... 1.Specification: 19-W-4, 15-W-2, 30/100, 40/50, 60/100 2.Materia : ASTM A36,A1011,A569,Q235 ... , 15, 20, 23.85, 25, 30, 30.16, 30.3, 34.3, 35, 40,41,60mm. US standard: 1"x3/16", 1 1 ... /4", 1 1/2"x 1/4" etc.3. Cross bar pitch : 40,45,50,76,100,101.6mm etc4. Materia : ASTM ...