and high-speed rotation in small spaces. These bearings are available in various sizes to choose from.
[Feature]
● Bearing Size Standards: Metric System
● Inner Diameter Minimum / Maximum (mm.) : 1 and 10
● Outer Diameter Minimum / Maximum (mm.) : 3 and 19
● Width Minimum / Maximum (mm.) : 1 and 6
● Precision (JIS) : Grade 0
● Bearing Type : Open/ Closed (Double Shielded (ZZ) and Rubber Sealed (DD1))
● Load Direction : Radial Load
[Application]
It is used to support and guide rotating machine's components, such as shafts, wheels, pulleys ,etc

(i)Caution

Some of the items are scheduled to be discontinued as of end of March in 2023. The manufacturer keep the items produced but they are not available with Misumi.
There are not the replacement items and the plan to resumption of sale. Please check the quotation and order screen for details.

Part Number

Configured Part Number is shown.

634U

Product Specifications
Part Numbers
Catalog

Drawing

600 type / MR type
Inner diameter 1–4 mm

600 type / MR type
Inner diameter 5–9 mm

F600 type / MF type
Inner diameter 1 to 4 mm

F600 type / MF type
Inner diameter 5 to 9 mm

SMT type
Inner diameter 10 to 15 mm

Specifications Table

600 type / MR type
Inner diameter 1–4 mm

Part number				Main Dimensions (mm)						Standard rated load
Open type	Shield Shape	Seal Type		d	D	B	B₁	r^(*1) Minimum	r₁^(*1) Minimum	(N)		N (kgf)
Open type	Shield Shape	Seal Type		d	D	B	B₁	r^(*1) Minimum	r₁^(*1) Minimum	C_r	C_or	C_r	C_or
681	-	-	-	1	3	1	-	0.05	-	80	23	8	2.5
MR31	-	-	-	1	3	1.5	-	0.05	-	80	23	8	2.5
691	-	-	-	1	4	1.6	-	0.1	-	138	35	14	3.5
MR41X	MR41XZZ	-	-	1.2	4	1.8	2.5	0.1	0.1	138	35	14	3.5
681X	681XZZ	-	-	1.5	4	1.2	2	0.05	0.05	112	33	11	3.5
691X	691XZZ	-	-	1.5	5	2	2.6	0.15	0.15	237	69	24	7
601X	601XZZ	-	-	1.5	6	2.5	3	0.15	0.15	330	98	34	10
682	682ZZ	-	-	2	5	1.5	2.3	0.08	0.08	169	50	17	5
MR52B	MR52BZ	-	-	2	5	2	2.5	0.1	0.1	187	58	19	6
692	692ZZ	-	-	2	6	2.3	3	0.15	0.15	330	98	34	10
MR62	MR62ZZ	-	-	2	6	2.5	2.5	0.15	0.15	330	98	34	10
MR72	MR72ZZ	-	-	2	7	2.5	3	0.15	0.15	385	127	39	13
602	602ZZ	-	-	2	7	2.8	3.5	0.15	0.15	385	127	39	13
682X	682XZZ	-	-	2.5	6	1.8	2.6	0.08	0.08	208	74	21	7.5
692X	692XZZ	-	-	2.5	7	2.5	3.5	0.15	0.15	385	127	39	13
MR82X	-	-	-	2.5	8	2.5	-	0.2	-	560	179	57	18
602X	602XZZ	-	-	2.5	8	2.8	4	0.15	0.15	550	175	56	18
MR63	MR63ZZ	-	-	3	6	2	2.5	0.1	0.1	208	74	21	7.5
683A	683AZZ	-	-	3	7	2	3	0.1	0.1	390	130	40	13
MR83	-	-	-	3	8	2.5	-	0.15	-	560	179	57	18
693	693ZZ	-	-	3	8	3	4	0.15	0.15	560	179	57	18
MR93	MR93ZZ	-	-	3	9	2.5	4	0.2	0.15	570	187	58	19
603	603ZZ	-	-	3	9	3	5	0.15	0.15	570	187	58	19
623	623ZZ	-	-	3	10	4	4	0.15	0.15	630	218	64	22
633	633ZZ1	-	-	3	13	5	5	0.2	0.2	130	485	133	49
MR74	-	-	-	4	7	2	-	0.1	-	310	115	32	12
MR74Z	MR74ZZ	-	-	4	7	-	2.5	-	0.1	255	107	26	11
MR84	MR84ZZ	-	-	4	8	2	3	0.15	0.1	395	139	40	14
684A	684AZZ1	-	-	4	9	2.5	4	(0.15)^*1	(0.15)^*1	640	225	65	23
MR104	R104BZZ	-	-	4	10	3	4	0.2	0.15	710	270	73	28
694	694ZZ	-	-	4	11	4	4	0.15	0.15	960	345	98	35
604	604ZZ	-	-	4	12	4	4	0.2	0.2	960	345	98	35
624	624ZZ1	-	-	4	13	5	5	0.2	0.2	130	485	133	49
634	634ZZ1	-	-	4	16	5	5	0.3	0.3	173	670	177	68

(^*1) Values in ( ) do not comply with JIS B 1521.
The reference for the basic dynamic load rating for stainless steel products is multiplied by a factor of 0.85.

