Description
Overview:
Boat Trailer Stem Post 34mm x 300mm, Zinc-Plated, For Side Rollers (MPN TR477) is a robust steel tube post used to mount and position side rollers on boat trailer channel and clamp brackets. The post has a 34 mm outside diameter (approx. 1.34 in), a 300 mm overall length (approx. 11.81 in), and a 2.5 mm wall thickness (approx. 0.10 in). Finished in clear zinc plating, it offers durable corrosion resistance suited to marine and road use. The stem is pre‐drilled to accept an M8 fixing bolt commonly supplied with compatible side roller brackets, allowing secure attachment of the roller arm or bracket. Designed to be clamped into position using bracket clamps such as Maypole MP222 and MP223, this post provides a stable, adjustable mounting for guiding and supporting the hull during launching, recovery and transport on a wide range of small to medium boat trailers.
Key Features:
- 34 mm outside diameter steel tube (approx. 1.34 in)
- 300 mm length (approx. 11.81 in) for versatile roller positioning
- 2.5 mm wall thickness (approx. 0.10 in) for strength and rigidity
- Clear zinc-plated finish for corrosion resistance in marine environments
- Pre-drilled for M8 fixing bolt used with side roller brackets
- Suited to side roller and channel bracket assemblies on boat trailers
- Designed to clamp into compatible brackets, including MP222 and MP223
- Smooth tube finish to allow accurate clamp adjustment and alignment
- Trade-standard dimensions to integrate with common side roller hardware
- Single-piece construction for reliability under trailer vibration and load
Typical Applications:
Used as the vertical or horizontal stem in side roller and channel bracket assemblies on boat trailers to guide and support the hull during loading and unloading. Clamps into place using compatible bracket clamps, including Maypole MP222 and MP223. Suitable for trailer maintenance, refurbishment or new builds where a 34 mm OD, zinc-plated stem is required for side roller setups.
Also known as:
34 x 300 mm Roller Stem
34 mm Side Roller Post
Boat Trailer Channel Bracket Stem
Side Roller Spindle Tube
Maypole part number MP477
Product Specifications
| L&S Part No. | TR477 |
|---|---|
| Manufacturer | Maypole |
| OEM No. | MP477 |
| Unit of Sale | 1 |



