Martin ML090 1 Universal Series Jaw Coupling, Sintered Steel, Inch, 1" Bore A, 1" Bore B, 2.125" OD, 0.813" Length, 140 in-lbs Nominal Torque For use with Martin Universal (ML) series jaw style flexible coupling assemblies (sold separately) Steel sintered with powdered metals for strength, durability, and corrosion resistance Resistant to moisture, oil, grease, and contaminants such as dirt and sand Flexes up to 1 degree to compensate for angular misalignment of coupled shafts Operating temperatures range from -45 to 210 degrees F (-42 to 99 degrees C)