Overview

Pillow block and mounted units from Western Bearing House

Mounted units combine a bearing with its housing, so they install quickly and keep the bearing protected. Our catalog lists Hoffmann-pattern self-aligning units in parallel bore (LSW / RLSW) and clamping sleeve and nut (LTW, MSW and MTW) types, in inch shaft sizes, for line shafts, conveyors and field machinery.

Series: 4
Catalogued sizes: 94
Bore range: 19–165.1 mm
O.D. up to: 324 mm

Typical applications

Conveyor systemsMining equipmentAgricultural machineryLine shafts and countershafts

Engineering features

Bolt-on housing for quick installation
Self-aligning to absorb mounting error
Parallel bore or clamping sleeve and nut
Robust sealing for dusty conditions
Hardness, dimensional and vibration tested
AISI 52100 / 100Cr6 steel, 60–64 HRC

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Technical specifications

Construction, standards and dimension range for pillow block and mounted units. Dimensions are converted to millimetres for inch series.

**Pillow block and mounted units**Technical specification
Bearing type	Pillow block and mounted units
Designs and series	Hoffmann-pattern units: LSW / RLSW parallel bore; LTW, MSW and MTW with clamping sleeve and nut
Catalogued sizes	94 sizes in 4 series
Bore range (d)	19–165.1 mm
Outside diameter (D)	63.5–323.8 mm
Width range (B)	15.9–88.9 mm
Measurement system	Inch sizes
Material	High-carbon chromium bearing steel, AISI 52100 / 100Cr6
Hardness	Through-hardened, 60–64 HRC
Precision class	ISO 492 / DIN 620 Normal (P0), P6 and P5
Radial clearance	C2, Normal, C3 and C4
Cage	Pressed steel
Bore type	Parallel bore, or clamping sleeve and nut
Quality testing	Hardness, dimensional, runout and vibration testing of every bearing
Packing	Anti-corrosive VCI export wrapping
Typical applications	Conveyor systems, Mining equipment, Agricultural machinery, Line shafts and countershafts

Series overview

Every catalog series in this family. Select a series to open its full size and interchange table below.

**Series**Pillow block and mounted units: 4 series
Description	System	Sizes	Bore (d)	O.D. (D)	Width (B)	Catalog page
Hoffmann self-aligning units Parallel bore type LSW / RLSW	Inch	24	1–6.5 in	2.5–11.8 in	0.6–1.6 in	92
Hoffmann self-aligning units Clamping sleeve and nut type LTW / RLTW	Inch	24	0.7–6 in	2.5–11.8 in	1.1–2.9 in	93
Hoffmann self-aligning units Clamping sleeve and nut type MSW / RMSW	Inch	23	1–6 in	2.8–12.8 in	1.2–3.5 in	94
Hoffmann self-aligning units Clamping sleeve and nut type MTW / RMTW	Inch	23	0.7–5.5 in	2.8–12.8 in	1.2–3.5 in	95

Size and interchange tables

Bearing numbers with their equivalents and dimensions from our catalog. Select any row for its technical drawing and full cross-reference.

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**Series Hoffmann LSW**Hoffmann self-aligning units, parallel bore type LSW / RLSW. Dimensions in inches.
Bearing number and equivalents	Dimensions (in)
Bearing no.	Bore d	O.D. D	E	F	Width B	H
LSW/RLSW 10	1	2 1/2	1 1/4	1 1/4	5/8	1 1/16
RLSW 11	1 1/8	2 3/4	1 3/8	1 1/4	5/8	1 1/16
RLSW 12	1 1/4	3	1 1/2	1 7/16	11/16	1 3/16
RLSW 12.1/2	1 1/8	3 5/16	1 5/8	1 7/16	11/16	1 3/16
LSW/RLSW 13	1 1/2	3 5/8	1 7/8	1 9/16	3/4	1 5/16
RLSW 13.1/2	1 5/8	3 7/8	2	1 9/16	3/4	1 5/16
RLSW 14	1 3/4	4 1/8	2 1/8	1 5/8	13/16	1 3/8
RLSW 14.1/2	1 7/8	4 3/8	2 1/4	1 5/8	13/16	1 3/8
LSW/RLSW 15	2	4 3/8	2 3/8	1 11/16	13/16	1 3/8
RLSW 16	2 1/4	4 7/8	2 5/8	1 7/8	7/8	1 7/16
RLSW 17	2 1/2	5 3/8	2 7/8	1 15/16	15/16	1 1/2
RLSW 18	2 3/4	5 5/8	3 1/8	1 15/16	15/16	1 5/8
LSW/RLSW 19	3	6 1/8	3 1/2	2 1/4	1 1/16	1 7/8
RLSW 19.1/2	3 1/4	6 3/8	3 3/4	2 1/4	1 1/16	1 7/8
RLSW 20	3 1/2	7	4	2 3/8	1 1/8	2
RLSW 20.1/2	3 3/4	7 1/4	4 1/4	2 3/8	1 1/8	2
LSW/RLSW 21	4	7 3/4	4 1/2	2 1/2	1 1/4	2 1/8
RLSW 21.1/2	4 1/4	8	4 3/4	2 1/2	1 1/4	2 1/8
RLSW 22	4 1/2	8 1/2	5	2 15/16	1 5/16	2 3/8
RLSW 22.1/2	4 3/4	8 3/4	5 1/4	2 15/16	1 5/16	2 3/8
LSW/RLSW 23	5	9 5/8	5 1/2	3 1/8	1 3/8	2 1/2
RLSW 23.1/2	5 1/2	10 1/8	6	3 1/8	1 3/8	2 1/2
RLSW 24	6	11 1/8	6 5/8	3 7/16	1 9/16	2 7/8
RLSW 24.1/2	6 1/2	11 3/4	7 1/8	3 7/16	1 9/16	2 7/8

