Our 4130 alloy threaded tube ends have been the choice of the nations top chassis builders for years. the strength, consistency and finished quality are unmatched. They are offered in a wide variety of tube diameter, wall thickness and thread combinations. Features. Slip diameter to fit 1.250 diameter tube with .065 wall thickness. 3/416 left hand thread. Raw machined finish ready to weldSpecifications. Finish Natural. Material Steel. Thread 3/416. Size 1.25 x 0.06 in.