HF42IFHD HnF SKU Port (inch) A (inch) Hex (inch) HF42IFHD-02-02 1/8 0.59 0.40 HF42IFHD-03-03 3/16 0.62 0.47 HF42IFHD-04-04 1/4 0.62 0.50 HF42IFHD-05-05 5/16 0.70 0.56 HF42IFHD-06-06 3/8 0.80 0.75 HF42IFHD-08-08 1/2 0.91 0.90 SAE 040101