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Pillow Block Bearings

pillow block bearing & insert bearing-1
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Bearing Overview

Pillow block bearings (also known as mounted bearings or plummer block units) are self-contained bearing units designed to support rotating shafts while reducing friction between the shaft and the housing. They typically consist of a spherical outer surface insert bearing mounted inside a housing block, which allows for easy installation and reliable shaft support.

Thanks to their self-aligning capability, pillow block bearings can compensate for initial misalignment during installation and small shaft deflections during operation. The housings are commonly made from cast iron, ductile iron, stainless steel, or engineering polymers, making them suitable for a wide range of industrial environments.

These bearings are widely used in conveyor systems, agricultural machinery, packaging equipment, textile machines, and general industrial automation, offering a balance of durability, ease of maintenance, and cost-effectiveness.

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Key Features

  • Self-aligning design to compensate for shaft misalignment
  • Easy installation and replacement
  • Available in multiple housing types and mounting styles
  • Suitable for moderate radial loads
  • Compact and integrated bearing unit design
  • Available in cast iron, stainless steel, and polymer housings
  • Grease lubricated for long service life and low maintenance
  • Wide range of shaft locking methods (set screw, eccentric collar, adapter sleeve)

Bearing Series

Pillow block bearing units are available in a wide range of series to meet different shaft sizes and installation requirements:

  • UC Series (Insert bearings)
  • UCP Series (Pillow block housing with base mounting)
  • UCF Series (Square flange type housing)
  • UCFL Series (Oval flange type housing)
  • UCT Series (Take-up unit for tension adjustment systems)
  • UCFC Series (Round flange type housing)
  • UCPA Series (Compact pillow block type)
  • UK Series (Tapered bore insert bearings)
  • UKP Series (Mounted units with adapter sleeve design)

… Many other bearing models and series are not listed here. If you have any specific requirements or questions, feel free to contact us.

Applications

Pillow block bearings are widely used in industrial and agricultural systems that require reliable shaft support and easy maintenance.

  • Conveyor systems
  • Agricultural machinery
  • Packaging machinery
  • Textile machinery
  • Food processing equipment
  • HVAC systems
  • Industrial fans and blowers
  • Material handling equipment
  • Printing machinery
  • Automation production lines

Technical Specifications

Item Available Options
Structure Insert Bearing + Housing Unit
Series UC / UCP / UCF / UCFL / UCFC / UCT / UCPA / UK / UKP
Bore Diameter Standard metric sizes
Housing Material Cast Iron / Ductile Iron / Stainless Steel / Polymer
Shaft Locking Type Set Screw / Eccentric Collar / Adapter Sleeve
Sealing Type Rubber Seal / Contact Seal
Lubrication Pre-greased / Re-lubricatable
Operating Temperature Standard industrial range

Dimensions Table

Please refer to the table below for detailed dimensions and specifications of each series and model.

Many additional bearing models and customized solutions are available. If you have specific requirements, please feel free to contact us for technical support and selection guidance.

