Mercury 225 Manual page 129

Part Number
10‑8M0033366
10‑67755‑003
10‑67755‑2
10‑8M0028080
10‑8M0032860
CHECKING BOAT TRANSOM CONSTRUCTION
IMPORTANT: Determine the strength of the boat transom. The
outboard mounting locknuts and bolts should be able to hold
75 Nm (55 lb‑ft) of torque without the boat transom yielding or
cracking. If the boat transom yields or cracks under this torque,
the construction of the transom may not be adequate. The boat
transom must be strengthened or the load carrying area
increased.
a - Transom yielding under bolt torque
b - Transom cracking under bolt torque
eng
OUTBOARD INSTALLATION
Available Outboard Mounting Bolts
Description
½‑20 x 5.00 in. long (3.25 in. thread)
½‑20 x 5.50 in. long (3.25 in. thread)
½‑20 x 6.50 in. long (2.75 in. thread)
½‑20 x 7.50 in. long (2.75 in. thread)
½‑20 x 8.00 in. long (2.75 in. thread)
a
117
b
18961