High Quality Aluminum Alloy Flexible Shaft Coupling BC7-I Series

Overview Quick Details

Place of Origin:
Zhejiang, China
Brand Name:
Model Number:
BC7-I Series
Aluminum Alloy
Standard or Nonstandard:
Jaw / Spider
Flexible or Rigid:
Color:Light Grey:

Supply Ability

Supply Ability:
1000 Piece/Pieces per Week

Packaging & Delivery

Packaging Details
1 Piece/Plastic Bag,1 Piece/Inner Box, N Inner boxes/Ctn box.
Lead Time :

Online Customization

High Quality Aluminum Alloy Flexible Shaft Coupling

BC7-I SeriesSetscrew type

Features · Coupling assembled by pressing a polyurethane sleeve into hubs on both sides· Can absorb the vibration, parallel, angular misalignments and shaft end-play· Resistance to oil and electrical insulation· Identical clockwise and anticlockwise rotational characteristics· Two different hardness sleeves are available· Setscrew type· Material: Aluminum alloy Order Information

Example: BC7-20-5-6BC7: Series No.20: Outer Diamater 20mm Setscrew type5: D1 Bore 5mm6: D2 Bore 6mmDimension

Model InnerDia OuterDia. Length L1 L2 L3 Thread WrenchTorque Min.(Ød1/Ød2) Max.(Ød1/Ød2) ØD L M (N.m) BC7-14-d1-d2 3 7 14 22 7.5 7 3.8 M3 1.0 BC7-20-d1-d2 4 10 20 30 10.5 9 5.3 M4 1.3 BC7-25-d1-d2 5 12 25 34 10.0 12 5.5 M4 1.5 BC7-30-d1-d2 6 16 30 35 11.5 12 5.8 M4 1.7 BC7-40-d1-d2 8 24 40 55 20.0 15 10.0 M5 4.0 BC7-40L-d1-d2 8 24 40 66 25.5 15 12.8 M5 4.0 BC7-55-d1-d2 12 30 55 78 31.0 16 15.5 M6 4.0 BC7-65-d1-d2 14 38 65 90 35.5 19 17.8 M8 15.0 BC7-80-d1-d2 20 45 80 114 46.0 22 23.0 M8 15.0

Please contact us if you need specific dimensions.The dimension can be customized made according to customer’s requirements.

Product Details

Raw Material

Spare Parts

Manufacture Process

Packing Details

What’s Coupling?

Coupling is the mechanical drive which is mainly used for connecting shaft and shaft (sometimes coupling spindle other rotary parts) with the transfer motion and torque, and also it is the commonly used components used for safety devices. Mechanical running can’t be separated from two axis; Only be separated in the mechanical parking and coupling apart from two axis.

In addition, coupling is able to complement the axial direction, angular and shaft end-play and absorb vibration, thus it can prolong mechanical life, improve the operation quality and stability of the machine.

Installation Caution

lIt must be calibrated and adjusted when installing the coupling.




lMisalignments are sometimes caused not only by equipment assembly, but also by vibration, heat expansion, wear of bearings, etc, during operation. Therefore, it is recommended to adjust the shaft misalignment to be below 1/3 of maximum values.

lThe allowable axis deviation of coupling contains the following three types:

Calculate Motor Torque

When we know the motor watt, we can calculate the motor torque using the following formula.

Motor torque T(N. m)=kW×9550 rpm

Calculate Coupling Torque

When calculate the motor rated torque and select the adjustment factor, the coupling torque can calculate using the following formula.


T1: Motor rated torque K1: Operating Coefficient by Load Character

K2: Corrected Coefficient by Operating Hours

K3: Corrected Coefficient by Start and Braking

Load Character K1



Small Fluctuations


Medium Fluctuations


Large Fluctuations


Operating Hours FactorK2


≤2 Hour


≤4 Hour


≤8 Hour


≤16 Hour


≤24 Hour


Start and Braking Frequency Coefficient K3


≤10 times


≤30 times


≤60 times


≤120 times


≤240 times


Main Couplings Attachment Type:

Setscrew type:Two setscrews have a angle of 90 °, this low-cost type features the most conventional attachment. However, the point of setscrew may cause damage to the shaft and may be difficult to remove.

Clamp Type:This type is clamped on the shaft by tightening the socket head cap screws. Attachment and removal is easy, and no shaft damage results.