Part Number Open Type	Allowable rotational speed (min⁻¹)		Mounting dimensions (mm)						Mass (g) (Reference)
	Grease Lubrication Open Type Z/ZZ	Oil Lubrication Open Type z

			DA Minimum	Db Maximum	Da Maximum	Db Minimum	r_a Maximum	r_b Maximum	Open type	Shield Shape
			DA Minimum	Db Maximum	Da Maximum	Db Minimum	r_a Maximum	r_b Maximum	Open type	Shield Shape
681	130,000	150,000	1.4	-	2.6	-	0.05	-	0.03	-
MR31	130,000	150,000	1.4	-	2.6	-	0.05	-	0.04	-
691	100,000	120,000	1.8	-	3.2	-	0.10	-	0.09	-
MR41X	110,000	130,000	2.0	1.9	3.2	3.5	0.10	0.10	0.10	0.14
681X	100,000	120,000	1.9	2.1	3.6	3.6	0.05	0.05	0.07	0.11
691X	85,000	100,000	2.7	2.5	3.8	4.3	0.15	0.15	0.17	0.20
601X	75,000	90,000	2.7	3.0	4.8	5.4	0.15	0.15	0.33	0.38
682	85,000	100,000	2.6	2.7	4.4	4.2	0.08	0.08	0.12	0.17
MR52B	85,000	100,000	2.8	2.7	4.2	4.4	0.10	0.10	0.16	0.23
692	75,000	90,000	3.2	3.0	4.8	5.4	0.15	0.15	0.28	0.38
MR62	75,000	90,000	3.2	3.0	4.8	5.4	0.15	0.15	0.30	0.29
MR72	63,000	75,000	3.2	3.8	5.8	6.2	0.15	0.15	0.45	0.49
602	63,000	75,000	3.2	3.8	5.8	6.2	0.15	0.15	0.51	0.58
682X	71,000	80,000	3.1	3.7	5.4	5.4	0.08	0.08	0.23	0.29
692X	63,000	75,000	3.7	3.8	5.8	6.2	0.15	0.15	0.41	0.55
MR82X	60,000	67,000	4.1	-	6.4	-	0.20	-	0.56	-
602X	60,000	71,000	3.7	4.1	6.8	7.0	0.15	0.15	0.63	0.83
MR63	71,000	80,000	3.8	3.7	5.2	5.4	0.10	0.10	0.20	0.27
683A	63,000	75,000	3.8	4.0	6.2	6.4	0.10	0.10	0.32	0.45
MR83	60,000	67,000	4.2	-	6.8	-	0.15	-	0.54	-
693	60,000	67,000	4.2	4.3	6.8	7.3	0.15	0.15	0.61	0.83
MR93	56,000	67,000	4.6	4.3	7.4	7.9	0.20	0.15	0.73	1.18
603	56,000	67,000	4.2	4.3	7.8	7.9	0.15	0.15	0.87	1.45
623	50,000	60,000	4.2	4.3	8.8	8.0	0.15	0.15	1.65	1.66
633	40,000	48,000	4.6	6.0	11.4	11.3	0.20	0.20	3.38	3.33
MR74	60,000	67,000	4.8	-	6.2	-	0.10	-	0.22	-
MR74	60,000	71,000	-	4.8	-	6.3	-	0.10	-	0.29
MR84	56,000	67,000	5.2	5.0	6.8	7.4	0.15	0.10	0.36	0.56
684A	53,000	63,000	4.8	5.2	8.2	8.1	0.10	0.10	0.63	1.01
MR104B	50,000	60,000	5.6	5.9	8.4	8.8	0.20	0.15	1.04	1.42
694	48,000	56,000	5.2	5.6	9.8	9.9	0.15	0.15	1.70	1.75
604	48,000	56,000	5.6	5.6	10.4	9.9	0.20	0.20	2.25	2.29
624	40,000	48,000	5.6	6.0	11.4	11.3	0.20	0.20	3.03	3.04
634	36,000	43,000	6.0	7.5	14.0	13.8	0.30	0.30	5.24	5.21

600 type / MR type
Inner diameter 5–9 mm

Nominal number				Main Dimensions (mm)						Standard rated load
Open type	Shield Shape	Seal Type		d	D	B	B₁	r^(*1) Minimum	r₁^(*1) Minimum	(N)		N (kgf)
Open type	Shield Shape	Seal Type		d	D	B	B₁	r^(*1) Minimum	r₁^(*1) Minimum	C_r	C_or	C_r	C_or
MR85	-	-	-	5	8	2	-	0.10	-	310	120	31	12
-	MR85ZZ	-	-	5	8	-	2.5	-	0.10	278	131	28	13
MR95	MR95ZZ1	-	-	5	9	2.5	3	0.15	0.15	430	168	44	17
MR105	MR105ZZ	-	-	5	10	3	4	0.15	0.15	430	168	44	17
-	MR115ZZ	VV	-	5	11	-	4	-	0.15	715	276	73	28
685	685ZZ	-	-	5	11	3	5	0.15	0.15	715	281	73	29
695	695ZZ1	VV	DD	5	13	4	4	0.20	0.20	1080	430	110	44
605	605ZZ	DD	-	5	14	5	5	0.20	0.20	1330	505	135	52
625	625ZZ1	VV	DD	5	16	5	5	0.30	0.30	1730	670	177	68
635	635ZZ1	VV	DD	5	19	6	6	0.30	0.30	2340	885	238	90
MR106	MR106ZZ1	-	-	6	10	2.5	3	0.15	0.10	495	218	51	22
MR126	MR126ZZ	DD	-	6	12	3	4	0.20	0.15	715	292	73	30
686A	686AZZ1	VV	DD	6	13	3.5	5	0.15	0.15	1080	440	110	45
696	696ZZ1	VV	DD	6	15	5	5	0.20	0.20	1730	670	177	68
606	606ZZ1	VV	DD	6	17	6	6	0.30	0.30	2260	835	231	85
626	626ZZ1	VV	DD	6	19	6	6	0.30	0.30	2340	885	238	90
636	636ZZ	VV	DD	6	22	7	7	0.30	0.30	3300	1370	335	140
MR117	MR117ZZ	-	-	7	11	2.5	3	0.15	0.10	455	201	47	21
MR137	MR137ZZ	-	-	7	13	3	4	0.20	0.15	540	276	55	28
687	687ZZ1	VV	DD	7	14	3.5	5	0.15	0.15	1170	510	120	52
697	697ZZ1	VV	DD	7	17	5	5	0.30	0.30	1610	710	164	73
607B	60713ZZ1	VV	DD	7	19	6	6	0.30	0.30	2340	885	238	90
627	627ZZ	VV	DD	7	22	7	7	0.30	0.30	3300	1370	335	140
637	637ZZ1	VV	DD	7	26	9	9	0.30	0.30	4550	1970	465	201
MR128	MR128ZZ1	-	-	8	12	2.5	3.5	0.15	0.10	545	274	56	28
MR148	MR148ZZ	VV	DD	8	14	3.5	4	0.20	0.15	820	385	83	39
688A	688AZZ1	VV	DD	8	16	4	5	0.20	0.20	1610	710	164	73
698	698ZZ1	VV	DD	8	19	6	6	0.30	0.30	2240	910	228	93

