Bearing Inserts

Imperial or metric shaft sizes
Grub screw locking, single or double row eccentric locking or taper sleeve designs
Tri-lip seal designs available for wet and dirty environments
Stainless steel inserts to match our Thermoplastic and Stainless steel housings

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Product Overview

Single row ball bearings with a convex spherical outer diameter generally used with pressed steel or cast iron housings commonly referred to by their registered trade names of SKF "Y-bearings" or RHP "Self Lubes".

These bearings can be manufactured in various different guises, from standard inner ring to extended one side or even both sides.

We stock a comprehensive range of bearing inserts, including tapered bearing inserts, high-temperature bearing inserts, and stainless steel bearing inserts. The correct solution will depend on how the bearing is mounted and secured onto the shaft.

The extended shaft can be fitted to the shaft with grub screws or, alternatively, an eccentric locking collar. Some may even be tapered to accommodate an adapter sleeve so as to bring your bore down to a preferred size.

Where to Use Them?

These bearings are very popular for both light and heavy industrial applications and have a wide use in the automotive industry. The extended inner rings provide better shaft support as they can be mounted on shafts without the use of shoulders, lock nuts or bearing adapter sleeves. The wider rings of these bearings offer superior load distribution and have an added advantage of being able to be fitted onto the shaft without the use of special tools – saving time and money on installation.

What are the Typical Uses for Bearing Inserts?

Mounted bearing units
Agricultural equipment
Conveyor systems
Food processing machinery
Material handling equipment
Easy-to-install housing applications

Dimensions

UC 200 Series inserts

The basic dimensions and load ratings of the UC 200 Series are tabulated below.

Standard insert features a “dual seal “
Triple lip seal is denoted by the addition of suffix “-R3”

Bearing insert		d		D	B	C	S	S₁	Locking screw	Dynamic Cr(N)	Static Cor (N)
												in	mm	mm	mm	mm	mm	mm
		UC	201S		12	40	27.4	14				11.5	15.9	M5x0.8	9550	4780
	202S		15
	202-10S	5/8
	203S		17
	203-11S	11/16
UC	201		12	47	31	16	12.7	18.3	M6x1 or 1/4″-28	12800	6650
	202		15
	202-10	1/2
	203		17
	203-11	11/16
	204-12	3/4
	204		20
UC	205-14	7/8		52	34	17	14.3	19.7	M6x1 or 1/4″-28	14000	7880
	205-15	15/16
	205		25
	205-16	1
UC	206-18	1.1/8		62	38.1	19	15.9	22.2	M6x1 or 1/4″-28	19500	11200
	206		30
	206-19	1.3/16
	206-20	1.1/4
UC	207-20	1.1/4		72	42.9	20	17.5	25.4	M8x1 or 5/16″-24	25700	15200
	207-22	1.3/8
	207		35
	207-23	1.7/16
UC	208-24	1.1/2		80	49.2	21	19	30.2	M8x1 or 5/16″-24	29600	18200
	208		40
UC	209-26			85	49.2	21	19	30.2	M8x1 or 5/16″-24	31850	20800
	209-28
	209		45
UC	210-30	1.7/8		90	51.6	23	19	32.6	M10x1.25 or 3/8″-24	35100	23200
	210		50
	210-32	2
UC	211-32	2		100	55.6	25	22.2	33.4	M10x1.25 or 3/8″-24	43550	29200
	211		55
	211-35	2.3/16
UC	212-36	2.1/4		110	65.1	27	25.4	39.7	M10x1.25 or 3/8″-24	47800	32800
	212		60
	212-38	2.3/8
	212-39	2.7/16
UC	213-40	2.1/2		120	65.1	28	25.4	39.7	M12x1.25 or 7/16″-20	57200	40000
	213		65
UC	214-44	2.3/4		125	74.6	30	30.2	44.4	M12x1.25 or 7/16″-20	60800	45000
	214		70
UC	215-47	2.15/16		130	77.8	30	33.3	44.5	M12x1.25 or 7/16″-20	66000	49500
	215		75
	215-48	3
UC	216		80	140	82.6	33	33.3	49.3	M12x1.25 or 7/16″-20	71500	54200
UC	217-52	3.1/4		150	85.7	35	34.1	51.6	M12x1.25 or 7/16″-20	83200	63800
	217		85
UC	218-56	3./12		160	96	37	39.7	56.3	M12x1.25 or 7/16″-20	95900	71500
	218		90
UC	220		100	180	108	40	42	66	M16x1.5	122000	92800
	220-64	4

