Recommended stair tread widthsT1,T2,T3,T4,T5,T695125155185215245275Bearing bars at 30mm pitchT1,T2,T5,T6125165205245285Bearing bars at 40mm pitchT3,T4115155195235275Bearing bars at 40mm pitchFixing hole centers4575100150Max stair tread lengthsBearing bar section25×325×532×5Steel...