Transom Plates

P&M Plastics fabricates custom plastic transom plates for outboard motor mounting on tinnies, fibreglass boats, and commercial vessels. A transom plate distributes the concentrated load and vibration of an outboard engine across the transom, preventing cracking, deformation, and stress fractures over time. Our transom plates are CNC-cut from HDPE, nylon, and UHMWPE, marine-grade materials that won't corrode, absorb water, or react with stainless steel fasteners. Every plate is cut to your measurements at our Gold Coast fabrication workshop, with bolt hole patterns, radiused corners, and countersunk fastener holes machined in-house. We supply single replacement plates for weekend boaters through to batch runs for boat builders and marine workshops.

Why Plastic Transom Plates

Plastic transom plates (HDPE, nylon, UHMWPE) are the standard choice for most outboard setups. They're lightweight, absorb engine vibration effectively, won't corrode in salt water, and create no galvanic reaction with stainless steel bolts. They're ideal for tinnies and fibreglass boats running outboards up to around 150 HP.

Why Transom Plates Matter

Without a transom plate, the outboard mounting bolts concentrate all engine load, thrust, and vibration into a small area of the transom. Over time this causes the fibreglass or timber core to crush, crack, or delaminate. A properly sized transom plate spreads that load across the full mounting area, extending the life of the transom and reducing hull vibration. It also makes remounting or upgrading engines far simpler — just re-drill the plate rather than patching the transom.