UCX Series

Bearing insert		d		D	B	C	S	S₁	Locking screw	Dynamic Cr(N)	Static Cor (N)
												in	mm	mm	mm	mm	mm	mm
		UCX	05-14	7/8		62	38.1	19				15.9	22.2	M6x1	19500	11200
	05-15	15/16
	05		25
	05-16	1
UCX	06-18	1.1/8		72	42.9	20	17.5	25.4	M8x1	25700	15200
	06		30
	06-19	1.3/16
	06-20	1.1/4
UCX	07-22	1.3/8		80	49.2	21	19	30.2	M8x1	29600	18200
	07		35
	07-23	1.7/16
UCX	08-24	1.1/2		85	49.2	22	19	30.2	M8x1	31850	20800
	08-25	1.9/16
	08		40
UCX	09-26	1.5/8		90	51.6	23	19	32.6	M10x1.25	35100	23200
	09-27	1.11/16
	09-28	1.3/4
	09		45
UCX	10-30	1.7/8		100	55.6	25	22.2	33.4	M10x10.25	43550	29200
	10-31	1.15/16
	10		50
	10-32	2
UCX	11-34	2.1/8		110	65.1	27	25.4	39.7	M10x1.25	47800	32800
	11		55
	11-35	2.3/16
	11-36	2.1/4
UCX	12		60	120	65.1	28	25.4	39.7	M12x1.25	57200	40000
	12-38	2.3/8
	12-39	2.7/16
UCX	13-40	2.1/2		125	74.6	30	30.2	44.4	M12x1.25	60800	45000
	13		65
UCX	14-44	2.3/4		130	77.8	30	33.3	44..5	M12x1.25	66000	49500
	14		70
UCX	15		75	140	82.6	33	33.3	49.3	M12x1.25	71500	54200
	15-48	3
UCX	16		80	150	85.7	35	34.1	51.6	M12x1.25	83200	63800
UCX	17-52	3.1/4		160	96	37	39.7	56.3	M12x1.25	95900	71500
	17		85
UCX	18-56	3./12		170	104	39	42.9	61.1	M14x1.5	109000	82800
	18		90
UCX	20		100	190	117.5	44	49.2	68.3	M14x1.5	133000	105000
	20-64	4

UC 300 Series Inserts

UC		d		D	B	C	S	S₁	Locking screw	Dynamic Cr(N)	StaticCor (N)
												in	mm	mm	mm	mm	mm	mm
		UC	305-14	7/8		62	38.1	21				15	23	M6x1	22360	11500
	305-15	15/16
	305		25
	305-16	1
UC	306-18	1.1/8		72	43	24	17	26	M6x1	27000	15200
	306		30
	306-19	1.3/16
UC	307-20	1.1/4		80	48	21	19	30.2	M8x1	29600	18200
	307-21	1.5/16
	307-22	1.3/8
	307		35
UC	308-24	1.1/2		90	52	28	19	33	M10x1.25	40560	24000
	308-25	1.9/16
	308		40
UC	309-26	1.5/8		100	57	30	22	35	M10x1.25	53000	31800
	309-27	1.11/16
	309-28	1.3/4
	309		45
UC	310-30	1.7/8		110	61	32	22	39	M12x1.25	61750	37800
	310-31	1.15/16
	310	2
UC	311-32	2		120	66	34	25	41	M12x1.25	71500	44800
	311-34	2.1/8
	311		55
	311-35	2.3/16
UC	312-36	2.1/4		130	71	36	26	45	M12x1.25	81600	51800
	312		60
	312-38	2.3/8
	312-39	2.7/16
UC	313-40	2.1/2		140	75	38	30	45	M12x1.25	93860	60500
	313		65
UC	314-44	2.3/4		150	78	40	31	47	M12x1.25	104260	68000
	314		70
UC	315		75	160	82	42	32	50	M14x1.5	113360	76800
	315-48	3
UC	316		80	170	86	44	34	52	M14x1.5	122850	86500
UC	317-52	3.1/4		180	96	46	40	56	M16x1.5	132600	95600
	317		85
UC	318-56	3./12		190	96	48	40	56	M16x1.5	143000	108000
	318		90
UC	319		95	200	103	50	41	62	M16x1.5	156000	122000
	319-60	3.3/4
UC	320		100	215	108	54	42	66	M18x1.5	171600	140000
	320-64	4
UC	322		110	240	117	60	46	71	M18x1.5	158000	178000
UC	324		120	260	126	64	51	75	M18x1.5	175000	208000
UC	326		130	280	135	68	54	81	M20x1.5	195000	242000
UC	328		140	300	145	72	59	86	M20x1.5	212000	272000

