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Slit Couplings
Ruland slit couplings, offered by Pacific International Bearing Sales, are precision-engineered for high-performance motion control applications requiring zero-backlash, smooth torque transmission, and low bearing loads. Manufactured from a single piece of 7075 aluminum with a patented slit pattern, they deliver a unique balance of high torsional stiffness, misalignment accommodation, and vibration resistance—ideal for motor-to-ball screw or gearbox connections in industries such as medical, semiconductor, solar, and test and measurement. Available in two styles: the RL-series for greater stiffness and misalignment handling, and the RS-series for high-speed, compact setups. Clamp and set screw versions are offered, with set screw styles supporting speeds up to 70,000 RPM and micro-bore sizes as small as 1.5mm. Slit couplings are RoHS3 and REACH compliant and stocked in bore sizes from 1.5mm to 12mm and 1/8” to 3/8”.
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FREQUENTLY ASKED QUESTIONS
What is a slit coupling?
A slit coupling is a zero-backlash, single-piece aluminum coupling that uses a patented slit pattern to transmit torque while accommodating misalignment and damping vibration. The slit geometry gives it both high torsional stiffness and flexibility for precision motion control.
When should I use a slit coupling instead of a beam or bellows coupling?
Slit couplings are ideal when you need a combination of smooth torque transmission, low bearing loads, and excellent vibration resistance in a very compact package. They are especially well suited for motor-to-ball screw or gearbox connections in medical, semiconductor, solar, and test and measurement equipment.
What is the difference between RL-series and RS-series slit couplings?
RL-series slit couplings are designed for greater stiffness and misalignment handling, making them a good choice where higher torque and rigidity are required. RS-series couplings prioritize high speed and compact size, making them suitable for small, high-speed servo or stepper axes.
What materials and configurations are available?
Ruland slit couplings are machined from a single piece of 7075 aluminum for high strength and low inertia. They are offered in both clamp and set screw versions, with options to match different mounting preferences and packaging constraints.
What speeds and bore sizes can slit couplings support?
Set screw versions can operate at speeds up to 70,000 RPM, depending on size and system conditions. Bore options include micro bores as small as 1.5 mm, with stocked ranges from 1.5–12 mm and 1/8″–3/8″ to cover typical miniature motor and shaft diameters.
Are slit couplings RoHS and REACH compliant?
Yes. Ruland slit couplings are RoHS3 and REACH compliant, making them suitable for use in regulated and global markets where environmental and material compliance is required.
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