Ball Screw Bearing Blocks

Joyce/Dayton bearing mounts are sealed and greased at the factory.  They are suited for high duty cycle conditions where frictional forces cause a thermal transfer of energy into the screw assembly. The resulting thermal migration will cause the screw to expand axially. Screw end machining and fit of the bearing support are designed to account for this expansion.

See the table below for dimensional details based on ball screw part numbers. Bearing blocks used in screw & nut assemblies may not be rated for the same static load as the screws or nuts with which they are used. Contact Joyce/Dayton to verify that bearing blocks are adequately sized for the required loads.

Standard bearing blocks are available for most screw diameters between 5/8 inch and 1 1/2 inch diameters. See the chart below for more details.

SB Bearing Blocks

simple single bearing block SB

Screw NumberBearing Mount No.ABCDEFGHIJK
BS063R020A SB-12 3.000 1.875 1.000 0.375 1.125 1.125 2.250 0.672 1.344 .281 (4x) .406 Thru
BS063L020A .625 C'Bore
  .875 Deep
BS075R020A SB-15 3.500 2.125 1.125 0.375 1.375 1.250 2.500 0.813 1.625 .281 (4x) .406 Thru
BS075R050A .625 C'Bore
  1.000 Deep
BS100R025A SB-20 4.500 2.750 1.438 0.500 1.750 1.625 3.250 0.938 1.875 .469 (4x) .656 Thru
BS100L025A 1.000 C'Bore
BS100R050A 1.312 Deep
BS100R100A  
BS150R100A SB-25 6.500 3.690 1.875 0.875 2.000 2.375 4.750 0.970 1.940 .656 (4x) .906 Thru
BS150R188A 1.375 C'Bore
  1.750 Deep
BS150R050A SB-30 6.500 3.690 1.875 0.875 2.000 2.375 4.750 1.156 2.312 .656 (4x) .906 Thru
  1.375 C'Bore
  2.060 Deep


FB Bearing Blocks

fixed double bearing blocks FB12-15b

fixed double bearing blocks FB20-30b

Screw NumberBearing Mount No.ABCDEFGHIJKL
BS063R020A FB-12 3.000 1.875 1.000 1.125 4.262 0.438 2.250 1.688 1.063 2.125 .250 Thru .406 Thru
BS063L020A .375 C'Bore .625 C'Bore
  #5 Taper Pin 1.130 Deep
BS075R020A FB-15 3.500 2.125 1.125 1.250 4.585 0.500 2.500 1.875 1.188 2.375 .250 Thru .406 Thru
BS075R050A .375 C'Bore .625 C'Bore
  #5 Taper Pin 1.310 Deep
BS100R025A FB-20 4.500 2.750 1.438 1.625 5.015 0.937 3.250 N/A 2.125 2.750 .437 Thru .688 Thru
BS100L025A .687 C'Bore 1.000 C'Bore
BS100R050A #8 Taper Pin 1.625 Deep
BS100R100A    
BS150R100A FB-25 6.500 3.690 1.875 2.375 5.977 0.970 4.750 N/A 2.750 3.250 .437 Thru .937 Thru
BS150R188A .687 C'Bore 1.375 C'Bore
  #8 Taper Pin 2.250 Deep
BS150R050A FB-30 6.500 3.690 1.875 2.375 6.595 1.156 4.750 N/A 3.225 3.725 .437 Thru .937 Thru
  .687 C'Bore 1.375 C'Bore
  #8 Taper Pin 2.250 Deep


DB Bearing Blocks

simple double bearing block DB12-30b

simple double bearing blocks DB45b

Screw NumberBearing Mount No.ABCDEFGHIJKL
BS063R020A DB-12 3.000 1.875 1.000 0.375 1.125 1.125 2.250 0.672 1.344 .281 (4x) .406 Thru N/A
BS063L020A .625 C'Bore
  .875 Deep
BS075R020A DB-15 3.500 2.125 1.125 0.375 1.375 1.250 2.500 0.813 1.625 .281 (4x) .406 Thru N/A
BS075R050A .625 C'Bore
  1.000 Deep
BS100R025A DB-20 4.500 2.750 1.438 0.500 1.750 1.625 3.250 0.938 1.875 .469 (4x) .656 Thru N/A
BS100L025A 1.000 C'Bore
BS100R050A 1.312 Deep
BS100R100A  
BS150R100A DB-25 6.500 3.690 1.875 0.875 2.000 2.375 4.750 0.970 1.940 .656 (4x) .906 Thru N/A
BS150R188A 1.375 C'Bore
  1.750 Deep
BS150R050A DB-30 6.500 3.690 1.875 0.875 2.000 2.375 4.750 1.156 2.312 .656 (4x) .906 Thru N/A
  1.375 C'Bore
  2.060 Deep
BS224R050A DB-45 8.500 5.625 2.813 1.000 3.625 3.313 6.625 0.873 3.468 .813 (4x) 1.013 Thru 1.720
  1.563 C'Bore
  3.500 Deep