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Technical

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Features of bearing inserts

Ball bearing with spherical outside diameter
A wide range or inch or metric bores locked onto the shaft by means of setscrews, eccentric locking collars or taper bush adapters
Contact seals, flinger seals or triple lip seal configurations
Considered sealed for life in many applications

Allowable running speeds

The allowable speed for bearing inserts is defined by the quality of support offered by the shaft.

shaft d (mm)	200 Series				300 Series
	Shaft tolerance				Shaft tolerance
	j7 (h9/IT5)	h7	h8	h9	j7 (h9/IT5)	h7	h8	h9
12	6700	5300	3800	1400	–	–	–	–
15	6700	5300	3800	1400	–	–	–	–
17	6700	5300	3800	1400	–	–	–	–
20	6000	4800	3400	1200	–	–	–	–
25	5600	4000	3000	1000	5000	3600	2600	900
30	4500	3400	2400	850	4300	3000	2200	800
35	4000	3000	2000	750	3800	2800	2000	700
40	3600	2600	1900	670	3400	2400	1700	630
45	3200	2400	1700	600	3000	2200	1500	560
50	3000	2200	1600	560	2600	2000	1400	500
55	2600	2000	1400	500	2400	1800	1300	450
60	2400	1800	1200	450	2200	1700	1100	430
65	2200	1700	1100	430	2000	1500	1100	400
70	2200	1600	1100	400	1900	1400	1000	360
75	2000	1500	1000	380	1800	1300	900	340
80	1900	1400	950	340	1700	1200	850	320
85	1800	1300	900	320	1600	1100	800	300
90	1700	1200	800	300	1500	1100	750	280
95	–	–	–	–	1400	1000	700	260
100	–	–	–	–	1300	950	670	240
105	–	–	–	–	1200	900	630	220
110	–	–	–	–	1200	800	600	200
120	–	–	–	–	1100	750	530	190
130	–	–	–	–	1000	670	480	180
140	–	–	–	–	900	600	430	160

Shaft tolerances

Setscrew inserts are generally mounted with a loose fit for easy installation. For most normal industrial applications the shaft tolerances below should suffice.

Shaft d		Allowable deviation in shaft diameter (µm)
Shaft d		low speed	low-medium speed	medium-high speed	highest speed
mm		h9	h8	h7	j6	h6
over	incl.	max/min	max/min	max/min	max/min	max/min
10	18	0 / -43	0 / -27	0 / -18	+8 / -3	0 / -11
18	30	0 / -52	0 / -33	0 / -21	+9 / -4	0 / -13
30	50	0 / -62	0 / -39	0 / -25	+11 / -5	0 / -16
50	80	0 / -74	0 / -46	0 / -30	+12 / -7	0 / -19
80	120	0 / -87	0 / -54	0 / -35	+13 / -9	0 / -22

At high speeds or under heavy load, setscrew inserts should be fitted with a tight fit with shaft tolerances indicated below

Shaft d		Allowable deviation in shaft diameter (µm)
Shaft d		medium-high speed	medium-heavy load	high speed	heavy load
mm		m6	m7	n6	n7
over	incl.	max/min	max/min	max/min	max/min
10	18	+18 / +7	+25 / +7	+23 / +12	+30 / +12
18	30	+21 / +8	+29 / +8	+28 / +15	+36 / +15
30	50	+25 / +9	+34 / +9	+33 / +17	+42 / +42
50	80	+30 / +11	+41 / +11	+39 / +20	+50 / +20
80	120	+35 / +13	+48 / +13	+45 / +23	+58 / +23

For bearings with an adapter sleeve an h9 or even h10 shaft tolerance can be used.