(^*1) Values in ( ) do not comply with JIS B 1521.
The reference for the basic dynamic load rating for stainless steel products is multiplied by a factor of 0.85.

Part Number Open type	Allowable rotational speed (min⁻¹)			Mounting dimensions (mm)						Weight (g) (Reference)
	Grease Lubrication Open type Z/ZZ	D·DD	Oil Lubrication Open type z

				d_a Minimum	db Maximum	D_a Maximum	D_b Minimum	r_a Maximum	r_b Maximum	Open type	Shield Shape
				d_a Minimum	db Maximum	D_a Maximum	D_b Minimum	r_a Maximum	r_b Maximum	Open type	Shield Shape
MR85	53000	-	63,000	5.8	-	7.2	-	0.10	-	0.26	-
MR85	53,000	-	63,000	-	5.8	-	7.4	-	0.10	-	0.34
MR95	50,000	-	60,000	6.2	6.0	7.8	8.2	0.15	0.15	0.50	0.58
MR105	50,000	-	60,000	6.2	6.0	8.8	8.4	0.15	0.15	0.95	1.29
MR115	48,000	-	56,000	-	6.3	-	9.8	-	0.15	-	1.50
685	45,000	-	53,000	6.2	6.2	9.8	9.9	0.15	0.15	1.20	1.96
695	43,000	40,000	50,000	6.6	6.6	11.4	11.2	0.20	0.20	2.45	2.50
605	40,000	38,000	50,000	6.6	6.9	12.4	12.2	0.20	0.20	3.54	3.48
625	36,000	32,000	43,000	7.0	7.5	14.0	13.8	0.30	0.30	4.95	4.86
635	32,000	30,000	40,000	7.0	8.5	17.0	16.5	0.30	0.30	8.56	8.34
MR106	45000	-	53,000	7.2	7.0	8.8	9.3	0.15	0.10	0.56	0.68
MR126	43,000	40,000	50,000	7.6	7.2	10.4	10.9	0.20	0.15	1.27	1.74
686A	40,000	38,000	50,000	7.2	7.4	11.8	11.7	0.15	0.15	1.91	2.69
696	40,000	36,000	45,000	7.6	7.9	13.4	13.3	0.20	0.20	3.88	3.72
606	38,000	34,000	45,000	8.0	8.2	15.0	14.8	0.30	0.30	5.97	6.08
626	32,000	30,000	40,000	8.0	8.5	17.0	16.5	0.30	0.30	8.15	7.94
636	30000	28,000	36,000	8.0	10.5	20.0	19.0	0.30	0.30	14.00	14.00
MR117	43,000	-	50,000	8.2	8.0	9.8	10.5	0.15	0.10	0.62	0.72
MR137	40,000	-	48,000	8.6	9.0	11.4	11.6	0.20	0.15	1.58	2.02
687	40,000	34,000	45,000	8.2	8.5	12.8	12.7	0.15	0.15	2.13	2.97
697	36000	28,000	43,000	9.0	10.2	15.0	14.8	0.30	0.30	5.26	5.12
607	36,000	32,000	43,000	9.0	9.1	17.0	16.5	0.30	0.30	7.67	7.51
627	30000	28,000	36,000	9.0	10.5	20.0	19.0	0.30	0.30	12.7	12.9
637	28,000	22,000	34,000	9.0	12.8	24.0	22.8	0.30	0.30	24.00	25.00
MR128	40,000	-	48,000	9.2	9.0	10.8	11.3	0.15	0.10	0.71	0.97
MR148	38,000	32,000	45,000	9.6	9.2	12.4	12.8	0.20	0.15	1.86	2.16
688A	36000	28,000	43,000	9.6	10.2	14.4	14.2	0.20	0.20	3.12	4.02
698	36,000	28,000	43,000	10.0	10.0	17.0	16.5	0.30	0.30	7.23	7.18

