These round-headed bolts fasten the pump faceplate to the wet end. They are used on almost all Waterway and Aqua Flo pumps. Don't lose them if you want to open up your pump wet end, because it only takes one missing bolt to cause a leak. Most pumps use 8 of these bolts and so we sell them in sets of 8.
These are size #8 bolts, with a 32 turns per inch thread, so a 8-32 type.
Diameter : 4.06 mm (American size 8, 5/32")
Thread density : 32 turns per inch = 10 turns every 7.9 mm
Length : 15 mm, excluding the bolt head