5200, but make sure the hole is dry first.. and I mean DRY!!!... as in leave the bolt out and hit the area with warm from a heater for a day or so dry. The wood in your transom does not like wet. Wet causes dry rot, which is the number 1 reason transoms rot out. Coat the bolt and the hole completely including the inside of the hole, then assemble.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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