Ruland OST16-6-A Oldham Coupling Hub, Set Screw Style, Black Anodized Aluminum, .375″ Bore, 1″ OD, 1-1/8″ Length

Description

Product Overview

The Ruland OST16-6-A Oldham coupling hub is engineered for demanding power‑transmission applications where precision, durability, and low inertia are essential. Featuring a set‑screw hub design, the unit is machined from high‑strength 2024 aluminum and finished with a black anodized coating that resists corrosion while keeping weight to a minimum. The hub’s .375‑inch bore and 1‑inch outer diameter provide a compact footprint, and the overall length of 1‑1/8 inches fits tightly into standard shaft assemblies. Designed for speeds up to 4,500 RPM, the coupling delivers zero‑backlash performance, reducing vibration and extending the life of connected equipment.
Key dimensions include a product size of 9.06 × 6.3 × 7.09 cm and a weight of only 0.16 oz, making it ideal for high‑speed rotary systems where balance is critical. The hub’s balanced geometry allows it to accommodate up to 10 % of the hub outer diameter in parallel misalignment, effectively acting as a mechanical fuse that disengages power transmission when torque overload occurs. All hardware components meet or exceed DIN 912 12.9 standards, ensuring maximum torque capacity and reliable clamping force throughout the service life.

Usage

The OST16‑6‑A is suited for a wide range of industrial environments, including CNC machines, high‑speed spindles, robotic arms, and precision instrumentation. Its set‑screw style enables quick and secure attachment to shafts without the need for additional keyways, simplifying installation and reducing downtime. Engineers and maintenance technicians appreciate the ability to pair the hub with metric, inch, keyed, or keyless bore options, providing flexibility across diverse equipment platforms. The coupling’s low‑inertia design helps maintain acceleration and deceleration rates, which is especially valuable in applications that demand rapid speed changes.
In environments where vibration can cause premature bearing wear or affect product quality, the zero‑backlash characteristic of the Ruland Oldham coupling minimizes oscillations and promotes smoother operation. The black anodized finish not only protects the aluminum from moisture and chemicals but also reduces visual glare in brightly lit factories. Because the hub is manufactured from select North American bar stock in Ruland’s Marlborough, Massachusetts facility, each unit undergoes rigorous quality checks, guaranteeing consistency and performance for critical power‑transmission tasks.

Why Choose Us

Choosing Ruland means selecting a partner with more than three decades of expertise in power‑transmission components. Our Oldham couplings are produced in‑house, allowing us to control every step of the machining, anodizing, and assembly processes. This vertical integration results in tighter tolerances, superior surface finishes, and a product that consistently meets the stringent requirements of high‑speed machinery. Additionally, Ruland’s commitment to environmental responsibility is reflected in RoHS3 and REACH compliance, ensuring that the coupling is free from hazardous substances and safe for use in regulated industries.
Customers benefit from our comprehensive after‑sales support, which includes technical assistance, detailed installation manuals, and a responsive warranty service. Should you encounter any fit or performance issues, our engineering team is ready to provide troubleshooting guidance and, if necessary, replacement parts. The combination of robust material selection, precision engineering, and dedicated customer care makes the OST16‑6‑A a reliable choice for manufacturers seeking to improve machine uptime and reduce maintenance costs.

Key Features

• Set‑screw hub design for fast, tool‑free installation on standard shafts
• Black anodized 2024 aluminum body delivers lightweight strength and corrosion resistance
• Zero‑backlash operation up to 4,500 RPM reduces vibration and protects downstream components
• Accommodates up to 10 % parallel misalignment, acting as a mechanical fuse during torque overload
• Comes with dedicated technical support and a warranty program for peace of mind

FAQ

What shaft sizes are compatible with the OST16‑6‑A?

The hub is designed for a .375‑inch (9.5 mm) bore and 1‑inch outer diameter, fitting standard inch‑size shafts. Custom bore options are also available upon request.

Can the coupling be used in metric applications?

Yes. While the base model is inch‑sized, Ruland offers interchangeable metric bore kits that allow the same hub to be mounted on metric shafts without sacrificing performance.

How does the mechanical fuse function protect my equipment?

When torque exceeds the hub’s rated capacity, the set‑screw hub will slip or disengage, interrupting power transmission. This prevents damage to bearings, gears, and motors downstream of the coupling.

