Pillow block bearing unit is a bearing unit that combines a rolling bearing with a bearing housing. Most pillow block bearings are made of spherical outer diameter and are installed with pillow block which have spherical inner holes. They have various structural forms, good versatility and interchangeability.
Pillow blocks can refer to a variety of bearing styles such as single row ball bearings, double row ball bearings, spherical roller bearings, taper roller bearings, etc. A unit is typically a reference for a 1-piece housing as opposed to a split housing. For simplicity, this article will focus on single row ball bearing units.
“A basic pillow block bearing unit is typically an insert bearing which is based on a sealed deep groove ball bearing and a one piece housing.” Joshua Goldman, Applications Engineer for SKF USA says. These units consist of:
*an insert bearing which is based on a sealed single row deep groove ball bearing in the 62 series with a spherical (convex) outside diameter surface and an extended inner ring:
*a one-piece housing made of several different material options which include but are not limited to cast iron, cast stainless steel, and composite. The housing has a correspondingly sphered but concave bore.
Pillow block bearing size chart
Unit No.
Shaft Dia
Dimensions (mm)
Bolt Size
Weight
d
H
L
J
A
N
N1
H1
Ho
B
S
A3
(kg)
(in)
(mm)
UCP201
12
30.2
125
95
32
13
18
13
57
27.4
11.5
-
M10
0.72
UCP202
15
30.2
125
95
32
13
18
13
57
27.4
11.5
-
M10
0.66
UCP203
17
30.2
125
95
32
13
18
13
57
27.4
11.5
-
M10
0.66
UCP201
12
30.2
127
95
38
13
19
14
61
31
12.7
-
M10
0.76
UCP201-8
1/2
30.2
127
95
38
13
19
14
61
31
12.7
-
M10
0.76
UCP202
15
30.2
127
95
38
13
19
14
61
31
12.7
-
M10
0.74
UCP202-9
9/16
30.2
127
95
38
13
19
14
61
31
12.7
-
M10
0.74
UCP202-10
5/8
30.2
127
95
38
13
19
14
61
31
12.7
-
M10
0.74
UCP203
17
30.2
127
95
38
13
19
14
61
31
12.7
-
M10
0.72
UCP203-11
11/16
30.2
127
95
38
13
19
14
61
31
12.7
-
M10
0.72
UCP204
20
33.3
127
95
38
13
19
14
64
31
12.7
46.4
M10
0.70
UCP204-12
3/4
33.3
127
95
38
13
19
14
64
31
12.7
46.4
M10
0.70
UCP205
25
36.5
140
105
38
13
19
15
71
34.1
14.3
48
M10
0.76
UCP205-14
7/8
36.5
140
105
38
13
19
15
71
34.1
14.3
48
M10
0.76
UCP205-15
15/16
36.5
140
105
38
13
19
15
71
34.1
14.3
48
M10
0.76
UCP205-16
1
36.5
140
105
38
13
19
15
71
34.1
14.3
48
M10
0.76
UCP206
30
42.9
160
121
44
17
21
16
82
38.1
15.9
52
M14
1.25
UCP206-17
1-1/16
42.9
160
121
44
17
21
16
82
38.1
15.9
52
M14
1.25
UCP206-18
1-1/8
42.9
160
121
44
17
21
16
82
38.1
15.9
52
M14
1.25
UCP206-19
1-3/16
