Hardin Marine

Turbosonic Leakproof Trim Caps

Lyall Tubrosonics, Inc. has designed and manufactured an internally baffled leak-proof cap for hydraulic drive lube reservoirs. This product was developed to solve the hydraulic drive lube fluid leaks into the bilge area. This two-piece design with an internal baffle prevents the hydraulic fluid from leaking out the vent. Replaces the stock caps. Available in standard blue, designer series polished look, red, chrome, black chrome and purple.

Fits MerCruiser, Mercury Kiekhaefer, Stern Drive Trim Pumps, and K-Planes Hydraulic Pump Reservoirs and Volvo, DP-S, DPX and SX Hydraulic Pump Reservoirs.

Product Advisory

Two Lever Xtreme Throttle/Shifter Control Customizer

The World's Finest Controls Are Now Stronger, Smoother And Have More Features Than Any Other Control Available

Hardin Marine offers the serious boater unsurpassed quality, performance and service.  The newly designed Hardin Marine Xtreme controls start with a main body quadrant CNC machined from lightweight durable aircraft billet aluminum.  while the handles are made of nothing short of nearly indestructible all billet stainless steel.  these controls feature larger smooth ergonomically designed throttle and shift knobs.  The throttle knobs allow for an industry exclusive 4 trim button option to ensure comfortable manageability boat control.  The Hardin controls offer an extremely narrow mounting footprint to allow easy mounting in the tightest of quarters but it does not stop there.  With the ability to change cable entry locations from front, rear, and even bottom entry these controls give you unlimited options.  If you can't decide between a detent (click) style operation or smooth, no problem, these controls offer both with a simple adjustment from the top side, there's no need to remove the controls to make the adjustment.  If your the type of customer that prefers "Great" over "Good" or "Exceptional" over "Acceptable" then we're confident you will own Hardin Marine Controls.

Shifter Features:

• Adjustable from DETENT (click) style or SMOOTH (friction) style...Outstanding for all applications
• Detent and friction can be adjusted without removing the unit
• Three different cable entry options front, rear, or bottom allow for precise mounting and setting of throttles
• Unique swivel style cable clamps accept standard 30 series cables
• Optional 0, 2, or 4 aircraft waterproof billet aluminum trim button options
• Available in a standard polished finish or optional UV protected powder coated colors
• No exposed mounting hardware

These NEW heavy-duty, durable, billet aluminum/stainless steel throttles are built for the race or pleasure boater.  Now with two or four trim buttons mounted in the throttle handle.  One set of buttons for trimming both drives or both tabs, single or dual configurations can be used to activate drives, tabs, nitrous, etc.  billet aircraft button style switches are waterproof with the wires running internally through the handle and brackets leaving no exposed wiring.

Available in Polished, Blue, Red, Black, Flat Black, Purple, Orange, White, Yellow and Lime Green. Contact us for custom color options. NOTE: These are built to order and take 4-5 business days to ship

Bravo Shift Cable Adjustment Guidance

2 Piece Polished Driveline Cover

This 2 piece cover bolts to the bellhousing and covers the short jet H-bar type driveline adding protection and a clean finished appearance. 7 inches long, 7-1/2 inch O.D. mounting flange, 5-1/2 inch O.D. Tube. 5 inch I.D. tube. The bolt center to center diagonally across the opening is 6-1/2"

2 Stage 1-1/4" NPT Dual Common Inlet / Outlet

This fitting is designed to assist in the plumbing of your engine when using the Hardin Marine Multi-Stage sea pumps. Anodized 6061T6 Billet Aluminum. Used on 625-4946 and 625-4926

Mayfair Electronics by Hardin Marine and Marine Design Corp have teamed up to bring the new generation of the Heads-Up indicator system to the marine industry. This new heads up indicator system does away with cables and converts digital electronic signals to operate actuators on the display. Carbon Fiber cover plates with powdercoated bezels in multiple colors. Indicators come standard with black sticks with engraved white writing. Optional LED lit clear lexan sticks with black writing are an available options.

Mayfair electronics by Hardin Marine brings the newest generation of the Heads-Up indicator system to the marine industry. Featuring Carbon Fiber cover plates with powdercoated bezels in multiple colors. Indicators come standard with black sticks with engraved white writing. The mechanical version uses the common 33c cable to operate the sticks for simple reliable operation.

