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    The Beam flexible coupling is formed from one piece of aluminum rod. A spiral slot is cut through the length of the aluminum tube forming a “spring” center section referred to as a helical coil or beam. The flexure allowed by the beam portion of the coupling is capable of accommodating angular, parallel and axial misalignment while continuing to convey power between the attached shafts. This results in a single piece, true flexible coupling.

    The Miniature Beam coupling is designed for very light power transmission applications where accurate positioning of shafts is an essential requirement. It also has a very high tolerance to heat, chemicals, and corrosion that would be harmful to conventional elastomeric flexible couplings.

    The Miniature Beam coupling design is very well suited for small shaft applications and the inherent requirements of start/stop/reverse applications where zero backlash and extreme positioning accuracy are important. This coupling operates either clockwise or counter clockwise without sacrificing windup or torque capabilities.
Unit of Measure



N/A ES112 BEAM 3/8X1/2

Coupling Size

N/A ES112


N/A Single Beam Coupling


N/A Anodized Aluminum


N/A Set Screw


N/A Anodized Aluminum


N/A 0.09 oz

Weight (Complete Coupling w/ Min. Bores)

N/A 1.40 oz

Dimensional Data

Bore A

N/A 0.375 in

Bore B

N/A 0.500 in

Overall Length

N/A 1.102 in28.00 mm

Keyway Size

N/A No Keyway

Outside Diameter

N/A 1.102 in28.00 mm

Min. Bore (Dimensions ID1/ID2)

N/A 0.315 in8.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 0.472 in12.00 mm

Length thru Bore

N/A 0.276 in7.00 mm

Set Screw Size

N/A 1/4-20

Cubic inches

N/A 1.33827 in³

Performance Data

Max. Operating Temperature

N/A 200.00 ºF

Max. Speed

N/A 10000 rpm

Nominal Torque

N/A 17.00 in·lb

Max. Angular Misalignment

N/A 5.00 º

Axial Misalignment

N/A ± 0.010 in

Parallel Misalignment

N/A 0.005 in

Moment of Inertia

N/A 148.9900 lb·in²

Torsional Stiffness

N/A 409.30 in·lb/rad
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