Ruland MBC51-20-12-A Bellows Clamp Coupling 20 mm x 12 mm Bores

DIMENSIONS
Bore (B1)	20 mm	Small Bore (B2)	12 mm
B1 Max Shaft Penetration	27.9 mm	B2 Max Shaft Penetration	27.9 mm
Outer Diameter (OD)	50.8 mm	Bore Tolerance	+0.03 mm / -0.00 mm
Length (L)	61.3 mm	Length Tolerance	+/- 0.76 mm
Hub Width (LH)	20.55 mm	Recommended Shaft Tolerance	+0.000 mm / -0.013 mm
FASTENING HARDWARE
Forged Clamp Screw	M5	Screw Material	Alloy Steel
Hex Wrench Size	4.0 mm	Screw Finish	Black Oxide
Seating Torque	9.5 Nm	Number of Screws	2 ea
PEFORMANCE SPECIFICATIONS
Dynamic Torque Reversing	11.30 Nm	Angular Misalignment	2.0°
Dynamic Torque Non-Reversing	22.60 Nm	Parallel Misalignment	0.25 mm
Static Torque	45.2 Nm	Axial Motion	0.50 mm
Torsional Stiffness	108 Nm/Deg	Moment of Inertia	81.191 x10-6 kg-m2
Maximum Speed	10,000 RPM	Full Bearing Support Required?	Yes
Zero-Backlash?	Yes	Balanced Design	Yes
RECOMMENDED INSTALLATION TOOLS
Torque Wrench	TW:BT-4C-3/8-86	Recommended Hex Key	Metric Hex Keys
ADDITIONAL INFORMATION
Material Specification	Hubs: 2024-T351 Aluminum Bar Bellows: Type 321 Stainless Steel	Temperature	-40°F to 200°F (-40°C to 93°C)
Finish Specification	Sulfuric Anodized MIL-A-8625 Type II, Class 2 and ASTM B580 Type B Black Anodize	Bellows Attachment Method	Epoxy
Manufacturer	Ruland Manufacturing	Country of Origin	USA
Weight (lbs)	0.476500	UPC	634529064351
Tariff Code	8483.60.8000	UNSPC	31163018

 

Ruland MBC51-20-12-A Bellows Clamp Coupling 20 mm x 12 mm Bores

Ruland bellows couplings are zero-backlash, torsionally stiff, and have a balanced design.

They are made from black anodized aluminum hubs and stainless steel bellows to offer superior performance in precision servo applications.

The stainless steel bellows are ideal for transmitting torque due to their thin walls allowing the coupling to easily flex while remaining rigid under torsional loads.

Bellows couplings can accommodate all forms of misalignment – angular, parallel, and axial motion.

Combining aluminum hubs with stainless steel bellows results in a lightweight, low inertia coupling that is well suited for precision applications found in a variety of industries including semiconductor, solar, printing, packaging, and machine tools.

Bellows couplings have no moving parts ensuring a long maintenance-free life. Ruland uses a balanced design to reduce vibration in high RPM applications of up to 10,000 PRM.

Ruland bellows couplings are carefully made from select bar stock sourced exclusively from North American mills and are machined to a fine burr-free finish. Hardware tests beyond DIN 912 12.9 standards for maximum torqueing capabilities.

Ruland, founded in 1937, manufactures all products in our Marlborough, MA USA factory under strict controls using proprietary processes.

Bellows couplings are RoHS2 and REACH compliant.

Ruland MBC51-20-12-A Bellows Clamp Coupling 20 mm x 12 mm Bores

Asin	B016APPOSQ