Uflex Rack and Pinion Steering System Packaged in a Box

A convenient kit form, especially suitable as replacement steering, that includes helm, bezel and cable. The cable is available in 1-ft increments from 8 to 20 feet (specify cable length when ordering). The wheel is not included. Click here for how to measure for replacement cable.

This kit includes:

• M86 - pre assembled helm with steering cable
• G86 - shaft assembly
• X34 - 90° bezel (diameter is 5 1/8")

Features and Technical Specifications:

• All stainless steel cable output ends
• Made exclusively in corrosion resistant materials
• Optional 90° or 20° installation
• Standard 3/4”tapered shaft
• Lock-to-lock steering wheel turns: 3,5
• Stroke: 8.2” (210 mm)
• Maximum allowable steering wheel diameter: 16.5” (420 mm)
• Minimum steering cable bend radius: 7,9” (200 mm)
• G86 steering systems are not to be used on boats equipped with engines that exceed the maximum horsepower rating of the boat
• Exceeds EN 28848 safety standards
• Exceeds ABYC P17 safety standards

Uflex Rotary Steering System Packaged in a Box

A convenient kit form, especially suitable as replacement steering, that includes helm, bezel and cable. The cable is available in 1-ft increments from 8 to 20 feet (specify cable length when ordering). Featuring the T71FC helm with a Planetary Gear Design, the Rotech reduces steering effort and delivers more balanced loads on the steering wheel. This unique design also offers a wider wear area which reduces lost motion and improves durability. Centered on the main drive shaft, this helm requires less room behind the dash and is a direct “drop in” replacement for competing system; requiring no new holes for installation. The Rotech package also includes the M66 universal Rotary Steering Cable with stainless steel output fittings for maximum longevity and smooth steering. Click here for how to measure for replacement cable.

This kit includes:

• T71FC - helm
• X34 - 90° bezel (diameter is 5 1/8")
• M66 - steering cable

Features and Technical Specifications:

• Cable Entry can be set from either Port or Starboard sides
• Fast connect, simple installation
• All stainless steel cable output ends
• Corrosion resistant materials
• Particularly suitable where clearance is limited
• Optional 90° or 20° installation
• Standard 3/4” tapered shaft
• Lock-to-lock steering wheel turns: approx. 3,8
• Stroke: 9” (228 mm)
• Maximum allowable steering wheel diameter: 16” (406 mm)
• Minimum steering cable bend radius: 7.9” (200 mm)
• Minimal feedback
• Compact for mounting
• T71FC steering systems are not to be used on boats equipped with engines that exceed the maximum horsepower rating of the boat.
• For boats faster than 50 mph the twin cable steering system T72FC is recommended
• Exceeds EN 28848 safety standards
• Exceeds ABYC P17 safety standards

UFLEX Style Aluminum Steering Bezel (LIMITED COLORS AVAILABLE)

If you've ever wondered what to do about that cheap plastic steering bezel that cracks and fades on your Morse steering post or you just want the perfect color matched accessories to go with your new steering wheel and adapters, this is it.  These aluminum steering bezels are a direct replacement for the stock plastic bezel and are available polished or in your choice of colors.  These units fit rack and pinion steering helms only.

See what each of our powder-coated finishes (both flat and glossy) look like under different lighting here!

NOTE: THE INSTALLATION OF THIS BEZEL MAY REQUIRE YOUR SHAFT ADAPTER BE MODIFIED FOR THE BEZEL TO FIT PROPERLY.

1310 Spicer Bolt Pattern To Jet Pump Spline

• Overall length: 7-1/2"
• Spline Shaft: 1-3/8"
• Flange Mount: 2" x 2-3/8"
• Spline length is 2" inside coupler
• Uses 3/8-24 bolts

This unit bolts to the PTO flange. This is the most standard u-joint assembly found in production style boats.
Note: The overall length does not include the PTO flange which is and additional one inch thick.

Need help choosing your new driveshaft? Check out this handy tutorial!

Sold Each, these bolts are used on older style U-Joint Driveline assemblies that bolt directly to the flywheel without using a PTO adapter.

Universal Dipstick Kit

Efficient twist-lock design eliminates oil leakage, blowing out of handle and keeps crankcase gases from escaping. In Dyno testing, engines equipped with this Moroso twist lock dipstick pulled more vacuum than engines with a standard, non-locking dipstick.