Model NO. d D B (S) S1 C C1 C2 dS
max max min max
UC 201S 12 40 27.4 11.5 15.9 12 15 3.4 2 M5×0.8
UC 201S-8 12.7 10-32UNF
UC 201S-9 14.288 10-32UNF
UC 202S 15 M5×0.8
UC 202S-10 15.875 10-32UNF
UC 203S 17 M5×0.8
UC 203S-11 17.462 10-32UNF
UC 201 12 47 31 12.7 18.3 14 17 3.7 2 M6×1
UC 201-8 12.7 1/4-28UNF
UC 201-9 14.288 1/4-28UNF
UC 202 15 M6×1
UC 202-10 15.875 1/4-28UNF
UC 203 17 M6×1
UC 203-11 17.462 1/4-28UNF
UC 204-12 19.052 47 31 12.7 18.3 14 17 3.7 2 1/4-28UNF
UC 204 20 M6×1
UC 205-13 20.638 52 34.1 14.3 19.8 15 17 3.9 2.5 1/4-28UNF
UC 205-14 22.225 1/4-28UNF
UC 205-15 23.812 1/4-28UNF
UC 205 25 M6×1
UC 205-16 25.4 1/4-28UNF
UC 206-17 26.988 62 38.1 15.9 22.2 16 19 5 2.5 1/4-28UNF
UC 206-18 28.575 1/4-28UNF
UC 206 30 M6×1
UC 206-19 30.162 1/4-28UNF
UC 206-20 31.75 1/4-28UNF
UC 207-20 31.75 72 42.9 17.5 25.4 17 20 5.7 3 5/16-24UNF
UC 207-21 33.338 5/16-24UNF
UC 207-22 34.925 5/16-24UNF
UC 207 35 M8×1
UC 207-23 36.512 5/16-24UNF
UC 208-24 38.1 80 49.2 19 30.2 18 21 6.2 3 5/16-24UNF
UC 208-25 39.688 5/16-24UNF
UC 208 40 M8×1
UC 209-26 41.275 85 49.2 19 30.2 19 22 6.4 3 5/16-24UNF
UC 209-27 42.862 5/16-24UNF
UC 209-28 44.45 5/16-24UNF
UC 209 45 M8×1
UC 210-29 46.038 90 51.6 19 32.6 20 24 6.5 3.5 3/8-24UNF
UC 210-30 47.625 3/8-24UNF
UC 210-31 49.212 3/8-24UNF
UC 210 50 M10×1.25
UC 210-32 50.8 3/8-24UNF
UC 211-32 50.8 100 55.6 22.2 33.4 21 25 7 3.5 3/8-24UNF
UC 211-33 52.388 3/8-24UNF
UC 211-34 53.975 3/8-24UNF
UC 211 55 M10×1.25
UC 211-35 55.562 3/8-24UNF
UC 212-36 57.15 110 65.1 25.4 39.7 22 27 7.6 4 3/8-24UNF
UC 212-37 58.738 3/8-24UNF
UC 212 60 M10×1.25
UC 212-38 60.325 3/8-24UNF
UC 212-39 61.912 3/8-24UNF
UC 213-40 63.5 120 68.3 25.4 42.9 23 32 8.9 5 3/8-24UNF
UC 213 65 M10×1.25
UC 213-42 66.675 3/8-24UNF
UC 214-43 68.262 125 74.6 30.2 44.4 24 35 8.9 5 7/16-20UNF
UC 214-44 69.85 7/16-20UNF
UC 214 70 M12×1.5
UC 215-45 71.438 130 77.8 33.3 44.5 25 39 8.9 5 7/16-20UNF
UC 215-46 73.025 7/16-20UNF
UC 215-47 74.612 7/16-20UNF
UC 215 75 M12×1.5
UC 215-48 76.2 7/16-20UNF
UC 216-50 79.375 140 82.6 33.3 49.3 26 43 8.9 6 7/16-20UNF
UC 216 80 M12×1.5
UC 216-51 80.962 7/16-20UNF
UC 217-52 82.55 150 85.7 34.1 51.6 28 50 10 6 7/16-20UNF
UC 217 85 M12×1.5
UC 217-54 85.725 7/16-20UNF
UC 217-55 87.312 7/16-20UNF
UC 217-56 88.9 7/16-20UNF
UC 218-56 88.9 160 96 39.7 56.3 30 50 10 6 7/16-20UNF
UC 218 90 M12×1.5
UC 220 100 180 108 42 66 34 51 11.2 6 M12×1.5
UC 220-63 100.012 7/16-20UNF
UC 220-64 101.6 7/16-20UNF
Model NO. d D B (S) S1 C C1 C2 dS
max max min max
UC 305 25 62 38 15 23 17 24 5.6 3 M6x1
UC 306 30 72 43 17 26 19 26 6 3 M6x1
UC 306-19 30.162 1/4-28UNF
UC 307-20 31.75 80 48 19 29 21 28 6.7 3.5 5/16-24UNF
UC 307-21 33.338 5/16-24UNF
UC 307-22 34.925 5/16-24UNF
UC 307 35 M8X1
UC 307-23 36.512 5/16-24UNF
UC 308-24 38.1 90 52 19 33 23 30 7.5 4 3/8-24UNF
UC 308 40 M10X1.25
UC 309-26 41.275 100 57 22 35 25 33 8.3 4 3/8-24UNF
UC 309-27 42.862 3/8-24UNF
UC 309-28 44.45 3/8-24UNF
UC 309 45 M10x1.25
UC 310-30 47.625 110 61 22 39 27 35 9.5 4.5 7/16-20UNF
UC 310-31 49.212 7/16-20UNF
UC 310 50 M12x1.5
UC 311-32 50.8 120 66 25 41 29 37 10.3 5 7/16-20UNF
UC 311-33 52.388 7/16-20UNF
UC 311 55 M12x1.5
UC 312 60 130 71 26 45 31 39 11.1 5 M12x1.5
UC 312-39 61.912 7/16-20UNF
UC 313-40 63.5 140 75 30 45 33 41 11.9 5.5 7/16-20UNF
UC 313 65 M12x1.5