F600 type / MF type
Inner diameter 1 to 4 mm

Part number				Main Dimensions (mm)										Standard rated load
Open type	Shield Shape	Seal Type		d	D	D₁	D₂	B	B₁	C₁	C₂	r^(*1) Minimum	r₁^(*1) Minimum	(N)		N (kgf)
Open type	Shield Shape	Seal Type		d	D	D₁	D₂	B	B₁	C₁	C₂	r^(*1) Minimum	r₁^(*1) Minimum	C_r	C_or	C_r	C_or
F681	-	-	-	1	3	3.8	-	1.0	-	0.3	-	0.05	-	80	23	8	2.5
F691	-	-	-	1	4	5.0	-	1.6	-	0.5	-	0.10	-	138	35	14	3.5
MF41X	-	-	-	1.2	4	48.0	-	1.8	-	04	-	01	-	138	35	14	35
F681X	F681XZZ	-	-	1.5	4	5.0	5.0	1.2	2.0	0.4	0.6	0.05	0.05	112	33	11	3.5
F691X	F691XZZ	-	-	1.5	5	6.5	6.5	2.0	2.6	0.6	0.8	0.15	0.15	237	69	24	7
F601X	F601XZZ	-	-	1.5	6	7.5	7.5	2.5	3.0	0.6	0.8	0.15	0.15	330	98	34	10
F682	F682ZZ	-	-	2	5	6.1	6.1	1.5	2.3	0.5	0.6	0.08	0.08	169	50	17	5
MF52B	MF52BZZ	-	-	2	5	6.2	6.2	2.0	2.5	0.6	0.6	0.10	0.10	187	58	19	6
F692	F692ZZ	-	-	2	6	75.0	75.0	2.3	3.0	06	08	015	015	330	98	34	10
MF62	-	-	-	2	6	7.2	-	2.5	-	0.6	-	0.15	-	330	98	34	10
MF72	MF72ZZ	-	-	2	7	8.2	8.2	2.5	3.0	0.6	0.6	0.15	0.15	385	127	39	13
F602	F602ZZ	-	-	2	7	8.5	8.5	2.8	3.5	0.7	0.9	0.15	0.15	385	127	39	13
F682X	F682XZZ	-	-	2.5	6	7.1	7.1	1.8	2.6	0.5	0.8	0.08	0.08	208	74	21	7.5
F692X	F692XZZ	-	-	2.5	7	8.5	8.5	2.5	3.5	0.7	0.9	0.15	0.15	385	127	39	13
MF82X	-	-	-	2.5	8	92.0	-	2.5	-	06	-	02	-	560	179	57	18
F602X	F602XZZ	-	-	2.5	8	9.5	9.5	2.8	4.0	0.7	0.9	0.15	0.15	550	175	56	18
MF63	MF63ZZ	-	-	3	6	7.2	7.2	2.0	2.5	0.6	0.6	0.10	0.10	208	74	21	7.5
F683A	F683AZZ	-	-	3	7	8.1	8.1	2.0	3.0	0.5	0.8	0.10	0.10	390	130	40	13
MF83	-	-	-	3	8	9.2	-	2.5	-	0.6	-	0.15	-	560	179	57	18
F693	F693ZZ	-	-	3	8	9.5	9.5	3.0	4.0	0.7	0.9	0.15	0.15	560	179	57	18
MF93	MF93ZZ	-	-	3	,	10.2	10.6	2.5	4.0	0.6	0.8	0.20	0.15	570	187	58	19
F603	F603ZZ	-	-	3	,	10.5	10.5	3.0	5.0	0.7	1.0	0.15	0.15	570	187	58	19
F623	F623ZZ	-	-	3	10	11.5	11.5	4.0	4.0	1.0	1.0	0.15	0.15	630	218	64	22
MF74	-	-	-	4	7	8.2	-	2.0	-	0.6	-	0.10	-	310	115	32	12
-	MF74ZZ	-	-	4	7	-	8.2	-	2.5	-	0.6	-	0.10	255	107	26	11
MF84	MF84ZZ	-	-	4	8	9.2	9.2	2.0	3.0	0.6	0.6	0.15	0.10	395	139	40	14
F684	F684ZZ	-	-	4	,	10.3	10.3	2.5	4.0	0.6	1.0	(0.15^{) (*1)}	(0.15^{) (*1)}	640	225	65	23
MF104B	MF104BZZ	-	-	4	10	11.2	11.6	3.0	4.0	0.6	0.8	0.20	0.15	710	270	73	28
F694	F694ZZ	-	-	4	11	12.5	12.5	4.0	4.0	1.0	1.0	0.15	0.15	960	345	98	35
F604	F604ZZ	-	-	4	12	135.0	13.5	4.0	4.0	1.0	1.0	0.20	0.20	960	345	98	35
F624	F624ZZ1	-	-	4	13	15.0	15.0	5.0	5.0	1.0	1.0	0.20	0.20	1300	485	133	49
F634	F634ZZ1	-	-	4	16	18.0	18.0	5.0	5.0	1.0	1.0	0.30	0.30	1730	670	177	68

(^*1) Values in ( ) do not comply with JIS B 1521.
The reference for the basic dynamic load rating for stainless steel products is multiplied by a factor of 0.85.

Part number Open type	Allowable rotational speed (min⁻¹)		Mounting dimensions (mm)				Weight (g) (Reference)
	grease lubrication open type Z/ZZ	Oil Lubrication Open Type z	d_a Minimum	db Maximum	r_a Maximum	r_b Maximum	Open type	Shield Shape
	grease lubrication open type Z/ZZ	Oil Lubrication Open Type z	d_a Minimum	db Maximum	r_a Maximum	r_b Maximum	Open type	Shield Shape
F681	130,000	150,000	1.4	-	0.05	-	0.04	-
F691	100,000	120,000	1.8	-	0.10	-	0.14	-
MF41X	110,000	130,000	2.0	-	0.10	-	0.12	-
F681X	100,000	120000	1.9	2.1	0.05	0.05	0.09	0.14
F691X	85,000	100,000	2.7	2.5	0.15	0.15	0.21	0.28
F601X	75,000	90,000	2.7	3.0	0.15	0.15	0.42	0.52
F682	85,000	100,000	2.6	2.7	0.08	0.08	0.16	0.22
MF52B	85,000	100,000	2.8	2.7	0.10	0.10	0.21	0.27
F692	75,000	90,000	3.2	3.0	0.15	0.15	0.35	0.48
MF62	75,000	90,000	3.2	-	0.15	-	0.36	-
MF72	63000	75000	3.2	3.8	0.15	0.15	0.52	0.56
F602	63000	75000	3.2	3.8	0.15	0.15	0.60	0.71
F682X	71,000	80,000	3.1	3.7	0.08	0.08	0.25	0.36
F692X	63,000	67,000	3.7	3.8	0.15	0.15	0.51	0.68
MF82X	60,000	71,000	4.1	-	0.20	-	0.62	-
F602X	60,000	71,000	3.7	4.1	0.15	0.15	0.74	0.98
MF63	71000	80000	3.8	3.7	0.10	0.10	0.27	0.33
F683A	63000	75,000	3.8	4.0	0.10	0.10	0.37	0.53
MF83	60,000	67,000	4.2	-	0.15	-	0.56	-
F693	60,000	67,000	4.2	4.3	0.15	0.15	0.70	0.97
MF93	56000	67,000	4.6	4.3	0.20	0.15	0.81	1.34
F603	56,000	67,000	4.2	4.3	0.15	0.15	1.00	1.63
F623	50,000	60000	4.2	4.3	0.15	0.15	1.85	1.86
MF74	60,000	67,000	4.8	-	0.10	-	0.29	-
MF74	60,000	71,000	-	4.8	-	0.10	-	0.35
MF84	56,000	67,000	5.2	5.0	0.15	0.10	0.44	0.63
F684	53,000	63,000	4.8	5.2	0.10	0.10	0.70	1.14
MF104B	50,000	60,000	5.6	5.9	0.20	0.15	1.13	1.59
F694	48,000	56,000	5.2	5.6	0.15	0.15	1.91	1.96
F604	48,000	56,000	5.6	5.6	0.20	0.20	2.53	2.53
F624	40,000	48,000	5.6	6	0.20	0.20	3.38	3.53
F634	36,000	43,000	6	7.5	0.30	0.30	5.73	5.65

