Hardin Marine

5" Single Grip Billet Aluminum Grab Handle

Your Price:
$37.99

5" Single Grip Billet Aluminum Grab Handle

125-BH100 + Option(s)

5" Single Grip Billet Aluminum Grab Handle - Each

Hardin Marine offers this popular grab handle constructed from billetaluminum in both a single grip 5" version and a dual grip 9"version. Both handles feature blind tapped holes allowing them to bemounted with no hardware exposed. These handles work great inconjunctionwith the Hardin Marine billet vents.

*Note- These grab handles are 7" long with 5" bolt centers


4-1/2" I.D. External Flapper
Your Price:
$44.99

5" to 6" I.D. External Flapper

810-EG-500

5" - 6" I.D. External Flapper

These are excellent American-made flaps that will not curl like cheap import copies. These are a must for boats with a very close distance between exhaust ports and the water line Clamp is included.  Sold each.

NOTE: THIS FLAP HAS A 6" I.D. AND MUST BE CUT DOWN TO GO ON 5" TUBE!


5" Stainless Steel Exhaust Flappers
Your Price:
$329.99

5" Stainless Steel Exhaust Flappers

410-280177

5" Stainless Steel Exhaust Flappers (pair)

If you're like us and can't stand the ugly sight of those black rubber Salisbury style flappers then feast your eyes on this piece.  Hardin Marine has handcrafted these beautifully polished stainless steel exhaust flappers to eliminate that eyesore.  The flappers feature and O-ring seal to eliminate the possibility of any noise from the flapper during normal operation.  This new flapper represents the ultimate finishing touch to your boats exhaust system.  Available in 4", 4-1/2" or 5" sizes.


5/16" Stainless Steel Washer
Your Price:
$1.50

5/16" Stainless Steel Washer

900-31AN-STSS

5/16" Stainless Steel Washer.


5/16"-16 Allen Bolt, 0.75" Long
Your Price:
$1.59

5/16"-16 Allen Bolt, 0.75" Long

900-31C075-SHS

5/16"-24 Allen Bolt, 0.75" Long. Coarse Thread


5/16"-18 Hex Head Bolt, 4.00" Long
Your Price:
$4.25

5/16"-18 Hex Head Bolt, 4.00" Long

900-31C400-HHS

5/16"-18 Hex Head Bolt, 4.00" Long


5/16"-18 Hex Head Bolt, 6.00" Long
Your Price:
$4.99

5/16"-18 Hex Head Bolt, 6.00" Long

900-31C600-HHS

5/16"-18 Hex Head Bolt, 6.00" Long


5/16"-18 Hex Head Bolt, 8.00" Long
Your Price:
$10.99

5/16"-18 Hex Head Bolt, 8.00" Long

900-31C800-HHS

5/16"-18 Hex Head Bolt, 8.00" Long


5/16"-18 Hex Head Bolt, 8.50" Long
Your Price:
$13.75

5/16"-18 Hex Head Bolt, 8.50" Long

900-31C850-HHS

5/16"-18 Hex Head Bolt, 8.50" Long


5/16"-24 Allen Bolt, 0.75" Long
Your Price:
$2.75

5/16"-24 Allen Bolt, 0.75" Long

900-31F075-SHS

5/16"-24 Allen Bolt, 0.75" Long


5/16-18" Stainless Steel Nylon Lock Nut - Half Height
Your Price:
$1.75

5/16-18" Stainless Steel Nylon Lock Nut - Half Height

900-31CN-HNSS

5/16-18" Stainless Steel Nylon Lock Nut - Half Height, Coarse Thread.


5/8" Left Hand Male Rod End
Your Price:
$61.99

5/8" Left Hand Male Rod End

135-5858L

5/8" Left Hand Male Rod End

These rod ends are all stainless steel


5/8" Marine Bilge Hose
Your Price:
$0.99

5/8" Marine Bilge Hose

100-120-0586

5/8" I.D Bilge Hose

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

Water 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.


5/8" Marine Fuel Line Hose
Your Price:
$3.99

5/8" Marine Fuel Line Hose

100-350-0580

Marine Fuel Line Hose 5/8" I.D.

  • This is true USCG approved marine grade fuel hose /li>
  • This is A-2 grade hose

Don't take any chances with your investment Use only marine grade hose.

Fuel line 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.


5/8" Marine Standard Water Hose
Your Price:
$2.99

5/8" Marine Standard Water Hose

100-130-0580

Standard Water Hose 5/8" 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.


5/8" Marine Vent / Bilge Hose
Your Price:
$0.99

5/8" Marine Vent / Bilge Hose

100-150-0586

5/8" 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.


5/8" Right Hand Male Rod End
Your Price:
$61.99

5/8" Right Hand Male Rod End

135-5858R

5/8" Right Hand Male Rod End

These rod ends are all stainless steel


5/8" Stainless Steel Right Angle Fuel Vent
Your Price:
$27.99

5/8" Stainless Steel Right Angle Fuel Vent

620-1025

5/8" Stainless Steel Right Angle Fuel Vent

These stainless steel fuel vents offer an almost completely flush finish leaving no protruding hardware. Each vent comes complete with nut and backing plate. This vent is perfect in harsh corrosive environments.


