9/32″-32 threaded. Fits all tappets that take 9/32-32 threaded adjusting screws. Replaces OEM 18570-38. Note: For matching adjusting screws see JIMS 517749 for 15-73 Flatheads, JIMS 517748/Import 517740 for 57-85 XL, JIMS 517747/S&S 531332/Import 517745 for 36-52 Pan & Knuckle, JIMS 517746 for 36-52 Pan & Knuckle specials with top end lubrication through the pushrods, Import 556634 for 53-84 Pan, Shovel.
