HF252IFHD HnF SKU Port (inch) A (inch) B (inch) HF252IFHD-03-03-02 3/16-3/16-1/8 0.39 0.55 HF252IFHD-05-05-02 5/16-5/16-1/8 0.45 0.63 HF252IFHD-06-06-04 3/8-3/8-1/4 0.56 0.74 SAE 040427