Hardin Marine

5/16-18 SS Nut
Your Price:
$1.25

5/16-18 SS Nut

90031CP-FNSS

SS 5/16-18 Nut for Hardin or Mercruiser Gen 5/6 Sea Pumps

13 Plate Remote Cooler Assembly
Your Price:
$819.99

Bravo Cooler Housing with 13 Plate Cooler Kit

625-8055

13 Plate Remote Cooler Assembly

This multi plate design oil cooler assembly is used in virtually every severe duty type of oil cooling environment found today. Recognized by Mercury Racing and every high profile professional engine builder as the most effective method to control oil temperature. The 8, 13, and plate oil cooler design offers maximum heat dissipation in the most compact size and use of space. This is basically the same cooler package that's incorporated into a dual cooler style of race bellhousing. Now you can have the same great cooling features in a remote mountable unit. The cast aluminum housing features a hard anodized finish for corrosion resistance. Each housing has 1" NPT water inlets/outlets and a dual bolt mounting flange and will accept a 8, or 13 plate cooler assembly when used with the appropriate cover assembly.

Length 11-3/4", Height 5", and depth based on the 13 plate configuration is 5-3/4".


Hardin Billet Aluminum Flywheel - Internal Balance for GM LS1-LS7 (Bottom Mount Starter)
Your Price:
$479.99

Hardin Billet Aluminum Flywheel - Internal Balance for GM LS1-LS7 (Bottom Mount Starter)

755-8644

Hardin Billet Aluminum Flywheel Internal Balance for GM (LS1-LS7)

Ring Gear Tooth Quantity:168-tooth, Rear Main Seal Style:1-piece, Flywheel Material:Aluminum

These precision billet aluminum flywheels deliver all of the strength and reliability that you desire with the light weight and advantages that only aluminum can provide. Lightweight Aluminum alloy flywheels can offer substantial benefits for certain situations such as light weight boats or racing boats that need rapid engine rpms instantaneously. These are recommended as replacements for factory-cast flywheels in high performance and racing applications. They're better for acceleration of heavier race boats. All Hardin flywheels are CNC-machined from certified materials.

  • Accepts Mercury HP couplers and heavy duty drive plates
  • Multi-point ring gear attachment
  • Light weight yet durable
  • Zero/neutral balance • 168 tooth gear
  • Bottom Mount Starter Flywheel
  • Weight: 12 lbs

Hardin Marine Classic Offshore Group 27 Battery Box Step Top
Your Price:
$89.99

Hardin Marine Classic Offshore Group 27 Battery Box Step Top

420-913033

Hardin Marine Classic Offshore Group 27 Battery Box Step Top

Add a heavy duty and stylish step top to your battery box! Fits 420-913027 battery box.


Mayfair 2 Slot LED Trim Indicators

Starting From:
$1,999.99
This Part has options, please click the button below to order.

LED Trim Indicator Kit for Dual Mercury #6 Outdrives

137-8729 + Option(s)

  • LED Lighted Indicator System by Mayfair for Use with Dual Mercury #6 Outdrives.
  • Lights Run through Red, Green and Blue from Top to Bottom.
  • Available with Carbon Fiber faces in Black, Silver, Blue, Red and Purple
  • Polished Stainless Steel or Powder-Coated Billet Aluminum Rims.
  • Easy to Install and Simple Wiring. No Cables Required.
  • 5" Length x 2-1/2" Width Panel
  • Complete Kit - Includes Panel, Harness, and Electronic Sensor Actuators.


Mayfair 2 Slot LED Trim Indicators

Starting From:
$995.99
This Part has options, please click the button below to order.

LED Trim Indicator Kit for Single Imco SCX Outdrive

137-8752 + Option(s)

  • LED Lighted Indicator System by Mayfair for Use with Single Imco SCX Drive
  • Single Drive Setup Lights Up Both Sides Evenly for Single Drive Display.
  • Lights Run through Red, Green and Blue from Top to Bottom.
  • Available with Carbon Fiber faces in Black, Silver, Blue, Red
  • Polished Stainless Steel or Powder-Coated Billet Aluminum Rims.
  • Easy to Install and Simple Wiring. No Cables Required.
  • Includes: (2) Wiring Harnesses
  • 5" Length x 2-1/2" Width Panel
  • Complete Kit - Includes Panel, Harness, and Electronic Sensor Actuators.