Bore tolerance

The insert bore tolerance of inserts is tabulated below

d		Δ dmp		Kia	Δ Bs
mm		μm		μm	μm
over	incl.	high	low	max	high	low
10	18	+18	0	12	0	-120
18	30	+21	0	15	0	-120
30	50	+25	0	1	0	-120
50	80	+30	0	22	0	-150
80	120	+35	0	28	0	-200
120	180	+40	0	35	0	-250

d – Nominal bore diameter

Δdmp – The deviation of a single plane mean bore diameter of the inner rings

Kia – The radial runout of the assembled bearings inner ring

ΔBs – The deviation of a single width of inner ring

Setscrew tightening torque

The recommended setscrew torques are listed below

Setscrew size		Tightening torque
mm	inch	Nm	ibf.in
M5x0.8	No10-32 UNF	3.16	28
M6x1	1/4-28 UNF	34 – 4	30 – 35.4
M8x1	5/16-24 UNF	7.8 – 8.3	69 – 73.5
M10x1.25	3/8-24 UNF	16.3 – 17.2	144 – 152
M12x1.25	7/16-20 UNF	26.5 – 27.4	235 – 243
M14x1.5	1/2-20 UNF	33.4 – 34.3	296 – 304
M16x1.5	5/8-18 UNF	54 – 54.9	478 – 486

Overtightening is a common cause of “failure”

Adapter sleeve inserts

After installing the insert, adapter sleeve with locking washer and nut on the shaft , it is usually sufficient to tighten the insert by hand, and then an extra 2/5 – 3/5 of a revolution.

If the insert does not clamp down on the shaft, ensure the adapter size matches the nominal shaft diameter.

Eccentric locking collar inserts

When locked to the shaft in the direction of rotation, the collar will automatically tighten further by the action of the working radial loads. The setscrews are then tightened.

In applications with reversing shafts, a double eccentric locking collar will be required.

High axial load applications

The axial load carrying capacity of the insert will be limited by the quality of fit between insert and shaft.

If a high axial load is to be supported a shoulder should be machine into the shaft against which the insert is fitted. Drilling into the shaft to improve setscrew performance may add unwanted stress multipliers.

In such applications, check the housing is capable of carrying the load in the direction required. The housing tear out strength is not necessarily equal to the carrying capacity of the bearing insert.

Lubrication

Standard bearing inserts are factory filled with a lithium EP2 grease and have an operating temperature range of -20 to +120 °C. In many applications they can be considered “sealed for life”.

However, in some applications relubrication is advisable. A guide is tabulated below

dn value	Environment	Temp C	Relube interval
< 40 000	Clean	-15 to +65	6 – 12 months
< 40 000	Clean	+65 to +100	2 – 6 months
<70 000	Clean	-15 to +65	2 – 6 months
<70 000	Clean	+65 to +100	1 month
Any	Dirty	< 65	1 week – 1 month
	Dirty	> 65	1 day – 2 weeks
	Very dirty	Any	1 day – 1 week
	Water splash	Any	Daily/ Constant

Any good quality lithium or lithium/calcium EP2 grease can be used, and better performance will be achieved with a more modern grease such as a Calcium-sulphonate grease in extremely wet applications.

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Downloads

UC 200 Bearing Inserts

UC 200T Bearing Inserts with locking collar

UCX Bearing Inserts

UC 300 Heavy Duty Bearing Inserts

UC 300 T Heavy Duty Bearing Insert with locking collar

UK 200 Bearing Inserts, taper bore for adapter sleeve

UK 300 Heavy Duty Bearing Insert, taper bore for adapter sleeve

Adapter Sleeves

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Enquire Now About Bearing Inserts

For any enquiries regarding Bearing Inserts, please complete our enquiry form, and a member of our technical team will respond promptly. Alternatively, you can reach out directly to one of our offices using the contact details here. Our specialists are ready to provide guidance and support tailored to your machinery and engineering needs.