... a mechanical overload protection device. When the equipment failure, shear pin will cut, then can prevent the equipment work overload and ... /8'', 1 1/4''x1/8'', 1 1/2''x1/8'' etc 2 Bearing Bar Pitch 12.5, 15, 20, 23.85, 25 ... -w-4, 11-w-4, 19-w-2, 15-w-2 etc. 3 Twisted Cross Bar Pitch 38.1, 50, 60, 76, 80 ... , 100, 101.6, 120mm, 2'' & 4'' etc 4 Material Grade ...