February 22, 2021

S-Flex Coupling Selection System
The choice process for identifying the proper S-Flex coupling needs using the charts shown over the following pages. You can find three elements to get selected, two flanges and a single sleeve.
Information important in advance of a coupling may be selected:
HP and RPM of Driver or running torque
Shaft dimension of Driver and Driven gear and corresponding keyways
Application or equipment description
Environmental problems (i.e. extreme temperature, corrosive problems, room limitations)
Methods In Picking out An S-Flex Coupling
Phase 1: Establish the Nominal Torque in in-lb of one’s application through the use of the following formula:
Nominal Torque = (HP x 63025)/RPM
Phase two: Making use of the Application Support Factor Chart 1 decide on the support element which best corresponds to your application.
Stage 3: Calculate the Design Torque of the application by multiplying the Nominal Torque calculated in Step one through the Application Support Aspect determined in Stage 2.
Layout Torque = Nominal Torque x Application Support Component
Stage 4: Utilizing the Sleeve Functionality Data Chart 2 pick the sleeve materials which best corresponds to your application.
Step five: Making use of the S-Flex Nominal Rated Torque Chart three find the suitable sleeve material column for your sleeve selected in Step four.
Step 6: Scan down this column towards the 1st entry in which the Torque Worth inside the column is better than or equal on the Layout Torque calculated in Phase 3.
Refer for the greatest RPM worth of your coupling size to ensure the application necessities are met. In the event the greatest RPM worth is less compared to the application requirement, S-Flex couplings will not be advisable to the application.
If Nominal Torque is significantly less than 1/4 from the coupling’s nominalrated torque, misalignment capacities are decreased by 1/2. When torque value is located, refer towards the corresponding coupling dimension while in the initially column on the S-Flex Nominal Rated Torque Data Chart 3 .
Step seven: Examine the application driver/driven shaft sizes for the greatest bore size offered over the coupling picked. If coupling max bore just isn’t substantial enough for the shaft diameter, pick the subsequent largest coupling that could accommodate the driver/driven shaft diameters.
Step eight: Using the Item Choice tables, obtain the proper Keyway and Bore dimension essential and find the amount.