Machine 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.

Product Media

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.	o S1	A1	A2	A3	A4	A5	A6	o A7	A8	A9	A10	A11
SS050R013A		0.3544	0.750	0.290	N/A	N/A	0.315	0.875	0.88	5/16-24 UNF	N/A	N/A	629
		0.3541	0.750	0.290	N/A	N/A	0.315	0.875	0.88	5/16-24 UNF	N/A	N/A	629
SS063R013S	SB-10	0.3940	0.650	0.330	0.44	0.127	0.354	0.800	1.00	.391-32 UNS	W-00	N-00	6200
SS063R025S		0.3936				0.125
SS063R050A
AS075R020A	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
AS088R050A	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
AS100R025A	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
AS100R050A	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
AS100R010A	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
SS100R100A		0.7873				0.188
AS125R025A
AS150R025A	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
AS150R038A		0.9842				0.188
AS150R050A
SS150R038A	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
AS200R025A		1.1810				0.188
AS200R050A
AS250R025A		1.5752	1.470	0.880	0.74	0.315	0.906	1.875	3.10	1.563-18 UNS	W-08	N-08	6308
AS250R050A		1.5747	1.470	0.880	0.74	0.313	0.906	1.875	3.10	1.563-18 UNS	W-08	N-08	6308
AS250R025A		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
AS250R050A		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

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
SS050R013A		0.3544	0.250	3.23	2.60	1.98	1.240	0.315	0.063	0.035	5/16-24 UNF	N/A	N/A	3/32 x 1/2
		0.3541	0.249	3.23	2.60	1.98	1.240	0.315	0.063	0.035	5/16-24 UNF	N/A	N/A	3/32 x 1/2
SS063R013S	FB-10	0.3940	0.312	3.50	2.75	2.25	1.515	0.354	0.825	0.050	.391-32 UNS	W-00	N-00	1/8 x 1/2
SS063R025S		0.3936	0.311
SS063R050A
AS075R020A	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
AS088R050A	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
AS100R025A	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
AS100R050A	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
AS100R010A	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
SS100R100A		0.7873	0.624
AS125R025A
AS150R025A	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
AS150R038A		0.9842	0.749
AS150R050A
SS150R038A	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
AS200R025A		1.1810	0.999
AS200R050A
AS250R025A		1.5752	1.375	8.15	5.90	5.13	4.236	0.906	2.450	0.035	1.563-18 UNS	W-08	N-08	5/16 x 1 1/2
AS250R050A		1.5747	1.374	8.15	5.90	5.13	4.236	0.906	2.450	0.035	1.563-18 UNS	W-08	N-08	5/16 x 1 1/2
AS250R025A		1.7721	1.375	8.62	6.37	5.63	4.694	0.984	2.750	0.035	1.767-18 UNS	W-09	N-09	5/16 x 1 1/2
AS250R050A		1.7716	1.374	8.62	6.37	5.63	4.694	0.984	2.750	0.035	1.767-18 UNS	W-09	N-09	5/16 x 1 1/2

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
SS050R013A		0.3544	0.250	2.45	1.82	1.320	0.315	0.035	5/16-24 UNF	N/A	N/A	3/32 x 1/2
		0.3541	0.249	2.45	1.82	1.320	0.315	0.035	5/16-24 UNF	N/A	N/A	3/32 x 1/2
SS063R013S	DB-10	0.3940	0.312	2.84	2.09	1.700	0.354	0.000	.391-32 UNS	W-00	N-00	1/8 x 1/2
SS063R025S		0.3936	0.311
SS063R050A
AS075R020A	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
AS088R050A	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
AS100R025A	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
AS100R050A	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
AS100R010A	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
SS100R100A		0.7873	0.624
AS125R025A
AS150R025A	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
AS150R038A		0.9842	0.749
AS150R050A
SS150R038A	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
AS200R025A		1.1810	0.999
AS200R050A
AS250R025A		1.5752	1.375	6.93	4.43	3.800	0.906	0.063	1.563-18 UNS	W-08	N-08	5/16 x 1 1/2
AS250R050A		1.5747	1.374	6.93	4.43	3.800	0.906	0.063	1.563-18 UNS	W-08	N-08	5/16 x 1 1/2
AS250R025A	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
AS250R050A	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