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ST-UU : Ordinary Sealed Type

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ST-UU Type : Ordinary Sealed Type Stroke Rotary Bushings

ST-UU Stroke Rotary Bushings

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20+ 5%

40+ 10%

60+ 15%

100+ 20%

200+ 35%

Part Number	Shaft Dia.	Weight (g)	Max Stroke	ØB	ØD	L	L1	T	t	r	Basic Dynamic Load Rating C kgf	Basic Static Load Rating Co kgf	Cost	Quantity	Add to Basket
ST8UU	8	16.5	14	8	15	24	12.3	1.5	0.5	0.5	32	21	£27.37
ST10UU	10	30.7	16	10	19	30	15.5	1.5	0.5	0.5	67	48	£28.80
ST12UU	12	45.0	17	12	23	32	17.1	1.5	0.5	0.5	110	84	£30.88
ST16UU	16	74.0	24	16	28	37	21.1	1.5	0.5	0.5	130	100	£34.37
ST20UU	20	107.0	32	20	32	45	26.8	2.0	0.5	0.5	140	130	£35.95
ST25UU	25	121.0	32	25	37	45	26.8	2.0	0.5	1.0	150	140	£46.97
ST30UU	30	215.0	65	30	45	65	45.1	2.5	0.5	1.0	320	320	£57.74
ST35UU	35	342.0	75	35	52	70	50.1	2.5	0.7	1.5	340	360	£68.12
ST40UU	40	529.0	91	40	60	80	59.9	2.5	0.7	1.5	440	490	£86.40
ST45UU	45	577.0	91	45	65	80	59.9	2.5	0.7	1.5	460	540	£115.41
ST50UU	50	836.0	120	50	72	100	77.4	3.0	1.0	1.5	590	710	£158.25
ST55UU	55	1190.0	120	55	80	100	77.4	3.0	1.0	2.0	620	780	£219.63
ST60UU	60	1270.0	120	60	85	100	77.4	3.0	1.0	2.0	640	840	£204.78
ST70UU	70	1430.0	120	70	95	100	77.4	3.0	1.0	2.0	660	950	£237.28
ST80UU	80	2080.0	114	80	110	100	77.0	3.0	1.5	2.0	840	1250	£324.30
ST90UU	90	2290.0	114	90	120	100	77.0	3.0	1.5	2.0	870	1370	£395.82
ST100UU	100	2540.0	114	100	130	100	77.0	3.0	1.5	2.0	900	1510	£467.43

Material
Carbon Steel

Fit
The fit of Stroke Rotary Bushing with shaft and housing is recommend as shown in Table 1.

TABLE 1 - Fit
General Application		Vertical Axis or High Accuracy
Shaft	Housing	Shaft	Housing
k5.m5	H6.H7	n5.p6	J6.J7

Since this series may function in both rotary and linear directions at the same time, radial clearance should be held to minimum if shock load is applied or vibration is present during the operation.
When this series is used in a vertical axis or very accurate movement is required, it is especially recommended to use zero or minimal preload.
However, since excess preload shortens life, radial clearance smaller than the values shown in Table 2 should not be used.

TABLE 2 - Minimum Radial Clearance
Inscribed Circle Diameter dr mm		Minimum Value of Radial Clearance
Over	Incl.	Minimum Value of Radial Clearance
4	6	-2
6	10	-3
10	18	-4
18	20	-5
30	50	-6
50	80	-8
80	100	-10

Allowable Limit of Speed
Stroke Rotary Bushing series can operate in both linear and rotary directions at the same time.
The allowable limit of speed when linear motion and rotation occur at the same time can be obtained from the following formula.

DN=> dp n + 10 S n 1....(6), where;

DN = Limit of Speed (ref. table 3)
n = No. of revolutions per minute, Rpm.
n1 = No. of strokes per min., cpm
S = Stroke length, mm
dp = Pitch circle dia. of balls, mm (dp = 1.15dr)
dr = inscribed circle dia., mm
This formula is only applicable when n1 <=5000 and Sn1 <= 50000

Limiting Values in general are shown in Table 3.

TABLE 3 - Limit of Speed
Terms of Lubrication	DN
Oil	600000
Grease	300000

Other Info.
Actual Stroke Length should be less than 80% of max. stroke.
Mating Shafts should be HRC58-64. Surface roughness 0.85 or better.
We recommend our linear shafting Z-A or Z-B types. Oil holes provided for lubrication.

Downloads
PDF Documents : Catalogue Page