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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 BCLK21-1/2"-9MM-A is a bellows coupling with increased misalignment with 0.5000" x 9mm bores, 1.313" (33.3mm) OD, 1.962" (49.8mm) length, and 1/8" x 3mm keyways. It has more convolutions than comparably sized high stiffness styles allowing for increased misalignment for high-performance applications where shaft misalignment is harder to control. BCLK21-1/2"-9MM-A is comprised of two anodized aluminum hubs and a stainless steel bellows for lightweight and low inertia. It is also engineered with a balanced design for reduced vibration at high speeds up to 10,000 RPM. The thin walls of the bellows are able to flex while remaining rigid under torsional loads allowing for the accommodation of all forms of misalignment. Hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. BCLK21-1/2"-9MM-A is machined from meticulously selected bar stock that is sourced exclusively from North American mills. It is carefully made in our ISO 9001:2015 advanced manufacturing facility in Marlborough, MA under strict controls using proprietary processes. BCLK21-1/2"-9MM-A is RoHS3, REACH, and Conflict Minerals compliant.
PRODUCT SPECIFICATIONS
Dimensions
Bore (B1)
Larger inner diameter. Should match nominal shaft diameter.
0.5000 in
Small Bore (B2)
Smaller inner diameter. Should match nominal shaft diameter.
9 mm
Keyway (K1)
1/8 in
Keyway (K2)
3 mm
B1 Max Shaft Penetration
The maximum depth the shaft can penetrate into Bore B1.
0.935 in (23.7 mm)
B2 Max Shaft Penetration
The maximum depth the shaft can penetrate into Bore B2.
0.935 in (23.7 mm)
Outer Diameter (OD)
1.313 in (33.3 mm)
Bore Tolerance
Variance in finished bore range before installation.
+0.001 in / -0.000 in (+0.03 mm / -0.00 mm)
Length (L)
1.962 in (49.8 mm)
Length Tolerance
+/- 0.030 in (0.76 mm)
Hub Width (LH)
0.590 in (15.00 mm)
Recommended Shaft Tolerance
Acceptable variance in nominal shaft diameter before performance loss.
+0.0000 / -0.0005 " (+0.000 / -0.013 mm)
Key Width (K1)
0.1250 in
Key Width (K2)
3 mm
Key Height (K1)
0.1250 in
Key Height (K2)
3 mm
Keyway 1 Height (T1)
0.5596 in
Keyway 2 Height (T2)
10.4 mm
Keyway 1 Width Tolerance
+0.0020" / -0.0000"
Keyway 1 Height Tolerance
+0.0100" / -0.0000"
Keyway 2 Width Tolerance
+0.012 mm / -0.012 mm
Keyway 2 Height Tolerance
+0.1 mm / 0 mm
Fastening Hardware
Forged Clamp 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.
30 lb-in (3.40 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.
60 lb-in (6.80 Nm)
Parallel Misalignment
Shafts are parallel to each other, but not in-line with each other. They are offset.
0.012 in (0.30 mm)
Static Torque
Unidirectional constant max torque.
120 lb-in (13.6 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.
0.032 in (0.81 mm)
Torsional Stiffness
Measures the rigidity of the coupling. The more rigid the coupling, the less windup it will have.
300 lb-in/Deg (33,9 Nm/Deg)
Moment of Inertia
0.163474 lb-in2, 47.839 x10-6 kg-m2
Maximum Speed
10,000 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.
Hubs: 2024-T351 Aluminum Bar Bellows: Type 321 Stainless Steel
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...
Sulfuric Anodized MIL-A-8625 Type II, Class 2 and ASTM B580 Type B Black Anodize
Bellows Attachment Method
The method used to attach the bellows to the hubs.
Epoxy
Manufacturer
Ruland Manufacturing
Country of Origin
USA
Weight (lbs)
0.041358
Tariff Code
8483.60.8000
UNSPC
Code used to identify products to standardize nomenclature around the world.
31163018
Product Notes
Note 1
Stainless steel hubs are available upon request.
Note 2
Torque ratings are at maximum misalignment.
Note 3
Performance ratings are for guidance only. The user must determine suitability for a particular application.
Note 4
Torque ratings for the couplings are based on the physical limitations/failure point of the metal bellows. Under normal/typical conditions the hubs are capable of holding up to the rated torque of the metal bellows. 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 metal bellows. Keyways are available to provide additional torque capacity in the shaft/hub connection when required. Please consult technical support for more assistance.
