Merc Threads & Sizes

BluFin · 07-04-2006, 11:21 PM

Been a few questions now & in the past on bolts nuts & threads
I have dug out this old chart from an old Merc service manual, mostly because this one is on 3 pages rather than being spread througout the whole manual. and covers a larger HP range
Models may have changed but the threads are still the same in pretty much all locations mentioned.

first is the size - then the TPI (Threads Per Inch) Downloadable PDF from URL

http://www.hedges-uk.com/boat/Merc%20Threads.pdf

BluFin · 08-04-2006, 07:56 AM

Sorry should have added they are all UNC or UNF (BSF, BSC to us)

divertom · 08-04-2006, 09:30 AM

useful

BluFin · 28-04-2006, 12:51 PM

A breakdown of Types

Refer to numbers on the PDF List for X ref ( handwritten on the LH side of page)

UNF
1, 14, 19, 27, 29, 31, 33, 42, 45, 47, 48, 49, 54

UNC
2, 3, 4, 5, 6, 7, 10, 11, 12, 15, 16, 17, 18, 23, 25, 34, 39, 40, 41, 43, 44, 46, 50, 51, 52, 53, 55

Plug is a 14 MM