KTR
TOOLFLEX S Couplings
Engineering selection page for KTR TOOLFLEX S metal bellows couplings - catalogue sizes, torque, speed, dimensions and torsional stiffness.
Family overview
Metal bellows couplings
KTR TOOLFLEX S couplings are backlash-free, torsionally stiff metal bellows couplings with stainless steel bellows and aluminium hubs. The standard catalogue covers sizes 5 to 45.
Engineering characteristics
Selection fundamentals
- Rated torque and speed values follow the TOOLFLEX S specification table in the catalogue source.
- Hubs are available with setscrew mounting (Type 1.1) or clamping hubs (Type 2.5) per catalogue notes.
- Torsional stiffness is tabulated for the standard S-type configuration.
- Misalignment limits are not stated in the available size sheets and must be confirmed against application duty.
Selection guidance
Choosing a TOOLFLEX S size
- Define shaft bore (Dmax), rated torque duty and maximum operating speed.
- Compare hub outside diameter and overall length against machine envelope constraints.
- Review torsional stiffness for servo positioning and resonance requirements.
- Confirm hub mounting type (setscrew vs clamping) against shaft access and dynamic duty.
- Open the size PDP for catalogue dimensions before sending an engineering enquiry.
TOOLFLEX S size range
Select a catalogue size to review rated torque, bore, speed, hub diameter, overall length and torsional stiffness.
TOOLFLEX S 5
Size
5
Rated torque
1.5 Nm rated torque
Max bore
10 mm Dmax
Max speed
20000 rpm max speed
Hub diameter
20 mm hub dia.
Length
30.5 mm length
Stiffness
380 Nm/rad stiffness
Hub material
Aluminium
View TOOLFLEX specifications
TOOLFLEX S 7
Size
7
Rated torque
4 Nm rated torque
Max bore
14 mm Dmax
Max speed
20000 rpm max speed
Hub diameter
30 mm hub dia.
Length
41 mm length
Stiffness
1120 Nm/rad stiffness
Hub material
Aluminium
View TOOLFLEX specifications
TOOLFLEX S 9
Size
9
Rated torque
10 Nm rated torque
Max bore
20 mm Dmax
Max speed
20000 rpm max speed
Hub diameter
40 mm hub dia.
Length
48 mm length
Stiffness
2500 Nm/rad stiffness
Hub material
Aluminium
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TOOLFLEX S 12
Size
12
Rated torque
15 Nm rated torque
Max bore
25 mm Dmax
Max speed
15000 rpm max speed
Hub diameter
45 mm hub dia.
Length
53 mm length
Stiffness
3800 Nm/rad stiffness
Hub material
Aluminium
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TOOLFLEX S 16
Size
16
Rated torque
30 Nm rated torque
Max bore
30 mm Dmax
Max speed
15000 rpm max speed
Hub diameter
55 mm hub dia.
Length
68 mm length
Stiffness
8200 Nm/rad stiffness
Hub material
Aluminium
View TOOLFLEX specifications
TOOLFLEX S 20
Size
20
Rated torque
50 Nm rated torque
Max bore
38 mm Dmax
Max speed
10000 rpm max speed
Hub diameter
65 mm hub dia.
Length
82 mm length
Stiffness
15000 Nm/rad stiffness
Hub material
Aluminium
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TOOLFLEX S 30
Size
30
Rated torque
120 Nm rated torque
Max bore
45 mm Dmax
Max speed
8000 rpm max speed
Hub diameter
80 mm hub dia.
Length
100 mm length
Stiffness
35000 Nm/rad stiffness
Hub material
Aluminium
View TOOLFLEX specifications
TOOLFLEX S 38
Size
38
Rated torque
200 Nm rated torque
Max bore
55 mm Dmax
Max speed
6000 rpm max speed
Hub diameter
95 mm hub dia.
Length
115 mm length
Stiffness
65000 Nm/rad stiffness
Hub material
Aluminium
View TOOLFLEX specifications
TOOLFLEX S 45
Size
45
Rated torque
340 Nm rated torque
Max bore
65 mm Dmax
Max speed
5000 rpm max speed
Hub diameter
120 mm hub dia.
Length
135 mm length
Stiffness
115000 Nm/rad stiffness
Hub material
Aluminium
View TOOLFLEX specifications
Request an Engineering Quote
Share shaft bore, speed, torque duty and ordering designation. Golden Bearing Company supports KTR TOOLFLEX selection using catalogue engineering data. Contact us with shaft bore, speed, torque duty and configuration requirements for quotation review.