Multiflex H3 Reduction 150 Heavy Duty Single Cable Steering Helm

The Multiflex H3 / LM-H-301 Reduction 150 Mechanical Steering Helm is a single-cable rotary helm for compatible outboard, inboard and power-assisted sterndrive steering systems. It provides approximately four steering-wheel turns, uses a standard 3/4-inch tapered shaft and is designed for the Multiflex SC-16 Easy Connect steering cable.

Product Identification

• Brand: Multiflex
• Model / item code: H3
• Common UK supplier reference: LM-H-301
• Product series: Reduction 150
• Product category: Mechanical marine steering helm
• Product type: Single-cable rotary steering helm
• Steering system: Mechanical cable steering
• Manufacturer mechanism description: Reduction gear design
• Alternative global description: Compact planetary design
• Cable configuration: Single cable
• Number of steering stations: One
• Primary packaged system: MS3-XX
• Compatible Multiflex cable: SC-16-XX
• Official packaged bezel: B1B 90° black
• Published applications: Outboard, inboard and sterndrive
• Published complete-system rating: Up to 150HP
• Steering-wheel turns: Approximately 4
• Maximum steering-wheel diameter: 16in / 400mm
• Shaft length: 97mm
• Steering-wheel shaft: Standard 3/4in taper
• Shaft material: Galvanised steel
• Maximum cable travel: 9in / 230mm
• Minimum cable bend radius: 8in / 200mm
• Maximum working load at tiller end: 5000N / 500kg
• Front-view dimensions: 177.5mm x 137mm
• Rear body projection shown: 119.5mm
• Overall axial length shown: 225mm
• Helm-cover material: Conflicting manufacturer data—zinc alloy or aluminium alloy
• Finish: Powder-coated according to the global product page
• Non-reaction mechanism: Not stated
• Dometic / SeaStar helm cross-reference: SH5094-1P
• Ultraflex helm cross-reference: T71
• Steering cable included: No
• Dashboard bezel included: No
• Steering wheel included: No
• Engine connection kit included: No

What Is the Multiflex H3 Used For?

The H3 is the dashboard-mounted gearbox in a compatible single-cable mechanical steering system. Turning the steering wheel drives the internal gear mechanism and connected steering cable, converting rotary input into linear push-pull movement at the engine, rudder or sterndrive.

• Single-outboard mechanical steering
• Inboard mechanical steering
• Power-assisted sterndrive steering
• Multiflex MS3-XX packaged systems
• Replacement of an existing H3 helm
• New installations using SC-16 cable
• Compatible single-station powerboats

What Is Included?

• 1 x Multiflex H3 Reduction 150 mechanical steering helm

Not included unless expressly stated:

• SC-16 steering cable
• Dashboard bezel
• Steering wheel
• Engine link arm
• Splashwell mounting kit
• Clamp block
• Rudder or tiller connection
• Engine-specific connection hardware
• Hydraulic steering components

How Many Steering Cables Does the H3 Use?

The H3 uses one SC-16 steering cable. The standard MS3 package includes one H3, one SC-16-XX cable and one B1B bezel.

Which Steering Cable Is Compatible?

The directly specified Multiflex cable is the SC-16-XX Easy Connect steering cable. The XX identifies the cable length in feet.

• Dometic / SeaStar cable cross-reference: SSC62
• Ultraflex cable cross-reference: M66
• Maximum travel: 230mm
• Minimum bend radius: 200mm
• Output ends: Stainless steel

Is the H3 Suitable for Engines Up to 150HP?

The complete MS3 system is published for compatible outboard, inboard and sterndrive installations up to 150HP. Do not exceed the boat manufacturer’s horsepower rating or the rating of the lowest-rated steering component.

Is the H3 for Single-Station Steering?

Yes. The H3 system is specified for single-station use only.

Which Bezel Is Used?

• B1B: 90° black bezel used in the MS3 package
• B1W: 90° white bezel
• B2B: 20° black bezel
• B2W: 20° white bezel

The standalone H3 does not include a bezel unless expressly stated.

