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?

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.

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END FIXITY SB BEARING BLOCKS AND SCREW END CONDITIONS DB BEARING BLOCKS AND SCREW END CONDITIONS FB BEARING BLOCKS AND SCREW END CONDITIONS SCREW AND NUT SELECTION GUIDE

SB Screw End Conditions

simple single bearing block SB

Screw Number	Bearing Mount No.	oS1	A1	A2	A3	A4	A5	A6	o A7	A8	A9	A10	A11
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	SB-12	0.4723	0.890	0.450	0.56	0.125	0.472	1.029	1.25	.469-32 UNS	W-01	N-01	6301
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	SB-15	0.5905	0.930	0.490	0.56	0.125	0.512	1.094	1.38	.586-32 UNS	W-02	N-02	6302
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	SB-25	0.9842	1.190	0.650	0.70	0.188	0.669	1.420	2.06	.969-32 UNS	W-05	N-05	6305
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
	SB-30	1.1810	1.275	0.720	0.70	0.188	0.748	1.587	2.43	1.173-18 UNS	W-06	N-06	6306
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	1.550	0.960	0.80	0.313	0.984	2.000	3.50	1.767-18 UNS	W-09	N-09	6309
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	1.770	1.120	0.86	0.313	1.142	2.225	4.13	2.157-18 UNS	W-11	N-11	6311
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	1.880	1.195	0.90	0.313	1.220	2.375	4.50	2.360-18 UNS	W-12	N-12	6312
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	2.270	1.510	1.05	0.375	1.535	2.750	6.00	3.137-12 UNS	W-16	N-16	6316

FB Screw End Conditions

simple single bearing block SB

Screw Number	Bearing Mount No.	oS1	oS2	A1	A2	A3	A4	A5	A6	A7	A8	A9	A10	A11
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	FB-12	0.4723	0.405	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
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	FB-15	0.5905	0.499	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
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	FB-25	0.9842	0.749	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
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
	FB-30	1.1810	0.999	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
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	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
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	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
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	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
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	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

DB Screw End Conditions

simple single bearing block SB

Screw Number	Bearing Mount No.	oS1	oS2	A1	A2	A3	A4	A5	A6	A7	A8	A9
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	DB-12	0.4723	0.405	3.29	2.00	1.566	0.472	0.000	.469-32 UNS	W-01	N-01	1/8 x 5/8
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	DB-15	0.5905	0.499	3.59	2.59	2.145	0.512	0.040	.586-32 UNS	W-02	N-02	1/8 x 5/8
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	DB-25	0.9842	0.749	4.45	2.89	2.328	0.669	0.000	.969-32 UNS	W-05	N-05	3/16 x 1
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
	DB-30	1.1810	0.999	5.33	3.60	3.047	0.748	0.063	1.173-18 UNS	W-06	N-06	1/4 x 1
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
	DB-45	1.7716	1.374	6.68	4.49	3.875	0.984	0.063	1.767-18 UNS	W-09	N-09	5/16 x 1 1/2
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	8.40	5.40	4.700	1.142	0.063	2.157-18 UNS	W-11	N-11	1/2 x 1 1/2
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	9.22	5.54	4.832	1.220	0.063	2.360-18 UNS	W-12	N-12	1/2 x 2
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	11.55	6.87	6.070	1.535	0.063	3.137-12 UNS	W-16	N-16	3/4 x 3