Features:
• Efficient twist-lock design
• High temperature nylon handle dissipates heat for checking oil level on hot engines
• Flexible stick with zinc-plated bendable outer tube
• Adjustable mount tab can be modified as needed
• 1/4" NPT steel weld-in fitting supplied for pans not already equipped
• Existing "Full" and "Fill" marks can be used or new marks can be added
• Overall length including exposed portion of dipstick is 24"

• All plastic construction
• Only for 1/8" pitot hose
• Not recommended for high performance applications 
• Tested up to 80MPH
• Triangular bolt pattern, top bolts are 1-1/4" above bottom bolt.

• All plastic construction, "tested" to 80 MPH
• Designed to accept 1/8" pitot hose ONLY. (Included)
• Not recommended for high performance applications

Universal Engine Harness for use in multiple engine applications. The wires are 6' long and do not have any terminals on the engine ends.

Note: Uses 14 AWG wire

Universal Engine Harness w/ Solenoid Kit for use in multiple engine applications. The wires are 6' long and do not have any terminals on the engine ends.

Note: Uses 14 AWG wire

Universal Mercury Plug Harness 20 FT (Male Plug)

This plug is for use when building a boat harness. They are designed to plug into a Mercury engine harness. This is a perfect start for the handy do-it-yourselfer. This universal style harness will provide connections for power, ignition and sender wires for the engine. Additional wiring is required to complete a factory style harness.

Note: Uses 16 AWG wires, red and black wires are 10 AWG.

• Universal Chrome Coil Bracket.
• Easy mounting of most original and aftermarket coils.
• Secure & attractive mount in any boat.

Upper Port Side Power Steering Mounting Bracket Assembly - BBC Head Mount

This power steering mounting bracket is designed for a upper port side mount on big block Chevrolet engines.  This heavy duty aluminum bracket is anodized black for corrosion protection (Note: picture shows satin finish).  This bracket accepts most popular GM power steering pumps and is supplied with the necessary mounting hardware.

NOTE: As of 2026 these now are the same bracket as the 625-8108 which includes a cut out for the Hardin Marine Closed Cooling tank bracket. The 625-8109 kit includes extra spacers to stand the bracket off the cylinder head, but is otherwise the same as the 625-8108 kit.

Upper Port Side Power Steering Mounting Bracket Assembly - BBC Head Mount for Hardin Closed Cooling

This power steering mounting bracket is designed for a upper port side mount on big block Chevrolet engines.  This heavy duty aluminum bracket is anodized black for corrosion protection (Note: picture shows satin finish).  This bracket accepts most popular GM power steering pumps and is supplied with the necessary mounting hardware.

Upper Starboard Side Power Steering Mounting Bracket Assembly - Fits B/B Chevrolet

This power steering mounting bracket is designed for a upper starboard side mount on big block Chevrolet engines.  This heavy duty steel bracket is powder coated black for corrosion protection.  This bracket accepts most popular GM power steering pumps and is supplied with the necessary mounting hardware.

Valve Cover Breather Vent -20 AN for KE 2 Piece Valve Covers

Here you will find the components used in the popular Keith Eickert2-piece valve covers. These are polished Stainless Steel.  Both seal with an o-ring. 1" NPT internal thread and fits 1-1/2" Breathers

Double Seal Prop Shaft Stuffing Box (For 1" or 1-1/8" Shafts Only)

Machined from Billet Aluminum, this stuffing box incorporates double neoprene seals. Water may be discharged into the stuffing box, further lubricating the aqua lube bearing insert.  For 1"  or 1-1/8" shafts only. 1/8" NPT water discharge port .

Vertical Low Head Mount HP4 Filter Head Bracket for Big Block Chevrolet - Black

This is the perfect vertical mount solution that the industry has been looking for now for years. A bracket that clears Standard Bravo exhaust tail pipes yet keeps the filter easily accessible from the rear side of the engine. A Stainless Steel oil filter head can be mounted conveniently in a vertical upward layout or vertical downward configuration. The 6061-T6 billet aluminum bracket also features a engine lifting ring located for service needs.The bracket can be mounted on the front or rear of the engine to the factory cylinder head mounting holes(3/8") and is supplied with aluminum and stainless steel mounting hardware. The filter head accept popular GM oil filters HP4 or Moroso #2246