Thread rods are used for hanging the strut channels etc

1/4"-20 x 10'E.G.White

3/8" - 16 x 10' E.G White

1/2"-13 x 10'E.G White

5/8" - 11 x 10' E.G White

3/4"-10 x 10'E.G White

7/8"-9 x 10' E.G White

Or  M6X3000mm/M8X3000mm/M10X3000mm/M12X3000mm in Metric Sizes