**Series Hoffmann LTW**Hoffmann self-aligning units, clamping sleeve and nut type LTW / RLTW. Dimensions in inches.
Bearing number and equivalents	Dimensions (in)
Bearing no.	Bore d	O.D. D	L	Width B	H
LTW/RLTW 10	3/4	2 1/2	2 3/16	1 1/16	1
RLTW 11	7/8	2 3/4	2 3/16	1 1/16	1 1/8
RLTW 12	1	3	2 1/4	1 3/16	1 1/4
RLTW 12.1/2	1 1/8	3 5/16	2 1/4	1 3/16	1 3/8
LTW/RLTW 13	1 1/4	3 5/8	2 3/8	1 5/16	1 1/2
RLTW 13.1/2	1 3/8	3 7/8	2 3/8	1 5/16	1 5/8
RLTW 14	1 1/2	4 1/8	3 5/8	1 3/8	1 3/4
RLTW 14.1/2	1 5/8	4 3/8	2 11/16	1 3/8	1 7/8
LTW/RLTW 15	1 3/4	4 3/8	2 11/16	1 3/8	2
RLTW 16	2	4 7/8	2 7/8	1 7/16	2 1/4
RLTW 17	2 1/4	5 3/8	3 1/16	1 1/2	2 1/2
RLTW 18	2 1/2	5 5/8	3 1/16	1 5/8	2 3/4
LTW/RLTW 19	2 5/8	6 1/8	3 3/8	1 7/8	3
RLTW 19.1/2	2 3/4	6 3/8	3 1/8	1 7/8	3 1/4
RLTW 20	3	7	3 5/4	2	3 1/2
RLTW 20.1/2	3 1/4	7 1/4	3 5/8	2	3 3/4
LTW/RLTW 21	3 1/2	7 3/4	4	2 1/8	4
RLTW 21.1/2	3 3/4	8	4	2 1/8	4 1/4
RLTW 22	4	8 1/2	4 1/2	2 3/8	4 1/2
RLTW 22.1/2	4 1/4	8 3/4	4 1/2	2 3/8	4 3/4
LTW/RLTW 23	4 1/2	9 5/8	4 3/4	2 1/2	5
RLTW 23.1/2	5	10 1/8	4 3/4	2 1/2	5 1/2
RLTW 24	5 1/2	11 1/8	5 3/16	2 7/8	6
RLTW 24.1/2	6	11 3/4	5 3/16	2 7/8	6 1/2

