About Tollok
Tollok Shaft Coupling & Locking SolutionsRegal Rexnord
Tollok, a Regal Rexnord subsidiary with over 40 years of application expertise, manufactures highly engineered shaft locking devices and couplings for power generation, process industries, and critical mechanical transmission systems. The brand is recognized for solving one of rotating machinery's toughest problems: securing shafts against slipping, managing torque transmission reliably, and minimizing vibration and shaft bending in high-speed, high-load environments where downtime is costly.
Tollok's core innovation is the cone clamping element—a self-centering, keyless locking device that grips shafts hydraulically or mechanically without keyways, set screws, or complex fastening. These elements are available in diameters from 6 mm to 130 mm, offering medium-to-high torque capacity and minimal radial encumbrance (the space a coupling takes up perpendicular to the shaft line). Unlike traditional keyed shafts that require precise machining and leave stress concentration points, Tollok cone elements distribute clamping force evenly, reducing shaft stress and extending bearing life.
The TLK500 series rigid couplings complement the cone elements, providing solid shaft-to-shaft torque transmission with minimal backlash. For example, the T500030X060 model delivers up to 550 N·m (407 ft·lbs) of torque capacity with 30 mm bore and 60 mm body diameter, suitable for high-speed industrial drivetrains where angular misalignment or end-float cannot be tolerated. Rigid couplings are preferred in precise gearbox input shafts, turbine couplings, and synchronous belt drive applications.
Tollok's engineering differentiator lies in reducing process variability and protecting critical equipment: by securing shafts against micro-slipping and managing vibration transmission, Tollok couplings help plant operators extend equipment intervals, improve machine accuracy, and lower maintenance labor. Applications span wind turbine gearboxes, centrifuge drives, chemical reactor mixers, and printing press drive systems.
ChatMRO's search instantly helps engineers and maintenance teams find the right Tollok coupling by shaft diameter, torque requirement, or application type—whether locking a pump impeller, coupling a gearbox output, or securing a rotating valve stem. Specify the coupling bore diameter, maximum torque, and shaft material, and ChatMRO connects you to compatible Tollok elements and complete coupling assemblies in seconds.
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Frequently asked questions
Why choose a Tollok keyless cone coupling over a traditional keyed shaft connection?
Tollok cone clamping elements eliminate keyways, which are stress-concentration points that weaken shafts and are prone to fretting corrosion and fatigue cracking under vibration. Keyless designs distribute clamping force evenly across the shaft diameter, reducing localized stress by 30–50%, extending shaft and bearing life, and enabling quick, non-destructive removal and reinstallation without unloading the entire machine. This is critical in power-generation and high-speed process equipment where downtime costs exceed $10,000/hour.
What torque capacity should I specify for a Tollok coupling on a centrifuge or high-speed rotating load?
Specify the coupling for at least 1.5x the continuous operating torque plus a margin for start-up shock and transient overloads (e.g., if your centrifuge gearbox output is 300 N·m continuous, select a Tollok coupling rated for 450+ N·m). The coupling's service factor should account for your machinery's duty cycle: continuous industrial processes need 1.5x margin, intermittent or batch processes can use 1.25x margin. Undersizing risks slipping or coupling failure; oversizing increases cost and radial encumbrance but improves reliability.
Can Tollok shaft couplings be used on misaligned shafts, or are they rigid-only?
Standard Tollok TLK500 rigid couplings are designed for truly aligned shafts (angular misalignment under 0.05°); they transmit torque but cannot accommodate end-float or radial run-out. For applications with minor shaft misalignment or vibration isolation needs, Tollok offers flexible coupling variants and hydraulic locking elements designed to absorb small angular offsets while maintaining torque transmission and minimizing backlash.
How do I install a Tollok cone clamping element without disassembling the entire machine?
Tollok cone elements are installed by sliding the element onto the shaft and then applying controlled hydraulic pressure via a dedicated pump or manual hand pump supplied by Tollok, which forces the cone to expand and grip the shaft. Once installed, no additional tools or fasteners are needed. Removal requires reversing the hydraulic pressure; this non-destructive approach allows in-field coupling changes without bearing removal or shaft handling, reducing downtime from hours to minutes.
What materials and surface finishes does Tollok use for shafts, and are they compatible with corrosive or high-temperature environments?
Tollok couplings are typically supplied with carbon steel or alloy steel shafts with various surface finishes: plain machined, chrome-plated (for corrosion resistance), nitrided (for wear hardness), or stainless steel (for aggressive chemical or marine environments). For high-temperature applications (above 200°C), special heat-treated alloy steels are available. Verify surface finish and material grade against your equipment's environmental specs (salt-spray, high humidity, chemical exposure, thermal cycling) to ensure long-term reliability.