F600 type / MF type
Inner diameter 5 to 9 mm

Part number				Main Dimensions (mm)										Standard rated load
Open type	Shield Shape	Seal Type		d	D	D₁	D₂	B	B₁	C₁	C₂	r^(*1) Minimum	r₁^(*1 Min.	(N)		N (kgf)
Open type	Shield Shape	Seal Type		d	D	D₁	D₂	B	B₁	C₁	C₂	r^(*1) Minimum	r₁^(*1 Min.	C_r	C_or	C_r	C_or
MF85	-	-	-	5	8	9.2	-	2.0	-	0.6	-	0.10	-	310	120	31	12
-	MF85ZZ	-	-	5	8	-	9.2	-	2.5	-	0.6	-	0.10	278	131	28	13
MF95	MF95ZZ	-	-	5	9	102.0	102.0	2.5	3.0	06	06	015	0.15	430	168	44	17
MF105	MF105ZZ	-	-	5	10	11.2	11.6	3.0	4.0	0.6	0.8	0.15	0.15	430	168	44	17
F685	F685ZZ	-	-	5	11	12.5	12.5	3.0	5.0	0.8	1.0	0.15	0.15	715	281	73	29
F695	F695ZZ1	VV	DD	5	13	15.0	15.0	4.0	4.0	1.0	1.0	0.20	0.20	1080	430	110	44
F605	F605ZZ	DD	DD	5	14	16.0	16.0	5.0	5.0	1.0	1.0	0.20	0.20	1330	505	135	52
F625	F625ZZ1	VV	DD	5	16	18.0	18.0	5.0	5.0	1.0	1.0	0.30	0.30	1730	670	177	68
F635	F635ZZ1	VV	DD	5	19	22.0	22.0	6.0	6.0	15.0	15.0	030	0.30	2340	885	238	90
MF106	MF106ZZ1	-	-	6	10	11.2	11.2	2.5	3.0	0.6	0.6	0.15	0.10	495	218	51	22
MF126	MF126ZZ	DD	DD	6	12	13.2	13.6	3.0	4.0	0.6	0.8	0.20	0.15	715	292	73	30
F686A	F686AZZ1	VV	DD	6	13	15.0	15.0	3.5	5.0	1.0	1.1	0.15	0.15	1080	440	110	45
F696	F696ZZ1	VV	DD	6	15	17.0	17.0	5.0	5.0	1.2	1.2	0.20	0.20	1730	670	177	68
F606	F606ZZ	VV	DD	6	17	19.0	19.0	6.0	6.0	1.2	1.2	0.30	0.30	2260	835	231	85
F626	F626ZZ1	VV	DD	6	19	22.0	22.0	6.0	6.0	15.0	15.0	030	0.30	2340	885	238	90
F636	F636ZZ	VV	DD	6	22	25.0	25.0	7.0	7.0	1.5	1.5	0.30	0.30	3300	1370	335	140
MF117	MF117ZZ	-	-	7	11	12.2	12.2	2.5	3.0	0.6	0.6	0.15	0.10	455	201	47	21
MF137	MF137ZZ	-	-	7	13	14.2	14.6	3.0	4.0	0.6	0.8	0.20	0.15	540	276	55	28
F687	F687ZZ1	VV	DD	7	14	16.0	16.0	3.5	5.0	1.0	1.1	0.15	0.15	1170	510	120	52
F697	F697ZZ1	VV	DD	7	17	19.0	19.0	5.0	5.0	1.2	1.2	0.30	0.30	1610	710	164	73
F607	F607ZZ1	VV	DD	7	19	22.0	22.0	6.0	6.0	1.5	1.5	0.30	0.30	2340	885	238	90
F627	F627ZZ	VV	DD	7	22	25.0	25.0	7.0	7.0	1.5	1.5	0.30	0.30	3300	1370	335	140
MF128	MF128ZZ1	-	-	8	12	13.2	13.6	2.5	3.5	0.6	0.8	0.15	0.10	545	274	56	28
MF148	MF148ZZ	VV	DD	8	14	15.6	15.6	3.5	4.0	0.8	0.8	0.20	0.15	820	385	83	39
F688A	F688AZZ1	VV	DD	8	16	18.0	18.0	4.0	5.0	1.0	1.1	0.20	0.20	1610	710	164	73
F698	F698ZZ1	VV	DD	8	19	22.0	22.0	6.0	6.0	1.5	1.5	0.30	0.30	2240	910	228	93

(^*1) Values in ( ) do not comply with JIS B 1521.
The reference for the basic dynamic load rating for stainless steel products is multiplied by a factor of 0.85.

