Ball Screw End Conditions

It is no surprise that Joyce/Dayton offers complete end machining to fit our standard bearing blocks. But did you know that we also provide finished machining for customer-specified end requirements? It is easy to order the finished screws - just send us your specifications.

Note: Our 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.

SB Screw End Conditions

Screw NumberBearing Mount No.oS1A1A2A3A4A5A6o A7A8A9A10A11
BS063R020A SB-12 0.4726 0.890 0.450 0.56 0.127 0.472 1.029 1.25 .469-32 UNS W-01 N-01 6301
BS063L020A 0.4723 0.125
BS075R020A SB-15 0.5908 0.930 0.490 0.56 0.127 0.512 1.094 1.38 .586-32 UNS W-02 N-02 6302
BS075R050A 0.5905 0.125
BS100R025A SB-20 0.7877 1.070 0.570 0.63 0.190 0.590 1.305 1.75 .781-32 UNS W-04 N-04 6304
BS100L025A 0.7873 0.188
BS100R050A    
BS100R100A    
BS150R100A SB-25 0.9846 1.190 0.650 0.70 0.190 0.669 1.420 2.06 .969-32 UNS W-05 N-05 6305
BS150R188A 0.9842 0.188
BS150R050A SB-30 1.1814 1.275 0.720 0.70 0.190 0.748 1.587 2.43 1.173-18 UNS W-06 N-06 6306
  1.1810 0.188
BS225R050A   1.7721 1.550 0.960 0.80 0.315 0.984 2.000 3.50 1.767-18 UNS W-09 N-09 6309
  1.7716 0.313
BS250R050A   2.1659 1.770 1.120 0.86 0.315 1.142 2.225 4.13 2.157-18 UNS W-11 N-11 6311
  2.1653 0.313
BS300R066A   2.3627 1.880 1.195 0.90 0.315 1.220 2.375 4.50 2.360-18 UNS W-12 N-12 6312
  2.3622 0.313
BS400R100A   3.1501 2.270 1.510 1.05 0.377 1.535 2.750 6.00 3.137-12 UNS W-16 N-16 6316
  3.1495 0.375

 

FB Screw End Conditions

Screw NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9A10A11
BS063R020A FB-12 0.4726 0.406 4.30 3.00 2.35 1.850 0.472 0.923 0.038 .469-32 UNS W-01 N-01 1/8 x 5/8
BS063L020A 0.4723 0.405
BS075R020A FB-15 0.5908 0.500 4.62 3.31 2.73 2.000 0.512 0.995 0.035 .586-32 UNS W-02 N-02 1/8 x 5/8
BS075R050A 0.5905 0.499
BS100R025A FB-20 0.7877 0.625 5.05 3.80 3.10 2.375 0.590 1.217 0.035 .781-32 UNS W-04 N-04 3/16 x 5/8
BS100L025A 0.7873 0.624
BS100R050A    
BS100R100A    
BS150R100A FB-25 0.9846 0.750 6.06 4.50 3.75 2.815 0.669 1.500 0.083 .969-32 UNS W-05 N-05 3/16 x 1
BS150R188A 0.9842 0.749
BS150R050A FB-30 1.1814 1.000 6.67 4.92 4.20 3.300 0.748 1.828 0.075 1.173-18 UNS W-06 N-06 1/4 x 1
  1.1810 0.999
BS225R050A   1.7721 1.375 8.62 6.37 5.60 4.694 0.984 2.750 0.035 1.767-18 UNS W-09 N-09 5/16 x 1 1/2
  1.7716 1.374
BS250R050A   2.1659 1.875 10.10 7.35 6.50 5.608 1.142 3.350 0.035 2.157-18 UNS W-11 N-11 1/2 x 1 1/2
  2.1653 1.874
BS300R066A   2.3627 2.250 11.56 8.06 7.15 6.035 1.220 3.620 0.062 2.360-18 UNS W-12 N-12 1/2 x 2
  2.3622 2.249
BS400R100A   3.1501 3.000 14.50 9.95 8.95 7.845 1.535 4.800 0.062 3.137-12 UNS W-16 N-16 3/4 x 3
  3.1495 2.998

 

DB Screw End Conditions

Screw NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9
BS063R020A DB-12 0.4726 0.406 3.29 2.00 1.566 0.472 0.000 .469-32 UNS W-01 N-01 1/8 x 5/8
BS063L020A 0.4723 0.405
BS075R020A DB-15 0.5908 0.500 3.59 2.59 2.145 0.512 0.040 .586-32 UNS W-02 N-02 1/8 x 5/8
BS075R050A 0.5905 0.499
BS100R025A DB-20 0.7877 0.625 4.00 2.88 2.378 0.590 0.040 .781-32 UNS W-04 N-04 3/16 x 5/8
BS100L025A 0.7873 0.624
BS100R050A    
BS100R100A    
BS150R100A DB-25 0.9846 0.750 4.45 2.89 2.328 0.669 0.000 .969-32 UNS W-05 N-05 3/16 x 1
BS150R188A 0.9842 0.749
BS150R050A DB-30 1.1814 1.000 5.33 3.60 3.047 0.748 0.063 1.173-18 UNS W-06 N-06 1/4 x 1
  1.1810 0.999
BS225R050A DB-45 1.7721 1.375 6.68 4.49 3.875 0.984 0.063 1.767-18 UNS W-09 N-09 5/16 x 1 1/2
  1.7716 1.374
BS250R050A   2.1659 1.875 8.40 5.40 4.700 1.142 0.063 2.157-18 UNS W-11 N-11 1/2 x 1 1/2
  2.1653 1.874
BS300R066A   2.3627 2.250 9.22 5.54 4.832 1.220 0.063 2.360-18 UNS W-12 N-12 1/2 x 2
  2.3622 2.249
BS400R100A   3.1501 3.000 11.55 6.87 6.070 1.535 0.063 3.137-12 UNS W-16 N-16 3/4 x 3
  3.1495 2.998