Mayfair 2 Slot LED Trim Indicators

Starting From:
$899.99
This Part has options, please click the button below to order.

LED Trim Indicator Kit for Single Mercury Bravo Outdrive

137-8721 + Option(s)

  • LED Lighted Indicator System by Mayfair for Use with Single Mercury Bravo Drive
  • Single Drive Setup Lights Up Both Sides Evenly for Single Drive Display.
  • Lights Run through Red, Green and Blue from Top to Bottom.
  • Available with Carbon Fiber faces in Black, Silver, Blue, Red
  • Polished Stainless Steel or Powder-Coated Billet Aluminum Rims.
  • Easy to Install and Simple Wiring. No Cables Required.
  • Includes: (2) Wiring Harnesses
  • 5" Length x 2-1/2" Width Panel
  • Complete Kit - Includes Panel, Harness, and Electronic Sensor Actuators.


Mayfair 2 Slot LED Trim Indicators

Starting From:
$1,299.99
This Part has options, please click the button below to order.

LED Trim Indicator Kit for Single Mercury Speedmaster, Alpha or TRS Outdrive

137-8720 + Option(s)

  • LED Lighted Indicator System by Mayfair for Use with Single Mercury Speedmaster / TRS / Alpha Drive
  • Single Drive Setup Lights Up Both Sides Evenly for Single Drive Display.
  • Lights Run through Red, Green and Blue from Top to Bottom.
  • Available with Carbon Fiber faces in Black, Silver, Blue, Red
  • Polished Stainless Steel or Powder-Coated Billet Aluminum Rims.
  • Easy to Install and Simple Wiring. No Cables Required.
  • Includes: (2) Wiring Harnesses
  • 5" Length x 2-1/2" Width Panel
  • Complete Kit - Includes Panel, Harness, and Electronic Sensor Actuators.


2 Stage Stainless Rear Cap / Bearing Upgrade
Your Price:
$259.99

1 Stage Generation 2 Front Pump Housing with Shaft, Bearings and Seals

625-4225

1 Stage Generation 2 Front Pump Housing with Shaft, Bearings and Seals

2 Stage Stainless Rear Cap / Bearing Upgrade
Your Price:
$295.99

1 Stage Stainless Rear Cap / Bearing Upgrade

625-4162

1 Stage Stainless Rear Cap / Bearing Upgrade

The latest in multi-stage pump design has again advanced. All current series Hardin multi stage sea pumps now feature this roller bearing tail shaft design. If you have an earlier bushing styled tail shaft pump it can now easily be upgrades to the later version with one of our kits. This kit includes a new pump shaft, bearing, seal, and new stainless steel rear cover plate.

1 Stage Stainless Steel Sea Pump
Your Price:
$619.99

1 Stage Stainless Steel Sea Pump

625-4910

1 Stage Stainless Steel Sea Pump

  • Base Pump with no inlets and outlets
  • Pump churns out up to 20% more water than a stock factory pump.

The Extreme single stage pump is the perfect choice for a stock or slightly modified engine. It is designed with large 1” NPT inlet and outlet flanges that deliver the flow of water more efficiently than a stock single impeller OEM pump. By allowing direct inlet water flow these pumps churn out up to 20% more water than a stock factory pump. These pumps are fully rebuildable and will be the last pump you ever buy!


1 Stage Stainless Steel Sea Pump with 1 Groove Pulley & Single 1” NPT Inlet/Outlet
Your Price:
$769.99

1 Stage Stainless Steel Sea Pump with 1 Groove Pulley & Single 1" NPT Inlet/Outlet

625-4911

1 Stage Stainless Steel Sea Pump with 1 Groove Pulley & Single 1” NPT Inlet/Outlet

  • 1” NPT inlet and outlet
  • Pump churns out up to 20% more water than a stock factory pump.