Part number Open type	Allowable rotational speed (min⁻¹)			Mounting dimensions (mm)				Weight (g) (Reference)
	Grease Lubrication Open type Z/ZZ	D·DD	Oil Lubrication Open Type z

				d_a Minimum	db Maximum	r_a Maximum	r_b Maximum	Open type	Shield Shape
				d_a Minimum	db Maximum	r_a Maximum	r_b Maximum	Open type	Shield Shape
MF85	53,000	-	63,000	5.8	-	0.10	-	0.33	-
MF85	53,000	-	63,000	-	5.8	-	0.10	0.41	0.41
MF95	50,000	-	60,000	6.2	6.0	0.15	0.15	0.59	0.66
MF105	50,000	-	60,000	6.2	6.0	0.15	0.15	1.05	1.46
F685	45,000	-	53,000	6.2	6.2	0.15	0.15	1.37	2.18
F695	43,000	40,000	50,000	6.6	6.6	0.20	0.20	2.79	2.84
F605	40,000	38,000	50,000	6.6	6.9	0.20	0.20	3.90	3.85
F625	36,000	32,000	43,000	7.0	7.5	0.30	0.30	5.37	5.30
F635	32,000	30,000	40,000	7.0	8.5	0.30	0.30	9.49	9.49
MF106	45,000	-	53,000	7.2	7.0	0.15	0.10	0.65	0.77
MF126	43,000	40,000	50,000	7.6	7.2	0.20	0.15	1.38	1.94
F686A	40,000	38,000	50,000	7.2	7.4	0.15	0.15	2.25	3.04
F696	40,000	36,000	45,000	7.6	7.9	0.20	0.20	4.34	4.26
F606	38,000	34,000	45,000	8.0	8.2	0.30	0.30	6.58	6.61
F626	32,000	30,000	40,000	8.0	8.5	0.30	0.30	9.09	9.09
F636	30,000	28,000	36,000	8.0	10.5	0.30	0.30	14.6	4.70
MF117	43,000	-	50,000	8.2	8.0	0.15	0.10	0.72	0.82
MF137	40000	-	48,000	8.6	9.0	0.20	0.15	1.70	2.23
F687	40,000	34,000	45,000	8.2	8.5	0.15	0.15	2.48	3.37
F697	36,000	28,000	43,000	9.0	10.2	0.30	0.30	5.65	5.65
F607	36,000	32,000	43,000	9.0	9.1	0.30	0.30	8.66	8.66
F627	30,000	28,000	36,000	9.0	10.5	0.30	0.30	14.2	4.20
MF128	40,000	-	48,000	9.2	9.0	0.15	0.10	0.82	1.15
MF148	38,000	32,000	45,000	9.6	9.2	0.20	0.15	2.09	2.39
F688A	36,000	30,000	43,000	9.6	10.2	0.20	0.20	3.54	4.47
F698	36,000	28,000	43,000	10.0	10.0	0.30	0.30	8.35	8.30

SMT type
Inner diameter 10 to 15 mm

Part number	Main Dimensions (mm)				Standard rated load
	d	D	B	r^(*1) Minimum	(N)		N (kgf)
	d	D	B	r^(*1) Minimum	C_r	C_or	C_r	C_or
SMT1510	10	15	3	0.15	815	410	83	42
SMT2015	15	20	3.5	0.15	800	470	82	48

Part number	Allowable rotational speed (min⁻¹)		Mounting dimensions (mm)			Weight (g) (Reference)
	Grease Lubrication Open type Z/ZZ	Oil Lubrication Open Type z	Mounting dimensions (mm)
			d_a Minimum	db Maximum	r_a Maximum
			d_a Minimum	db Maximum	r_a Maximum
SMT1510	36,000	43,000	11.2	13.8	0.15	1.40
SMT2015	30,000	36,000	16.2	18.8	0.15	2.20

The standard material for thin-walled short-row deep groove ball bearings is stainless steel.
The applicable accuracy grades are JIS 0 and 6.
JIS is applied for the radial clearance.

High-quality small-diameter bearings

Dimensional range of small-diameter bearings

Category Design	Small-Diameter Bearing Extra small ball bearings
Metric System Metric	Nominal bearing outer diameter D ≥ 9 Outside diameter D ≥ 9 Nominal bearing inner diameter d < 10 Bare diameter d < 10
Inch Series Inch	Nominal bearing outer diameter D ≥ 9.525 Outside diameter D ≥ 9.525 Nominal bearing inner diameter d < 10 Bare diameter d < 10

Usage Example

Preload

A preload is a state in which 2 bearings capable of receiving an axial load are installed in a pair so that a load F (preload) in the axial direction is always applied in advance. Bearings have an internal clearance, but this clearance disappears when preload is applied, allowing the balls and races to come into elastic contact. As a result, the bearing does not rattle due to the clearance, and vibration and noise during rotation can be suppressed. It also increases the rigidity of the bearing.
* If the preload is too large, it will cause an increase in the frictional moment, heat generation, seizure, etc., so it is necessary to appropriately select the amount and method of preload according to the application.

Effect of preload

Small-Diameter Bearing (Open Type, Double Shielded, Rubber Seal Type):Related images

Example of preload effect

1. Accurate positioning of the shaft in the radial and axial directions and suppresses shaft runout.
2. Increase the rigidity of the bearing.
3. Prevents noise caused by axial vibration and resonance.
4. Suppresses ball revolution slip and rotation slip during high-speed rotation.
5. In thrust bearings, the rolling elements are kept in the correct position with respect to the bearing rings.

Preload method

Example of constant pressure preload

A method of applying an appropriate preload to the bearing using a coil spring, disc spring, etc. Even if the relative position of the bearing changes during use, the amount of preload can be kept almost constant. For example, it is less susceptible to dimensional changes, etc., due to temperature. However, it requires space and parts for mounting the spring element. Rigidity is low compared to fixed position preload.