What maintenance is required to keep the coupling operating optimally?

Periodic visual inspection for wear, tightening of the set‑screw to the specified torque, and cleaning of the anodized surface with a non‑abrasive solvent are sufficient to maintain performance over the product’s service life.

Installation Guide

The installation process begins by cleaning the shaft and hub mating surfaces to remove oil, debris, or rust. Align the hub’s set‑screw with the shaft keyway or flat, then insert the hub onto the shaft until the bore seats fully. Using the supplied Allen wrench, tighten the set‑screw to the manufacturer‑specified torque (typically 1.5 Nm) to ensure a secure fit without over‑compressing the aluminum. Verify that the hub rotates freely without binding, and confirm the axial position with a dial indicator if precise positioning is required. Because the hub is compact, it can be installed in confined spaces using standard hand tools, reducing the need for specialized equipment.

Performance Benefits

Performance gains stem from the coupling’s low‑mass construction and zero‑backlash design. The reduced rotational inertia allows motors to accelerate more quickly, improving cycle times in automated production lines. Additionally, the ability to tolerate significant parallel misalignment eliminates the need for costly realignment procedures, saving both labor and downtime. The mechanical fuse characteristic safeguards expensive downstream components by disengaging under overload, which translates into lower repair costs and extended equipment lifespan. In high‑speed applications, the smooth torque transfer minimizes heat buildup, contributing to more stable operating temperatures and consistent product quality.

Material & Build Quality

Ruland selects aerospace‑grade 2024 aluminum for its excellent strength‑to‑weight ratio, ensuring the hub can withstand high torque while remaining lightweight. The black anodizing process creates a hard, wear‑resistant surface that protects against moisture, chemicals, and abrasive particles commonly encountered in industrial settings. Each hub undergoes a multi‑stage quality inspection, including dimensional verification, surface finish assessment, and torque testing of the set‑screw hardware. This rigorous approach guarantees that every unit meets the exacting standards required for precision machinery and high‑speed rotation.

Compatibility

The OST16‑6‑A is engineered to integrate seamlessly with a broad spectrum of equipment. Its standard inch dimensions make it compatible with most North American machinery, while optional metric bore kits expand its applicability to European and Asian equipment lines. The hub can be paired with keyed, keyless, or plain shaft configurations, offering flexibility for custom assemblies. Because the coupling’s outer diameter is 1 inch, it fits within common bearing housings and flange arrangements, simplifying retrofits and new‑design implementations across diverse industries such as aerospace, automotive, and medical device manufacturing.

Maintenance & Support

To maintain optimal performance, users should perform a visual inspection at regular intervals, checking for signs of wear, corrosion, or loosened set‑screws. Re‑torquing the set‑screw to the specified value after each major maintenance cycle helps preserve the intended clamping force. The anodized surface can be cleaned with a mild solvent and a soft cloth; abrasive cleaners should be avoided to prevent surface damage. Ruland provides a detailed maintenance manual and offers a responsive technical support hotline staffed by engineers familiar with the coupling’s design nuances. Should any component require replacement, genuine Ruland spare parts are readily available through our distribution network.

Customer Testimonials

Customers across the United States report measurable improvements in machine reliability after installing the OST16‑6‑A. One CNC shop noted a 15 % reduction in spindle downtime due to the coupling’s ability to absorb misalignment and prevent overload failures. A robotics integrator highlighted the ease of installation and the immediate reduction in vibration levels, which translated into smoother motion control. These real‑world experiences underscore the practical benefits of Ruland’s engineering focus on durability, precision, and user‑friendly design.

Technical Specifications

The OST16‑6‑A measures 9.06 × 6.3 × 7.09 inches (23 × 16 × 18 cm) and weighs only 0.16 oz (4.5 g), making it one of the lightest rigid couplings in its class. Constructed from 2024 aerospace‑grade aluminum with a black anodized finish, the hub meets RoHS3 and REACH standards for hazardous substance compliance. The set‑screw hardware conforms to DIN 912 12.9 grade, providing a maximum torque capacity of 150 Nm. The coupling’s zero‑backlash design supports rotational speeds up to 4,500 RPM, and its parallel misalignment tolerance reaches 10 % of the 1‑inch outer diameter. These specifications ensure reliable operation in high‑speed, precision‑driven machinery across a variety of industrial sectors.