The Extreme single stage pump is the perfect choice for a stock or slightly modified engine. It is designed with large 1” NPT inlet and outlet flanges that deliver the flow of water more efficiently than a stock single impeller OEM pump. By allowing direct inlet water flow these pumps churn out up to 20% more water than a stock factory pump. These pumps are fully rebuildable and will be the last pump you ever buy!

Available in: Aluminum for fresh water use or Stainless Steel for use in salt water with 1” NPT inlet/outlet and optional 1-1/4” custom billet hose barbs.


1 Stage Stainless Steel Sea Pump with 2 Groove Pulley & Single 1” NPT Inlet/Outlet
Your Price:
$789.99

1 Stage Stainless Steel Sea Pump with 2 Groove Pulley & Single 1" NPT Inlet/Outlet

625-4912

1 Stage Stainless Steel Sea Pump with 2 Groove Pulley & Single 1” NPT Inlet/Outlet

  • 1” NPT inlet and outlet
  • Pump churns out up to 20% more water than a stock factory pump.

The Extreme single stage pump is the perfect choice for a stock or slightly modified engine. It is designed with large 1” NPT inlet and outlet flanges that deliver the flow of water more efficiently than a stock single impeller OEM pump. By allowing direct inlet water flow these pumps churn out up to 20% more water than a stock factory pump. These pumps are fully rebuildable and will be the last pump you ever buy!

Available in: Aluminum for fresh water use or Stainless Steel for use in salt water with 1” NPT inlet/outlet and optional 1-1/4” custom billet hose barbs.


1" Male NPT Transom Mount Adjustable Water Pick-Up - 316L Stainless Steel
Your Price:
$249.49

1" Male NPT Transom Mount Adjustable Water Pick-Up - 316L Stainless Steel

410-1078

  • 1" Male NPT fitting.
  • 316L Stainless Steel Bracket Style.
  • Allows for easy install and plumbing.
  • Race Proven!

1" Male NPT Transom Mount Water Pick-Up
Your Price:
$139.99

1" Male NPT Transom Mount Water Pick-Up

410-1079

  • Tube style design allows them to be tailor-fitted to your application.
  • Accepts a standard 1" Male NPT and 1-1/4" inlet hose.
  • Easy 3-bolt attachment.
  • 9-1/2" Long.
  • Cut tube to the length you need.
  • 316L Stainless Steel

1" Marine Hard Water Hose
Your Price:
$9.99

1" Marine Hard Wall Water Hose

100-100-1004

Marine Hard Wall Water Hose 1" I.D.

This hard wall water hose is used in many marine applications and is designed to last in harsh environments.

Water hose is sold by the foot, i.e add quantity of 6 for 6 ft. of hose.


1" Marine Standard Water Hose
Your Price:
$4.99

1" Marine Standard Water Hose

100-132-1006

Standard Softwall Water Hose 1" I.D.

This hose is perfect for plumbing the cooling system for most boats.

Water hose is sold by the foot, i.e add quantity of 6 for 6 ft. of hose.

Hose comes in maximum of 50 feet sections. Please specify if you want sections cut into specific lengths when ordering over 50 feet.


1" Marine Vent / Bilge Hose
Your Price:
$2.99

1" Marine Vent / Bilge Hose

100-150-1180

1" I.D Vent / Bilge Hose

This hose is commonly used for venting or bilge dump.

Vent / Bilge hose is sold by the foot, i.e add quantity of 6 for 6 ft. of hose.

Hose comes in maximum of 50 feet sections. Please specify if you want sections cut into specific lengths when ordering over 50 feet.


1" NPT Adjustable Thru-Hull Pick-up Kit
Your Price:
$239.99

1" NPT Adjustable Thru-Hull Pick-up Kit

410-1082

  • 1" NPT female port.
  • Features an O-Ring Seal.
  • Ma from 316L Stainless Steel.
  • Pick up can be adjusted for perfect placement.
  • Mounting tube has 3" OD
  • Pick-up tube has 1-1/4" OD
  • Overall Length 7"

1" NPT Inlet/Outlet Sea Pump Adapter
Your Price:
$35.99

1" NPT Inlet/Outlet Sea Pump Adapter

625-4150

1" NPT Inlet/Outlet Sea Pump Adapter

These components are designed to assist in the plumbing of your engine when using the Hardin Marine Multi-Stage sea pumps. A wide range of configurations can be created by using different inlet and outlet adapters.