Fixed position preload

Example of fixed position preload

A method of setting the amount of preload by determining the position between the facing bearings. For example, based on the relationship between axial load and axial displacement, the displacement corresponding to the axial load is set according to the spacer dimensions and bearing width dimensions, and the bearing is fixed. The rigidity is high. However, the amount of preload changes due to dimensional changes against the temperature.

Preload magnitude and direction

Back-to-back arrangement (DB) example

Example of face-to-face arrangement (DF)

Since the amount of preload determines the state of elastic contact between the balls and raceway, if the amount of preload is increased more than necessary, abnormal heat generation, increased frictional moment, and reduced fatigue lifespan will result. On the other hand, if it is too small, it may cause vibration due to lack of rigidity or loss of preload due to external load. Based on their experience, the manufacturer recommends using about 0.5% of Cr for compact motors and other applications that require long-term durability, and about 1% of Cr for general applications that require rigidity, such as machine parts. In addition to preload, it should be determined by taking into consideration the effects of external loads, self-weight, etc.
There are 2 types of preload directions: back-to-back (DB) and face-to-face (DF). The back-to-back arrangement has high rigidity when a moment load is applied. However, if the housing accuracy is poor and there is mounting error (misalignment), the internal load tends to increase. The face-to-face arrangement has relatively low rigidity against moment loads, but is less susceptible to misalignment such as housing accuracy and shaft deflection.

■ Dimensional tolerance (Class 0)

d Inner diameter tolerance

d (mm)		Inner diameter tolerance (mm)
Over	or less	Inner diameter tolerance (mm)
0.6	2.5	0 -0.008
2.5	10	0 -0.008
10	18	0 -0.008
18	30	0 -0.010

D Outer diameter tolerance

D (mm)		Outer diameter tolerance (mm)
Over	or less	Outer diameter tolerance (mm)
2.5	6	0 -0.008
6	18	0 -0.008
18	30	0 -0.009
30	50	0 -0.011

B Width tolerance, C Flange width tolerance

d (mm)		B Width tolerance C Flange width tolerance (mm)
Over	or less	B Width tolerance C Flange width tolerance (mm)
0.6	2.5	0 -0.040
2.5	10	0 -0.120
10	18	0 -0.120
18	30	0 -0.120

D1 Flange outer diameter tolerance

D1 (mm)		Flange outer diameter tolerance (mm)
Over	or less	Flange outer diameter tolerance (mm)
6	10	0.220 -0.036
6	10	0.220 -0.036
10	18	0.270 -0.043
10	18	0.270 -0.043
18	30	0.330 -0.052
18	30	0.330 -0.052
30	50	0.390 -0.062
30	50	0.390 -0.062

"!" Tolerance dimensions comply to JIS (JIS B 1514-1 2017)

■General standard for fitting (Overview)

·Shaft

Radial bearing (Class 0, 6X, 6)					MISUMI Product
Conditions		Ball bearing		Shaft tolerance zone class
Conditions		Shaft diameter (mm)
Load characteristics	Load size, etc.	Over	or less
Inner ring Rotational load Direction Variable load	Light load Fluctuating dynamic load	—	18	h5	Shaft
		18	100	js6	—
		100	200	k6	—
	Normal load	—	18	js5	—
		18	100	k5	—
		100	140	m5	—
Inner ring Static Load	Inner ring must be able to move easily on shaft	Overall shaft diameter		g6	shaft rotary shaft
Inner ring Static Load	Inner ring does not need to move easily on shaft	Overall shaft diameter		h6	—

·Housing

Radial bearing (Class 0, 6X, 6)
Conditions			Housing tolerance zone class	Housing
Load characteristics	Load size, etc.	Outer ring axial movement	Housing tolerance zone class	Housing
Outer ring Static Load	Each load (light, medium, heavy)	easy to move	H7	Integrated double split
	The shaft and inner ring become hot	easy to move	G7	Integrated double split
	Requires precision rotation with light and normal loads	Usually unable to move	K6	Integrated
	Requires precision rotation with light and normal loads	Capable to move	JS6
	requires quiet operation	easy to move	H6
Direction Variable load	light load, normal load	Usually capable to move	JS7
	Normal load, heavy load	Usually unable to move	K7
	large impact load	Unable to move	M7
Outer ring Rotational load	Light load, dynamic load	Unable to move	M7
	Normal load, heavy load	Unable to move	N7
	Heavy load with thin-walled housing	Unable to move	P7

[!] Based on JIS B 1566 (2015) Annex B (reference).

[ ! ]Load position
·Inner ring rotational load: The load position on the inner ring changes.
·Inner ring static load: The load position on the inner ring does not change.
·Outer ring rotational load: The load position on the outer ring changes.
·Stationary load on outer ring: The load position on the outer ring does not change.
·Directionally variable load: Load position is variable.

[ ! ]Type of load
·Light load: 6% or less of the basic dynamic rated load.
·Normal load: Exceeding 6% of the basic dynamic rated load and up to 12%.
·Heavy load: Exceeds 12% of basic dynamic rated load.

: 30; 45; 60

Part Number
634U

Part Number	Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	Inner Diameter d (Ø)	Outer Diameter D (Ø)	Width B 1 (mm)	Bearing Type	Outer Ring Type	Materials of Inner and Outer Ring	Basic Load Rating Dynamic Rating (N)	Rolling Element Material	Revolution Frequency (rpm)	Basic Load Rating Static Rating (N)	Sealing Structure	Lubricant
	MYR 8.98	1 Piece(s)	Available	10 Day(s) or more	4	16	5	Open Type	Flat	Steel	1730	Steel	43000	670	Open Type	Aero, Shell Fluid 12 (oil)

Product TOP

Basic Information

Bearing Ring Shape	Ball	Specifications/Environment	Standard	Precision (JIS)	Grade 0
Load Direction	Radial	Size Standard	Metric System	Number of Bearing Ring Rows	Single Row
Internal Clearance Symbol	MC3

Please check the type/dimensions/specifications of the part 634U in the Small-Diameter Bearing (Open Type, Double Shielded, Rubber Seal Type) series.

