Linear Bearings Catalog Section - Thomson - #51

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www.danahermotion.com 63 Thomson RoundRail Linear Guides and Components Inch Ball Bearing Bushing Inch – Super Ball Bushing Bearings Super Ball Bushing Twin Pillow Blocks (Open Type) for Continuously Supported Applications Super Ball Bushing Twin Pillow Blocks (Open Type, seal at both ends) and 60 Case LinearRace (Dimensions in inches) Part Number (3) Nominal Diameter H ±.003 H1 A A1 A2 B 60 Case LinearRace Minimum Depth of Hardness 60 Case Solid LinearRace Mass lb/in 60 Case LinearRace Super Ball Bushing Mounting Holes Twin Pillow Block 60 Case LinearRace X Y N1 TWN-8-OPN 1/2 L PD .500 .687 1.13 2.00 .69 .75 3.50 .04 .06 4 2 #6-32 TWN-10-OPN 5/8 L PD .625 .875 1.44 2.50 .88 .94 4.00 .04 .09 4 2 #8-32 TWN-12-OPN 3/4 L PD .750 .937 1.56 2.75 .94 1.00 4.50 .06 .13 6 3 #10-32 TWN-16-OPN 1 L PD 1.000 1.187 2.00 3.25 1.19 1.25 6.00 .08 .22 6 3 1/4-20 TWN-20-OPN 1 1/4 L PD 1.250 1.500 2.56 4.00 1.50 1.63 7.50 .08 .35 6 3 5/16-18 TWN-24-OPN 1 1/2 L PD 1.500 1.750 2.94 4.75 1.75 1.88 9.00 .08 .50 8 4 3/8-16 Part Number (3) 60 Case LinearRace Diameter d E ±.010 E1 ±.010 E2 Min. F1 G G1 N Pillow Block Mass lb Dynamic (1) Load Capacity lbf Super Ball Bushing Twin Pillow Block Hole Bolt TWN-8-OPN .4995/.4990 2.500 1.688 .31 .25 .56 1.75 .16 #6 .4 460 TWN-10-OPN .6245/.6240 3.000 2.125 .37 .28 .67 2.00 .19 #8 .8 640 TWN-12-OPN .7495/.7490 3.500 2.375 .43 .31 .94 2.25 .19 #8 1.0 940 TWN-16-OPN .9995/.9990 4.500 2.875 .56 .38 1.20 3.00 .22 #10 2.0 1560 TWN-20-OPN 1.2495/1.2490 5.500 3.500 .62 .44 1.50 3.75 .22 #10 4.2 2340 TWN-24-OPN 1.4994/1.4989 6.500 4.125 .75 .50 1.75 4.50 .28 .25 6.7 3120 (1) The Dynamic Load Capacity is based on a rated travel life of 2 million inches. The actual Dynamic Load Capacity can be affected by the orientation of the bearing or the direction of the applied load. For dynamic load correction factors see polar graphs below. (3) For part number description and specifications see page 56. Note: For additional technical information, see the Engineering section beginning on page 245. † Size .500 has oil lubricant fitting. Sizes .625 and above have 1/4-28 access for lubrication. N1 d A H1 E2 30° A1 A2 E1 X Y E B F1 H N Access for Lubrication† TWN-OPN End view TWN-OPN Side view Retention Pin Adjusting Screw G1 G