UC 314-43 68.262 150 78 33 45 35 43 12.7 6 7/16-20UNF
UC 314 70 M12x1.5
UC 315-47 74.612 160 82 32 50 37 46 13.5 6 1/2-20UNF
UC 315 75 M14X1.5
UC 315-48 76.2 1/2-20UNF
UC 316 80 170 86 34 52 39 48 14.3 6.5 M14x1.5
UC 316-51 80.962 1/2-20UNF
UC 317 85 180 96 40 56 41 50 15.1 7 M16x1.5
UC 318-55 87.312 190 96 40 56 43 52 15.9 7 5/8-18UNF
UC 318 90 M16x1.5
UC 319 95 200 103 41 62 45 54 16.7 7.5 M16X1.5
UC 320 100 215 108 42 66 47 58 18.3 8 M18x1.5
UC 320-63 100.012 5/8-18UNF
UC 320-64 101.6 5/8-18UNF
UC 321 105 225 112 44 68 49 60 19.1 8 M18x1.5
UC 322 110 240 117 46 71 50 62 20.6 8.5 M18x1.5
UC 324 120 260 126 51 75 55 66 20.6 9 M18x1.5
UC 326 130 280 135 54 81 58 72 22.2 9.5 M20x1.5
UC 328 140 300 145 59 86 62 76 23.8 10.5 M20x1.5
Model NO. dZ d0 D B C C1 C2 H 300 H 2300
max min max
UK 205 25 20 52 27 15 17 3.9 2.5 H 305 H 2305
UK 206 30 25 62 30 16 19 5 2.5 H 306 H 2306
UK 207 35 30 72 34 17 20 5.7 3 H 307 H 2307
UK 208 40 35 80 36 18 21 6.2 3 H 308 H 2308
UK 209 45 40 85 39 19 22 6.4 3 H 309 H 2309
UK 210 50 45 90 43 20 24 6.5 3.5 H 310 H 2310
UK 211 55 50 100 47 21 25 7 3.5 H 311 H 2311
UK 212 60 55 110 49 22 27 7.6 4 H 312 H 2312
UK 213 65 60 120 51 23 39 8.9 5 H 313 H 2313
UK 215 75 65 130 58 25 42 8.9 5 H 315 H 2315
UK 216 80 70 140 61 26 45 8.8 6 H 316 H 2316
UK 217 85 75 150 64 28 48 10 6 H 317 H 2317
UK 218 90 80 160 68 30 51 10 6 H 318 H 2318
UK 305 25 20 62 27 17 24 5.6 3 H 2305
UK 306 30 25 72 30 19 26 6 3 H 2306
UK 307 35 30 80 34 21 28 6.7 3.5 H 2307
UK 308 40 35 90 36 23 30 7.5 4 H 2308
UK 309 45 40 100 39 25 33 8.3 4 H 2309
UK 310 50 45 110 43 27 35 9.5 4.5 H 2310
UK 311 55 50 120 47 29 37 10.3 5 H 2311
UK 312 60 55 130 49 31 39 11.1 5 H 2312
UK 313 65 60 140 51 33 41 11.9 5.5 H 2313
UK 315 75 65 160 58 37 46 13.5 6 H 2315
UK 316 80 70 170 61 39 48 14.3 6.5 H 2316
UK 317 85 75 180 64 41 50 15.1 7 H 2317
UK 318 90 80 190 68 43 52 15.9 7 H 2318
UK 319 95 85 200 71 45 54 16.7 7.5 H 2319
UK 320 100 90 215 77 47 58 18.3 8 H 2320
UK 322 110 100 240 84 50 62 20.6 8.5 H 2322
UK 324 120 110 260 90 55 66 20.6 9 H 2324
UK 326 130 115 280 98 58 72 22.2 9.5 H 2326
UK 328 140 125 300 107 62 76 23.8 10.5 H 2328

Q & A

What are pillow block bearings used for?

Pillow block bearings are used to support rotating shafts and provide stable alignment in various industrial systems. They are commonly found in conveyors, agricultural machinery, packaging equipment, and automation lines.

What is the advantage of self-aligning design?

The self-aligning feature allows the bearing to compensate for shaft misalignment and installation errors, reducing stress on the system and improving service life.

What is the difference between UC, UCP, UCF, and UCFL series?

UC refers to the insert bearing itself, while UCP, UCF, and UCFL are different housing types such as pillow block, square flange, and oval flange designs.

What shaft locking methods are available?

Common locking methods include set screw locking, eccentric collar locking, and adapter sleeve mounting, each suitable for different application requirements.

Can pillow block bearings be relubricated?

Yes, most pillow block bearings are designed with grease fittings, allowing periodic relubrication to extend service life and maintain stable performance.

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