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Large jaw couplings are now being offered for bore sizes up to 1-3/4” or 45 mm and torque capacities of 2,655 in-lbs (300 Nm). These new large jaw couplings are designed for use in precision systems with high deceleration and acceleration curves, such as those found in semiconductor, solar, conveyor, and warehouse automation applications.
Pre-assembled modular mounting systems are designed for adjustability across many mounting applications. Conveyor mounting systems emphasize strict parallel installation using a flange-bolt base and a conveyor rail guide. Sensor mounting systems offer flexibility in a mounting application with adjustable or 90-degree connectors, two-way bases, and various mounting brackets. Both systems include stainless steel rods (with or without scale) from 100mm to 300mm in length, zinc clamping levers, and connectors that allow adjustment of the rods’ position.
Mountable shaft collars with face holes are designed to mate directly with components such as sprockets, pulleys, and metallic plates. Ruland manufactures them with drilled holes for mounting flexibility or threaded holes for the most secure connection between the collar and mated component. They are offered in steel, aluminum, and 303 stainless steel in bore sizes ranging from 3/8” to 2” and 10mm to 50mm.
Ruland FCMR25-8-6-SS, 8mm x 6mm Six Beam Coupling, Stainless Steel, Clamp Style, 25.4mm OD, 38.1mm Length
PRODUCT SPECIFICATIONS
Ruland PCMR22-8-6-SS is a clamp style four beam coupling with 8mm x 6mm bores, 22.2mm OD, and 27.0mm length. It is machined from a single piece of material and feature two sets of two spiral cuts. This gives it higher torque capacity, lower windup, and larger body sizes than single beam couplings. PCMR22-8-6-SS is zero-backlash and has a balanced design for reduced vibration at high speeds of up to 6,000 RPM. This four beam spiral coupling is zero-backlash and has a balanced design for reduced vibration at high speeds of up to 6,000 RPM. All hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. PCMR22-8-6-SS is made from 303 stainless steel for increased torque capacity. It is machined from bar stock that is sourced exclusively from North American mills and RoHS3 and REACH compliant. PCMR22-8-6-SS is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.
PRODUCT SPECIFICATIONS
Dimensions
Bore (B1)
Larger inner diameter. Should match nominal shaft diameter.
8 mm
Small Bore (B2)
Smaller inner diameter. Should match nominal shaft diameter.
6 mm
B1 Max Shaft Penetration
The maximum depth the shaft can penetrate into Bore B1.
12.7 mm
B2 Max Shaft Penetration
The maximum depth the shaft can penetrate into Bore B2.
12.7 mm
Outer Diameter (OD)
0.875 in (22.2 mm)
Bore Tolerance
Variance in finished bore range before installation.
+0.025 mm / -0.000 mm
Length (L)
1.063 in (27.0 mm)
Recommended Shaft Tolerance
Acceptable variance in nominal shaft diameter before performance loss.
+0.000 mm / -0.013 mm
Fastening Hardware
Cap Screw
Inch or metric socket head cap screw size.
M3
Screw Material
Alloy Steel
Hex Wrench Size
Wrench size that fits the screw head to tighten or loosen the screw.
2.5 mm
Screw Finish
Surface finish and treatments on supplied hardware.
Black Oxide
Seating Torque
Torque required to install supplied hardware. Use torque wrench for accurate seating torque.
2.1 Nm
Number of Screws
2 ea
Performance Specifications
Dynamic Torque Reversing
Max torque when coupling reverses direction without stopping.
0.62 Nm
Angular Misalignment
Max angle of the shaft axes relative to each other.
3.0°
Dynamic Torque Non-Reversing
Max torque for the coupling during quick changes in acceleration or deceleration.
1.25 Nm
Parallel Misalignment
Shafts are parallel to each other, but not in-line with each other. They are offset.
0.20 mm
Static Torque
Unidirectional constant max torque.
2.49 Nm
Axial Motion
The amount shafts can move closer to or away from each other. This is meant for thermal expansion of the shafts. No axial force can be placed on the coupling.
0.13 mm
Torsional Stiffness
Measures the rigidity of the coupling. The more rigid the coupling, the less windup it will have.
1.19 Deg/Nm
Moment of Inertia
4.594 x10-6 kg-m2
Maximum Speed
6,000 RPM
Full Bearing Support Required?
Full bearing support is a bearing in close proximity to both sides of the coupling to prevent axial loads that could result in rapid coupling failure.
Yes
Zero-Backlash?
Zero-backlash ensures there is no loss of motion during operation.
Yes
Balanced Design
The balanced design allows for reduced vibration at high RPMs.
Yes
Recommended Installation Tools
Torque Wrench
This torque wrench and bit combo is recommended to ensure proper installation. A torque wrench prevents the screw from being over torqued which can lead to product failure.
Recommended Hex Key
This hex key set has the appropriate hex key for product installation. Trained and experienced assemblers can use a hex key in place of a torque wrench.
Temperature
Minimum and maximum operating temperature. Operating temperature includes ambient temperature plus or minus factors such as system heat generated during operation, washdown, vacuum, etc...
UNSPC
Code used to identify products to standardize nomenclature around the world.
31163003
Product Notes
Note 1
Torque ratings are at maximum misalignment.
Note 2
Performance ratings are for guidance only. The user must determine suitability for a particular application.
Note 3
Torque ratings for the couplings are based on the physical limitations/failure point of the machined beams. Under normal/typical conditions the hubs are capable of holding up to the rated torque of the machined beams. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the rated torque of the machined beams. Please consult technical support for more assistance.
Prop 65
Required for the US State of California only.
WARNING This product can expose you to chemicals including Ethylene Thiourea and Nickel (metallic), known to the State of California to cause cancer
Align the bores of the PCMR22-8-6-SS four beam coupling on the shafts that are to be joined and determine if the misalignment parameters are within the limits of the coupling. (Angular Misialignment: 3°, Parallel Misalignment: 0.20 mm, Axial Motion: 0.13 mm)
Fully tighten the M3 screw on one hub to the recommended seating torque of 2.1 Nm using a 2.5 mm hex torque wrench.
Before tightening the screws on the second hub, rotate the coupling by hand to allow it to reach its free length.
Tighten the screws on the second hub to the recommended seating torque. Make sure the coupling remains axially relaxed and the misalignment angle remains centered along the length of the coupling.
The shafts may extend into the relieved portion of the bore as long as it does not exceed the shaft penetration length of 12.7 mm.
WARNING This product can expose you to chemicals including Ethylene Thiourea and Nickel (metallic), known to the State of California to cause cancer