Configure

1 Part Numbers

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Configure Remaining Specifications

Completed

Specification/Dimensions

type
- 6□□
- F6□□
- MF
- MR
- MT
- SMF
- SMR
- SMT
Clear
Inner Diameter d(Ø)
1

1.5

2

2.5

3

4

5

6

7

8

10
Clear
Outer Diameter D(Ø)
3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

19
Clear
Width B 1(mm)
1

1.2

1.5

1.8

2

2.3

2.5

2.6

3

3.5

4

5

6
Clear
Bearing Type
- Open Type
- Double Shielded
- Rubber Sealed
Clear
Outer Ring Type
- Flat
- Flanged
Clear
Materials of Inner and Outer Ring
- Steel
- Stainless Steel
Clear
Basic Load Rating Dynamic Rating(N)
68

95

112

144

159

169

177

187

208

217

236

237

255

278

281

310

327

330

332

366

385

387

390

421

430

438

455

459

463

476

485

495

536

540

544

545

560

570

604

608

630

640

697

710

715

815

816

820

918

950

960

995

1080

1105

1131

1170

1300

1330

1369

1471

1610

1730

1904

1921

1989

2240

2260

2340
Clear
Rolling Element Material
- Steel
- Stainless Steel
Clear
Sealing Structure
- Double Contact Sealed
- Double steel plate shield
- Open Type
Clear
Lubricant
- Aero, Shell Fluid 12 (oil)
- NS Hairyu-bu Grease
Clear
CAD
- 2D
Clear

Days to Ship

All

1 Day(s) or Less

2 Day(s) or Less

4 Day(s) or Less

6 Day(s) or Less

10 Day(s) or Less

11 Day(s) or Less

12 Day(s) or Less

18 Day(s) or Less

22 Day(s) or Less

28 Day(s) or Less
Clear

Specify Alterations

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Frequently asked question (FAQ)

Question: What are the types of seals and shields used in deep groove ball bearings?: Answer: Open Type: No seals or shields, suitable for general use with periodic lubrication.
Shielded Type (ZZ,): Non-contact metal shields protect against debris while maintaining low friction.
Contact Sealed Type (DD): Contact seals provide excellent dust and water resistance.
Question: What are the standard dimensions and tolerances for deep groove ball bearings?: Answer: Inner Diameter (d): Ranges from 1 mm to 10 mm.
Outer Diameter (D): Sizes span 3 mm to 19 mm.
Width (B): Varies from 1 mm to 6 mm, depending on the series.
Precision: JIS Grade 0
Question: What types of lubrication are suitable for deep groove ball bearings?: Answer: Sealed bearings other than open type bearings are filled with an appropriate amount of grease. Li grease (Polyol ester + Diester is used for general bearings. When applying grease at maintenance, use the same type of grease.
For open type bearings, be sure to use grease suitable for the operating environment.
If you need further information, please refer to below link.
catalog06.pdf
Question: What is bearing number?: Answer: Bearing numbers are alphanumeric combinations that indicate the bearing type, boundary dimensions, internal clearance, dimensional and running accuracies, and other related specifications.
If you need further information, please refer to below link.
catalog02.pdf

Check other FAQ (1 items) Hide

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Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	Inner Diameter d (Ø)	Outer Diameter D (Ø)	Width B 1 (mm)	Bearing Type	Outer Ring Type	Materials of Inner and Outer Ring	Basic Load Rating Dynamic Rating (N)	Rolling Element Material	Revolution Frequency (rpm)	Basic Load Rating Static Rating (N)	Sealing Structure	Lubricant
MYR 16.18	1 Piece(s)	Available	4 Day(s) or more	3	9	5	Double Shielded	Flat	Steel	570	Steel	56000	187	Double steel plate shield	NS Hairyu-bu Grease
MYR 12.25	1 Piece(s)	Available	4 Day(s) or more	4	12	4	Double Shielded	Flat	Stainless Steel	816	Stainless Steel	48000	276	Double steel plate shield	NS Hairyu-bu Grease
MYR 6.90	1 Piece(s)	Available	37 Day(s) or more	4	12	4	Open Type	Flat	Steel	960	Steel	56000	345	Open Type	Aero, Shell Fluid 12 (oil)
MYR 10.56	1 Piece(s)	Available	4 Day(s) or more	4	16	5	Double Shielded	Flat	Steel	1730	Steel	36000	670	Double steel plate shield	NS Hairyu-bu Grease
MYR 22.92	1 Piece(s)	Available	4 Day(s) or more	1	3	1	Open Type	Flat	Stainless Steel	68	Stainless Steel	130000	18	Open Type	Aero, Shell Fluid 12 (oil)
MYR 18.42	1 Piece(s)	Available	4 Day(s) or more	1.5	4	1.2	Open Type	Flat	Steel	112	Steel	100000	33	Open Type	Aero, Shell Fluid 12 (oil)

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Small-Diameter Bearing (Open Type, Double Shielded, Rubber Seal Type) (634U)

(i)Caution

Drawing

Specifications Table

High-quality small-diameter bearings

Usage Example

Preload

Effect of preload

Preload method

Fixed position preload

Preload magnitude and direction

Basic Information

Configure

Specification/Dimensions

type

Inner Diameter d(Ø)

Outer Diameter D(Ø)

Width B 1(mm)

Bearing Type

Outer Ring Type

Materials of Inner and Outer Ring

Basic Load Rating Dynamic Rating(N)

Rolling Element Material

Sealing Structure

Lubricant

CAD

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Specify Alterations

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