42.9
160
121
44
17
21
16
82
38.1
15.9
52
M14
1.25
UCP206-20
1-1/4
42.9
160
121
44
17
21
16
82
38.1
15.9
52
M14
1.25
UCP207
35
47.6
167
126
48
17
21
17
92
42.9
17.5
59
M14
1.55
UCP207-20
1-1/4
47.6
167
126
48
17
21
17
92
42.9
17.5
59
M14
1.55
UCP207-21
1-5/16
47.6
167
126
48
17
21
17
92
42.9
17.5
59
M14
1.55
UCP207-22
1-3/8
47.6
167
126
48
17
21
17
92
42.9
17.5
59
M14
1.55
UCP207-23
1-7/16
47.6
167
126
48
17
21
17
92
42.9
17.5
59
M14
1.55
UCP208
40
49.2
180
137
52
17
21
18
99
49.2
19
68.2
M14
1.90
UCP208-24
1-1/2
49.2
180
137
52
17
21
18
99
49.2
19
68.2
M14
1.90
UCP208-25
1-9/16
49.2
180
137
52
17
21
18
99
49.2
19
68.2
M14
1.90
UCP209
45
54
190
146
54
17
21
20
106
49.2
19
70
M14
2.20
UCP209-26
1-5/8
54
190
146
54
17
21
20
106
49.2
19
70
M14
2.20
UCP209-27
1-11/16
54
190
146
54
17
21
20
106
49.2
19
70
M14
2.20
UCP209-28
1-3/4
54
190
146
54
17
21
20
106
49.2
19
70
M14
2.20
UCP210
50
57.2
206
159
60
20
25
21
114
51.6
19
76
M16
2.75
UCP210-30
1-7/8
57.2
206
159
60
20
25
21
114
51.6
19
76
M16
2.75
UCP210-31
1-15/16
57.2
206
159
60
20
25
21
114
51.6
19
76
M16
2.75
UCP210-32
2
57.2
206
159
60
20
25
21
114
51.6
19
76
M16
2.75
UCP211
55
63.5
217
172
60
20
25
23
125
55.6
22.2
76
M16
3.30
UCP211-32
2
63.5
217
172
60
20
25
23
125
55.6
22.2
76
M16
3.30
UCP211-34
2-1/8
63.5
217
172
60
20
25
23
125
55.6
22.2
76
M16
3.30
UCP211-35
2-3/16
63.5
217
172
60
20
25
23
125
55.6
22.2
76
M16
3.30
UCP212
60
69.9
238
186
70
20
25
24
137
65.1
25.4
89
M16
4.70
UCP212-36
2-1/4
69.9
238
186
70
20
25
24
137
65.1
25.4
89
M16
4.70
UCP212-38
2-3/8
69.9
238
186
70
20
25
24
137
65.1
25.4
89
M16
4.70
UCP212-39
2-7/16
69.9
238
186
70
20
25
24
137
65.1
25.4
89
M16
4.70
UCP213
65
76.2
262
203
70
25
30
26
149
65.1
25.4
89
M20
5.60
UCP213-40
2-1/2
76.2
262
203
70
25
30
26
149
65.1
25.4
89
M20
5.60
UCP214
70
79.4
266
210
72
25
30
27
155
74.6
30.2
98
M20
6.60
UCP214-44
2-3/4
79.4
266
210
72
25
30
27
155
74.6
30.2
98
M20
6.60
UCP215
75
82.6
274
217
74
25
30
28
162
77.8
33.3
97
M20
7.30
UCP215-47
2-15/16
82.6
274
217
74
25
30
28
162
77.8
33.3
97
M20
7.30
UCP215-48
3
82.6
274
217
74
25
30
28
162
77.8
33.3
97
M20
7.30
UCP216
80
88.9
292
232
78
25
30
30
174
82.6
33.3
110
M20
9.00
UCP217
85
95.2
310
247
83
25
28
32
186
85.7
34.1
114.2
M20
10.80
UCP217-52
3-1/4
95.2
310
247
83
25
28
32
186
85.7
34.1
114.2
M20
10.80
UCP218
90
101.6
326
262
88
27
30
33
198
96
39.7
124
M22
13.00
UCP218-56
3-1/2
101.6
326
262
88
27
30
33
198
96
39.7
124
M22
13.00
UCP220
100
115
380
305
95
30
36
40
225
108
42
-
M24
16.00
(mm)
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