About Zero-Max
Precision Flexible Couplings & Motion Control Solutions
Zero-Max has been a leader in precision motion control and power transmission for over 77 years, manufacturing flexible shaft couplings, torque limiters, overhung load adaptors, and keyless bushing systems. The company specializes in zero-backlash coupling designs that handle angular, parallel, and axial shaft misalignment while maintaining rigid torsional stiffness critical for servo motors and high-precision machinery.
The Zero-Max portfolio includes Composite Disc (CD®) couplings in single- and double-flex designs with Quick Detachable (QD) bushing hubs for easy maintenance, ServoClass® metal-disc couplings for high-performance applications, Schmidt couplings for precise phase-relationship requirements, and their newer CD Power-Series designs optimized for high-speed, high-torque density scenarios.
All couplings are engineered to ISO 1940 balance standards and tested to verify runout, backlash, and misalignment capacity. Materials include ductile iron, aluminum, and stainless steel, with bore sizes from fractional inches through 6+ inches and torque capacities spanning fractional to multi-megawatt industrial drives.
Applications include precision machine tools, pumps, motors, paper machines, agitators, packaging equipment, and servo-driven automation where backlash elimination and shaft protection are non-negotiable. Zero-Max also manufactures overload safety devices (torque limiters) that protect coupled equipment from shock loads and jamming.
ChatMRO connects motion-control engineers with the exact Zero-Max coupling for their application—specify input/output bore, shaft speed, misalignment tolerance, and torque requirement, and our AI instantly surfaces compatible coupling models, balancing specifications, and lead times from our indexed 30M+ component database.
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Frequently asked questions
What does 'zero-backlash' mean and why does it matter?
Zero-backlash couplings eliminate rotational play between input and output shafts, maintaining precise phase relationship even under load changes. This is critical for servo motors, CNC spindles, and indexing tables where even 0.001" of shaft rotation error accumulates into part-dimension errors or axis tracking failures. Non-zero-backlash couplings allow several thousandths of an inch of lost motion, unacceptable in precision work.
How much shaft misalignment can a Zero-Max coupling tolerate?
Single-flex designs typically handle ±0.05–0.10" parallel offset and ±2–3 degrees angular misalignment. Double-flex designs increase these limits to ±0.15–0.20" parallel and ±4–5 degrees angular. Consult the specific coupling datasheet—exceeding limits causes premature wear and unpredictable backlash growth.
Can I replace an old rigid coupling with a Zero-Max flexible coupling?
Usually yes, but verify bore sizes and torque ratings first. Flexible couplings dampen vibration and reduce shock loads, often extending motor and bearing life. However, if your system relies on rigid coupling torque transmission for mechanical advantage, confirm with Zero-Max that the flexible alternative won't reduce effective force delivery.
What's the difference between Composite Disc (CD) and ServoClass couplings?
CD couplings use composite (nylon or fiberglass) disc elements for cost-effectiveness and vibration damping; ServoClass uses metal discs for maximum stiffness and zero-backlash performance in demanding servo applications. ServoClass costs more but delivers superior precision; CD is ideal for general industrial duty.
How do I select the right coupling bore size when adapting different motor/load shafts?
Measure both input and output shaft diameters precisely; Zero-Max offers single-size couplings (same bore on both ends) and stepped designs (different bores on input/output). For non-standard combinations, specify bore requirements and the QD bushing option, which allows quick shaft adaptation without removing the coupling from the machine.