1.5 in C Size Ball Aluminum Fish Finder Mount with 18.3 in Arm

In this review of the 1.5 in C size ball aluminum fish finder mount, the bottom line is simple: anglers and boaters who need a long, corrosion-resistant arm and near-infinite adjustability will find strong value here. The mount is built from powder-coated marine-grade aluminum and corrosion-resistant composites, and that construction is the single biggest reason to buy for anyone mounting a fishfinder or chartplotter up to about 9 in. The included 18.3 in double-socket arm and robust AMPS base make installation versatile, and customers will appreciate the secure hold and easy angle adjustments once installed.

Key Features

• Extra-long double arm: The 18.3 in C size arm replaces multiple connectors to provide reach without sacrificing rigidity when positioned correctly.
• Marine-grade construction: Powder-coated aluminum and corrosion-resistant composite materials give lasting strength in saltwater environments.
• Salt spray tested hardware: Stainless steel bolts and springs plus a cast single-piece aluminum body resist high salt corrosion for thousands of hours.
• Wide compatibility: The rectangle plate and AMPS hole pattern match many GPS and fishfinder units from major manufacturers and standard mounting systems.
• Two ball joints: Dual ball and socket adjustments offer near-infinite tilt and rotation options for optimal viewing angles and 360 rotation.
• Comprehensive fasteners: Supplies include four sets of 316 marine grade stainless steel machine screws, lock nuts and sheet metal screws for a secure install.

Who It's For

This mount is geared toward recreational and semi-pro anglers who use medium to large chartplotters and fishfinders up to around 9 in and who need a long reach arm that still locks solidly in place. It is an excellent fit for boaters mounting units on consoles, kayaks with flat surfaces, and anyone who wants the flexibility of ball and socket adjustment without joining multiple short mounts.

Those who should look elsewhere include users with very large screens over 9 in or setups requiring fine vibration isolation; the manufacturer notes best results with displays up to 9 in, and heavier chartplotters may need a shorter or beefier support system for maximum stability in rough seas.

Pros & Cons

Pros

• Sturdy powder-coated aluminum construction gives confidence in saltwater conditions and holds units securely.
• Long 18.3 in arm reduces the need for stacked connectors while keeping usable adjustability.
• Includes marine grade fasteners and an AMPS base for straightforward installation on flat surfaces.
• Dual ball joints and 360 rotation allow precise screen positioning and easy reorientation while underway.

Cons

• Recommended for screens up to 9 in, so very large displays may not be fully supported.
• The long arm increases leverage, so careful mounting and torqueing of fasteners is required to avoid movement on rough water.

Specifications

Arm length	18.3 in double socket arm (C size)
Ball size	1.5 in / C size / 38 mm
Base pattern	2.4 in diameter AMPS hole pattern
Mounting plate	6.23 in x 2 in universal rectangle plate with multiple pre-drilled holes
Materials	Powder-coated marine-grade aluminum and corrosion-resistant composite
Hardware	4 sets of 316 marine grade stainless steel machine screws, lock nuts and sheet metal screws
Rotation	360 rotation with two ball joint adjustments

Our Verdict

The 1.5 in C size aluminum fish finder mount is a practical, well-built option for boaters who need reach, corrosion resistance, and flexible positioning. It offers solid value for anyone mounting fishfinders or chartplotters up to 9 in, with rugged hardware and a thoughtful AMPS-compatible plate. Choose this if you want a durable long-arm mount that holds securely and adjusts easily; opt for a shorter or heavier-duty system only if you use much larger displays or expect extreme wave impact.

Frequently Asked Questions

Will this fit my chartplotter?
Check that your display uses AMPS or matches one of the pre-drilled rectangle plate hole patterns; the mount is designed for many Garmin, Lowrance and Humminbird units up to about 9 in.

Is the mount saltwater resistant?
Yes, it is cast in one piece of powder-coated marine-grade aluminum with stainless hardware and has been salt spray tested for extended corrosion resistance.

Can it rotate fully while installed?
Yes, the dual ball joints and 360 rotation allow comprehensive tilt and swivel adjustment once securely mounted.