**Series Hoffmann MSW**Hoffmann self-aligning units, clamping sleeve and nut type MSW / RMSW. Dimensions in inches.
Bearing number and equivalents	Dimensions (in)
Bearing no.	Bore d	O.D. D	E	F	H	Width B
MSW/RMSW 10	1	2 3/4	1 3/8	1 3/8	3/8	1 3/16
RMSW 11	1 1/8	3 1/8	1 1/2	1 7/16	13/16	1 1/4
RMSW 12	1 1/4	3 1/2	1 5/8	1 5/8	7/8	1 3/8
RMSW 12.1/2	1 3/8	3 7/8	1 3/4	1 5/8	7/8	1 3/8
MSW/RMSW 13	1 1/2	4 1/8	1 7/8	1 3/4	15/16	1 1/2
RMSW 13.1/2	1 5/8	4 3/8	2	1 3/4	15/16	1 1/2
RMSW 14	1 3/4	4 5/8	2 1/8	1 7/8	1 1/16	1 5/8
RMSW 14.1/2	1 7/8	4 7/8	2 1/8	1 15/16	1 1/16	1 5/8
MSW/RMSW 15	2	4 7/8	2 3/8	1 15/16	1 1/16	1 5/8
RMSW 16	2 1/4	5 3/8	2 3/4	2 1/4	1 1/4	1 13/16
RMSW 17	2 1/2	5 7/8	3	2 1/4	1 1/4	1 13/16
RMSW 18	2 3/4	6 5/8	6 5/8	2 3/8	1 3/8	2 1/16
MSW/RMSW 19	3	7 1/2	3 5/8	2 3/4	1 9/16	2 3/8
RMSW 19.1/2	3 1/4	8	3 7/8	2 3/4	1 9/16	2 3/8
RMSW 20	3 1/2	8 5/8	4 1/8	3	1 3/4	2 5/8
RMSW 20.1/2	3 3/4	8 3/4	4 3/8	3	1 3/3	2 5/8
MSW/RMSW 21	4	9 1/8	4 5/8	3	1 3/4	2 5/8
RMSW 21.1/2	4 1/4	9 3/8	4 7/8	3	1 3/4	2 5/8
RMSW 22	4 1/2	10	5 1/4	3 1/2	2	3
RMSW 22.1/2	4 3/4	10 5/8	5 1/2	3 1/2	2	3
MSW/RMSW 23	5	10 5/8	5 3/4	3 1/2	2	3
RMSW 23.1/2	5 1/2	11 3/4	6 1/4	3 3/4	2	3 1/8
RMSW 24	6	12 3/4	6 3/4	4	2 1/4	3 1/2

**Series Hoffmann MTW**Hoffmann self-aligning units, clamping sleeve and nut type MTW / RMTW. Dimensions in inches.
Bearing number and equivalents	Dimensions (in)
Bearing no.	Bore d	O.D. D	L	Width B	H
MTW/RMTW 10	3/4	2 3/4	2 5/16	1 3/16	1
RMTW 11	7/8	3 1/8	2 3/8	1 1/4	1 1/8
RMTW 12	1	3 1/2	2 7/16	1 3/8	1 1/4
RMTW 12.1/2	1 1/8	3 7/8	2 7/16	1 3/8	1 3/8
MTW/RMTW 13	1 1/4	4 1/8	2 9/16	1 1/2	1 1/2
RMTW 13.1/2	1 3/8	4 3/8	2 9/16	1 1/2	1 5/8
RMTW 14	1 1/2	4 5/8	2 7/8	1 5/8	1 3/4
RMTW 14.1/2	1 5/8	4 7/8	2 15/16	1 5/8	1 7/8
MTW/RMTW 15	1 3/4	4 7/8	2 15/16	1 5/8	2
RMTW 16	2	5 3/8	3 1/4	1 13/16	2 1/4
RMTW 17	2 1/4	5 7/8	3 3/8	1 13/16	2 2/16
RMTW 18	2 1/2	6 5/8	3 5/8	2 1/16	2 2/16
MTW/RMTW 19	2 5/8	7 1/2	4	2 3/8	3 1/16
RMTW 19.1/2	2 3/4	8	4	2 3/8	3 5/16
RMTW 20	3	8 5/8	4 1/4	2 5/8	3 5/8
RMTW 20.1/2	3 1/4	8 3/4	4 1/4	2 5/8	3 13/16
MTW/RMTW 21	3 1/2	9 1/2	4 1/2	2 5/8	4 1/8
RMTW 21.1/2	3 3/8	9 3/8	4 1/2	2 5/8	4 3/8
RMTW 22	4	10	5	3	4 5/8
RMTW 22.1/2	4 1/2	10 5/8	5	3	4 1/8
MTW/RMTW 23	4 1/2	10 5/8	5	3	5 1/8
RMTW 23.1/2	5	11 3/4	5 1/4	3 1/8	5 5/8
RMTW 24	5 1/2	12 3/4	5 3/4	3 1/2	6

Source: Western Bearing House product guide, page 93. Inch sizes are written as a whole number and fraction, for example 1 1/2.

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