Boston Gear FC20-3 4 Flexible Shaft Couplings

The Boston Gear FC20-3/4 is a FC20-series 3-jaw jaw coupling half engineered for robust, misalignment-tolerant shaft connections in light-to-moderate power transmission. This 3/4 in bore, 2 in outside diameter coupling half measures 3-11/16 in overall length and is built from alloy steel, per Boston Gear's FC series specification, with a bore tolerance of +0.001/-0.000 in and a straight jaw profile designed for straightforward alignment. The bore is round with a fixed set-screw shaft locking arrangement and accepts a 3/32 in by 3/16 in keyway to secure the shaft, with hub diameter sized at 1-3/4 in. This FC20 half is part of Boston Gear's FC20 family, reflecting the company's emphasis on solid alloy-steel construction for reliable torque transfer in machinery and drive systems that rely on a simple, durable coupling to connect shafts.