SIERRA SIE18-3728 Jam Nut for Boat Transom Plate, Mercury 11-99298 / 11-863332 Replacement, Flat Marine Outboard Fastener
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SIERRA

SIERRA SIE18-3728 Jam Nut for Boat Transom Plate, Mercury 11-99298 / 11-863332 Replacement, Flat Marine Outboard Fastener

Product Code: SIE18-3728

The SIERRA SIE18-3728 Jam Nut is a flat marine fastener designed for boat transom plates. It offers a secure and reliable solution for mounting or reinforcing outboard motors, jack plates, or during transom repairs.

This jam nut is a direct replacement for Mercury part numbers 11-99298 and 11-863332, making it an ideal fit for Mercury-compatible engines. Suitable for both professional marine mechanics and boat owners, it helps distribute load and reduces stress on the transom plate.

  • Flat design for even load distribution and transom reinforcement
  • Replaces Mercury 11-99298 and 11-863332 for easy compatibility
  • Durable SIERRA construction for long-lasting marine use
  • Fits boat transom plates during outboard motor or jack plate installation
  • Essential for repairs, upgrades, or maintenance on Mercury-compatible boats