5/8" Stainless Steel Straight Fuel Vent
Your Price:
$26.99

5/8" Stainless Steel Straight Fuel Vent

620-1024

5/8" Stainless Steel Straight Fuel Vent

These stainless steel fuel vents offer an almost completely flush finish leaving no protruding hardware. Each vent comes complete with nut and backing plate. This vent is perfect in harsh corrosive environments. Flange O.D. is 1.820".


5/8" Stainless Steel Washer
Your Price:
$0.92

5/8" Stainless Steel Washer

900-62AN-STSS

5/8" Stainless Steel Washer.


5/8" Vent Adapter 90 Degree Angle Mount
Your Price:
$10.99

5/8" Vent Adapter 90 Degree Angle Mount

725-2700

5/8" Vent Adapter 90 Degree Angle Mount

Vent adaptors allow you to connect vent hoses from your valve covers or fuel pump to a flame arrestor assembly.


5/8" x 3/4" Valve Cover Vent Extension
Your Price:
$4.95

5/8" x 3/4" Valve Cover Vent Extension

620-70182

5/8" x 3/4" Valve Cover Vent Extension

This gold irridited valve cover vent extension is commonly used to vent crankcase emissions to your flame arrestor.


5/8-18" Stainless Steel Nylon Lock Nut - Half Height
Your Price:
$6.99

5/8-18" Stainless Steel Nylon Lock Nut - Half Height

900-62FN-HNSS

5/8-18" Stainless Steel Nylon Lock Nut - Half Height, Coarse Thread.


50 Amp Mercury Style Circuit Breaker
Your Price:
$49.99

50 Amp Mercury Style Circuit Breaker

755-3514

50 Amp Mercury Style Circuit Breaker

These breakers are the most common marine units used on factory style as well as aftermarket marine engines and harnesses. Be careful not to exceed the original amperage rating of your existing harness.


500 EFI Flame Arrestor Upgrade Kit
Starting From:
$1,699.99
This Part has options, please click the button below to order.

500 EFI Flame Arrestor Upgrade Kit

755-68 + Option(s)

500 EFI Flame Arrestor Upgrade Kit

Hardin Marine has taken your factory Mercury Racing EFI throttle body and combined their precision machining and tuning experience into a power producing option for all Mercury 500/525 EFI applications. High flow throttle bodies wake these engines up. Boasting more than 60% more air inlet surface area, these units will now support air flow needs of up to 900 horsepower. So whether you want to own the hottest looking flame arrestor for appearance reasons or performance reasons, Hardin marine has it.

Hardin Marine will also recalibrate your Mercury ECU (computer) to yield the very most of your engines power The ECU precisely controls fuel requirements, detonation control, idle speed and RPM limitations We have dyno-tested multiple combinations and know what works!

Components Include:
  • HP 500 Flame Arrestor
  • 500 EFI Tuned & Bored Throttle Body 1000CFM
  • Computer Re-Calibration & Monitoring (ECU) - Non Supercharged Engine
  • HP 500 / 525 Flow Command Fuel Pressure Regulator


500 EFI Polished Thermostat Housing To Exhaust Stainless Steel Hard Lines
Your Price:
$475.99

500 EFI Polished Thermostat Housing To Exhaust Stainless Steel Hard Lines

755-4104

  • Designed specifically for the popular Mercury 500EFI engine package.
  • Replaces factory rubber hoses.
  • Kit includes four stainless steel tube lines.
  • Hose & Clamps sold separately.

500 EFI Tuned & Bored Throttle Body 1000CFM
Your Price:
$629.99

500 EFI Tuned & Bored Throttle Body 1000CFM

620-15530

500 EFI Tuned & Bored Throttle Body 1000CFM

Hardin Marine has taken your factory Mercury Racing EFI throttle body and combined their precision machining and tuning experience into a power producing option for all Mercury 500/525 EFI applications. High flow throttle bodies wake these engines up.

These “Monoblade” flow 1000 CFM to match Mercury’s 525HP EFI engine. The “Monoblade” has self lubricating bronze bushings for the shaft to rotate on, knife edged stainless steel throttle blade, Stock OEM sensors and throttle cable mounts in the original location. 25 HP gain is available with recalibration of the ecu and the throttle valve. Port matching to the plenum chamber and the center divider is required to be removed from the inlet of manifold allowing room for the throttle body blade to move freely.

Now that the units match the 525 efi size. This takes a 525 gasket where it mates to the manifold not the original o-ring that the 500s had. One bolt hole needs to be clearance d slightly once the gasket is laid on the throttle body. The front is machined and drilled/tapped 5/16 fine thread and now accepts the 525 flame arrestor.

Optional High Flow flame arrestor is suggested #625-5250

Note: You will have to remove and send in your throttle body to have this process done. This is not a shelf item. Please call our technical staff for any questions or assistance on the process.

Sold as an Exchange, $500.00 Core Charge.