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This Boston Gear SCC1/2X1/2 shaft coupling is a clamp type with 4 screws for connecting two rotating shafts and providing low backlash. It is made of low carbon steel for strength and durability and has a black oxide finish for resistance to corrosion. It is an all-metal coupling, so no lubrication or maintenance is required. This shaft coupling has a .5" bore on both sides for attaching shafts of the same size and is suitable for use with pumps and compressors, machine tools, and gear boxes, among others.Mounted bearings combine a bearing mounted inside a housing unit. The bearing housing replaces the need for a casting or weldment to position the bearing securely for reliable operation, and its design determines the type of insert bearing. Insert bearings use rolling elements (ball, cylindrical, spherical, barrel, needle, spindled, or tapered) to maintain the separation between moving parts to reduce rotational friction, and to support radial and axial loads. Available in a variety of materials and mounting configurations, mounted bearings can be one- or two-piece, they can have an extended inner ring and locking device, and they can have seals and end caps that retain lubrication and protect the working parts of the bearing from environmental debris. Mounted bearings support shafts in a variety of mounting configurations (flange block, hanger, pillow block, and take-up block), and are used in a range of applications from light duty shaft guidance on conveyors to road building equipment and crushers.Boston Gear manufactures gears, gear drives, bearings, valves, shaft collars, couplings, and other power and fluid transmission components. The company, founded in 1877, is headquartered in Charlotte, NC, and meets International Organization for Standardization (ISO) standard 9001:2008 standard.