Roller chain couplings are extremely simple but provide a compact and flexible coupling that is suitable for an extremely wide range of applications. Because of the design, the torque is distributed throughout the roller chain and sprocket teeth, so there is an even amount of torque distributed throughout the coupler when in motion. Another good thing about a roller chain coupling is that the sprockets and chain produce a slight clearance, which means that absolute shaft alignment is not requited for the coupling to function, however it is highly recommended to have the shafts completely aligned, if possible. Chain couplers comprise a double-row roller chain, two sprockets, and sometimes a coupling cover. We stock both ANSI and Metric chain couplings!
The coupling roller chains we supply are manufactured using components that have been heat-treated, shot-peened, and hardened for maximum strength and durability. A coupling chain is typically a double-row roller chain made to ANSI or British Standards. We supply a range of American and Metric coupling chain sizes.
Another major component is the coupling sprockets. Our coupling chain sprockets are manufactured with high-quality steel. The teeth are then heat treated and hardened; then, the sprocket has a black oxide finish for corrosion resistance. When creating a new coupling, matching the correct sprocket and chain is important. For Example, the #4016 coupling chain goes with a 4016 sprocket. Select the "More Info" button for our standard coupling sprockets; we also supply custom sprockets upon request!
A chain coupling cover, or the housing, is manufactured from high-quality aluminum, includes seals, and is painted yellow. Not only does having a coupling cover provide a huge safety benefit, but it also keeps lubricant on the chain, making the whole coupling assembly look clean and neat.
How To Install a Roller Chain Coupling
Installing a complete roller chain coupling is a simple and easy task. Refer to the instructions below for the details on how to install.
Step 1: Place the oil seals supplied with the coupling cover onto the sprocket halves.
Step 2: Adjust the angular misalignment ("α" symbol) so that the width of the tooth surface (T) is the same around the circumference of the sprockets; the allowable angular misalignment is 1°. Next, you will place a straight edge at the bottom of the corresponding teeth of the two sprockets and adjust it so that the offset misalignment is minimized. The allowable offset misalignment (ε) is 2% of the chain pitch. However, when the sprocket speed is 1/3 or more of the maximum speed, the allowable angular and offset misalignments are 0.5° and 1% of the chain pitch.
Step 3: Measure the distance between the sprocket faces (C) and firmly fasten the sprocket halves to the shafts.
Step 4: Lubricate the coupling chain with chain lube, which we can also supply, then wrap the chain around both sprockets and fix it with a connecting pin. Regarding lubrication for the chain, you can apply chain lube regularly or install a coupling cover filled with grease/ lube and change it every 1,000 - 2,000 hours, depending on the application and chain lube used. Contact our customer support team to find out the best lubrication to use and re-lube schedule.
Step 5: Fasten the coupling cover firmly, and do not forget to use the supplied seals.
Important Notes: 1. During high-speed operations or conditions of large vibration, use locking cement when fastening bolts/ screws. 2. Install a coupling cover when there is a risk of chain breakage or any safety hazard factors. 3. The ambient temperature range is 14° to 140° Fahrenheit. If you are using a roller chain coupler outside of this range, don't hesitate to contact our customer support team to consult for solutions.
