STF Models - STEPFLEX - Miki Pulley Vietnam

These couplings for servo stepping motors boast high damping performance.Our newly developed laminated rubber element (HNBR) achieves high damping and low reaction force. They absorb vibration faster than flexible couplings that use metal in their elastic components. This suppresses the resonance phenomenon that can occur with stepping motors.

[Specifications]

Model	Torque		Misalignment			Max. rotation speed ［min-1］	Torsional stiffness ［N・m/rad］	Moment of inertia ［kg・m2］	Mass ［kg］	Price ［yen］
	Nominal ［N・m］	Max. ［mm］	Parallel ［mm］	Angular ［°］	Axial ［mm］
STF-013SA1	0.5	1	0.15	1.5	±0.2	10000	15	0.11×10-6	0.004	4,010
STF-016SA1	1	2	0.15	1.5	±0.2	10000	27	0.29×10-6	0.008	3,810
STF-019SA1	1.5	3	0.15	1.5	±0.2	10000	38	0.70×10-6	0.013	3,660
STF-024SA1	2.5	5	0.15	1.5	±0.2	10000	127	1.89×10-6	0.023	4,040
STF-029SA1	4	8	0.2	1.5	±0.3	10000	201	4.40×10-6	0.034	4,250
STF-034SA1	6	12	0.2	1.5	±0.3	10000	371	9.80×10-6	0.056	4,650
STF-039SA1	8.5	17	0.2	1.5	±0.3	10000	485	21.15×10-6	0.091	5,420

*Check the Max. Torque for the Shaft Diameter list as there may be limitations on the standard and maximum torque caused by the holding power of the coupling shaft section.

*The max. rotation speed values do not take into account dynamic balance.

*The static torsional stiff ness values are analysis values for the element taken at a temperature of 20°C at maximum bore diameter.

*The moment of inertia and mass are measured for the maximum bore diameter.

[Maximum torque of shaft diameter]

Unit [N･m]

Model	Standard bore diameter d1 ［mm］	Standard bore diameter d2 ［mm］
		3	4	5	6	6.35	7	8	9	9.525	10	11	12	13	14	15	16	17	18	19
STF-013SA1	3	0.10	0.10	0.10
	4		0.25	0.25
	5			0.40
STF-016SA1	3	0.5	0.5	0.5	0.5
	4		0.6	0.6	0.6
	5			0.7	0.7
	6				0.8
STF-019SA1	3	0.8	0.8	0.8	0.8	0.8	0.8	0.8
	4		1.2	1.2	1.2	1.2	1.2	0.8
	5			1.6	1.6	1.6	1.6	0.8
	6				1.9	1.9	1.9	0.8
	6.35					1.9	1.9	0.8
	7						2.3	0.8
	8							0.8
STF-024SA1	5			1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6
	6				2.1	2.1	2.1	2.1	2.1	2.1	2.1
	6.35					2.1	2.1	2.1	2.1	2.1	2.1
	7						2.6	2.6	2.6	2.6	2.6
	8							3.3	3.3	3.3	3.3
	9								4.0	4.0	4.0
	9.525									4.0	4.0
	10										4.7
STF-029SA1	5			1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8
	6				2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2
	6.35					2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2	2.2
	7						2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7
	8							3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4
	9								4.1	4.1	4.1	4.1	4.1	4.1	4.1
	9.525									4.1	4.1	4.1	4.1	4.1	4.1
	10										4.8	4.8	4.8	4.8	4.8
	11											5.5	5.5	5.5	5.5
	12												6.3	6.3	6.3
	13													7.8	7.8
	14														8.0
STF-034SA1	5			2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7
	6				3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0
	6.35					3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0
	7						3.3	3.3	3.3	3.3	3.3	3.3	3.3	3.3	3.3	3.3	3.3
	8							4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0
	9								4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8
	9.525									4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8
	10										5.6	5.6	5.6	5.6	5.6	5.6	5.6
	11											6.5	6.5	6.5	6.5	6.5	6.5
	12												7.8	7.8	7.8	7.8	7.8
	13													9.0	9.0	9.0	9.0
	14														10.7	10.7	10.7
	15															12.0	12.0
	16																12.0
STF-039SA1	6				3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4
	6.35					3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4
	7						4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0
	8							5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0
	9								6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1
	9.525									6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1
	10										7.1	7.1	7.1	7.1	7.1	7.1	7.1	7.1	7.1	7.1
	11											8.2	8.2	8.2	8.2	8.2	8.2	8.2	8.2	8.2
	12												9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3
	13													10.4	10.4	10.4	10.4	10.4	10.4	10.4
	14														11.5	11.5	11.5	11.5	11.5	11.5
	15															12.8	12.8	12.8	12.8	12.8
	16																14.0	14.0	14.0	14.0
	17																	15.3	15.3	15.3
	18																		16.6	16.6
	19																			17.0

[Dimensions]

Unit ［mm］

Model	d1, d2		D	L	LF	S	A	C	M	Tightening torque ［N・m］
	Min.	Max.
STF-013SA1	3	5	13	18	6	6	3.9	2	1-M1.6	0.23～0.28
STF-016SA1	3	6	16	22	7.5	7	4.8	2.5	1-M2	0.4～0.5
STF-019SA1	3	8	19	25	9	7	5.8*1	3.15	1-M2.5*2	1.0～1.1*2
STF-024SA1	5	10	24	27	9	9	8.7	3.15	1-M2.5	1.0～1.1
STF-029SA1	5	14	29	30	10	10	11	3.3	1-M2.5	1.0～1.1
STF-034SA1	5	16	34	34	12	10	12.5	3.75	1-M3	1.5～1.9
STF-039SA1	6	19	39	41	15.5	10	14	4.5	1-M4	3.4～4.1

*The nominal dimensions for clamp bolt M (column M) are listed in X-MY format, where X is the number of bolt bores and Y is the nominal screw diameter. The number of bores listed is for one side only.

*For items marked with *1, d1 or d2 may range from φ3 mm to φ7 mm. *The value is 6 for a d1 or d2 of φ8 mm.

*For items marked with *2, d1 or d2 may range from φ3 mm to φ7 mm. *The value is 1-M2 for a d1 or d2 of φ8 mm. The tightening torque for M2 is 0.4 N·m to 0.5 N·m.

*The tolerance for mounting shaft dimensions for countershafts is class h7.

[Standard bore diameter]

Model	Standard bore diameter d1, d2 ［mm］
	3	4	5	6	6.35	7	8	9	9.525	10	11	12	13	14	15	16	17	18	19
STF-013SA1	●	●	●
STF-016SA1	●	●	●	●
STF-019SA1	●	●	●	●	●	●	●
STF-024SA1			●	●	●	●	●	●	●	●
STF-029SA1			●	●	●	●	●	●	●	●	●	●	●	●
STF-034SA1			●	●	●	●	●	●	●	●	●	●	●	●	●	●
STF-039SA1				●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●

*The bore diameters in the boxes marked by [●] are used as standard bore diameters.

*Check the table for information on max. torque for the shaft diameter as there may be limitations on the standard and maximum torque determined by the holding power of the coupling shaft section depending on the bore diameter used.

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