1" NPT Stainless Steel Pipe Plug
Your Price:
$19.99

1" NPT Stainless Steel Pipe Plug

540-223000

1" NPT Stainless Pipe Plug

1" NPT Stainless Steel Water Shut-Off Valve
Your Price:
$89.99

1" NPT Stainless Steel Water Shut-Off Valve

620-913310

1" Stainless Steel Full-Port Ball Valve

FNPT by FNPT Threaded Ends, 2-Piece Body, Full-Port Design with lockable handle, 2000 PSI rated, 316 Stainless Steel Body, Teflon (PTFE) Seals & Seats.


1" NPT Standard Swirl-Away High Performance Sea Strainer
Your Price:
$659.99

1" NPT Standard Swirl-Away High Performance Sea Strainer

620-913202

  • 316L premium stainless steel construction.
  • Cone shaped screen basket provides even greater straining area.
  • Basket is removable for easy cleaning.
  • O-Ring sealed Lexan lid (not cheap plastic)
  • Lid is removed by simple one hand grip knob. No wingnuts!
  • Lid will withstand 100 PSI pressure spikes.
  • Dual 1" NPT inlets and outlets.
  • 3/4" NPT pressure relief port.
  • 360 degree swivel mounting bracket for maximum mounting flexibility.
  • Due to differences in mounting surfaces, hardware for mounting strainer not included.
  • See Additional Info for extended product details.
  • Find Replacement Parts Here

1" NPT Standard Swirl-Away High Performance Sea Strainer
Your Price:
$659.99

1" NPT Tall Swirl-Away High Performance Sea Strainer

620-913201

  • 316L premium stainless steel construction.
  • Tall screen basket provides even greater straining area.
  • Basket is removable for easy cleaning.
  • O-Ring sealed Lexan lid (not cheap plastic)
  • Lid is removed by simple one hand grip knob. No wingnuts!
  • Lid will withstand 100 PSI pressure spikes.
  • Dual 1" NPT inlets and outlets.
  • 3/4" NPT pressure relief port.
  • 360 degree swivel mounting bracket for maximum mounting flexibility.
  • Due to differences in mounting surfaces, hardware for mounting strainer not included.
  • See Additional Info for extended product details.
  • Find Replacement Parts Here

1" NPT  Stainless Steel Water Inlet Crossover
Your Price:
$179.99

1" NPT  Stainless Steel Water Inlet Crossover

410-1503

  • Constructed of 316L Stainless Steel.
  • Fits BBC applications.
  • 1" NPT inlet water crossover (allowing you to use a number of assorted fittings to adapt to your application).
  • Includes bolts and gaskets.

3/4" Marine Bilge Hose

Your Price:
$1.95

1" Pro-Flex Marine Bilge Hose

100-1100 + Option(s)

1" I.D Pro-Flex Marine Bilge Hose

This hose is designed to go from your bilge pump to your water dump It is flexible and easy to route.

  • 2.5:1 RATIO FROM FULLY EXTENDED TO COLLAPSED
  • AVAILABLE IN CONTINOUS PIECES UP TO 75FT
  • RETAINS USER'S DESIRED SHAPE
  • SPACE SAVER AND FLEXIBILITY
  • LIGHTWEIGHT AND CRUSH PROOF
  • PUNCTURE RESISTANT ABRASION RESISTANT AND MINIMUM FLEX STRESS
  • PROPRIETARY POLYOLEFIN COPOLYMER FORMULATION BLENDING PROCESS THAT ENSURES PRODUCT CONSISTENCY
  • CUSTOM COLORS AVAILABLE SOON - CURRENTLY ONLY BLACK AVAILABLE
  • TEMP RANGE -40 TO 160 F
  • MADE IN USA

Water bilge hose is sold by the foot, i.e add quantity of 6 for 6 ft. of hose.


1" Seal Replacement for 620-506 Stuffing Box
Your Price:
$9.95

1" Seal Replacement for 620-506 Stuffing Box

620-502

1" Seal Replacement for 620-506 Stuffing Box