Which Steering Wheels Are Compatible?

The H3 uses a standard 3/4-inch tapered marine steering-wheel shaft. The wheel must not exceed 16in / 400mm in diameter.

What Are the Published H3 Specifications?

• Steering-wheel turns: Approximately 4
• Maximum wheel diameter: 400mm / 16in
• Shaft length: 97mm
• Maximum cable travel: 230mm / 9in
• Minimum cable bend radius: 200mm / 8in
• Maximum tiller-end working load: 5000N / 500kg

What Are the H3 Dimensions?

• Front-view width: 177.5mm
• Front-view height: 137mm
• Rear body projection shown: 119.5mm
• Overall axial length shown: 225mm

The current H3 fact sheet does not publish the dashboard cutout or mounting-hole pattern. Use the current full-size H3 mounting template before drilling.

What Material Is the H3 Made From?

Multiflex sources agree on a galvanised-steel shaft and standard 3/4-inch taper but conflict on the helm-cover alloy. The Australian fact sheet states zinc alloy, while the global page states aluminium alloy. Confirm the current production version before publishing a specific cover material.

How Does the H3 Differ From the Multiflex H2?

Multiflex H3:

• Reduction 150 system
• Up to 150HP
• SC-16 cable
• Approximately 4 turns
• 97mm shaft
• 230mm travel
• 200mm minimum bend radius

Multiflex H2:

• Lite 55 system
• Up to 55HP
• SC-18 cable
• Approximately 2.5 turns
• 37.5mm shaft
• 228mm travel
• 250mm minimum system bend radius

Which Helms Cross-Reference to the H3?

• Dometic / SeaStar: SH5094-1P
• Ultraflex: T71

Cross-references are supplied for selection guidance only. Confirm the cable connection, shaft, mounting footprint, bezel and rear clearance before substitution.

Is the H3 a Non-Reaction Helm?

No non-reaction or no-feedback mechanism is published for the H3.

Can the H3 Be Used with Hydraulic Steering?

No. The H3 is a mechanical helm and does not replace a hydraulic helm pump, cylinder, hoses or fluid system.

Does the H3 Include Engine Connection Hardware?

No. Link arms, splashwell mounts, clamp blocks, tilt-tube fittings and rudder connections are supplied separately as required by the installation.

Construction and Design

• Multiflex H3 Reduction 150 helm
• Single-cable rotary steering
• Easy Connect interface
• Approximately four steering-wheel turns
• 97mm galvanised-steel shaft
• Standard 3/4-inch taper
• Maximum 400mm steering wheel
• 230mm maximum cable travel
• 200mm minimum cable bend radius
• 5000N tiller-end working load
• Compatible with SC-16 cable
• Single-station use only
• Cross-referenced to SH5094-1P and T71
• Cable, bezel, wheel and engine connection supplied separately

Installation and Safety

• Confirm the H3 model and complete-system rating
• Do not exceed 150HP or the boat manufacturer’s rating
• Use a compatible SC-16 cable
• Obtain the current H3 mounting template
• Confirm dashboard strength and rear clearance
• Use a steering wheel no larger than 400mm
• Maintain a minimum 200mm cable bend radius
• Avoid sharp bends, crushed conduit and heat sources
• Use the correct engine or rudder connection kit
• Check steering from full port to full starboard
• Check outboard clearance through the complete tilt range
• Recheck fasteners after initial operation
• Do not operate the vessel if steering binds or develops excessive play

Installation should be completed by a competent marine technician using the current Multiflex, cable, engine and boat instructions.

Maintenance

• Inspect the helm, cable and engine connection regularly
• Replace a cable showing increased friction or reduced stroke
• Replace corroded or damaged components
• Do not heat a frozen steering system
• Do not repair the helm or cable unless Multiflex provides an approved procedure

Key Features

• Multiflex H3 Reduction 150 steering helm
• Single-cable mechanical steering
• Compatible with SC-16 cable
• Published for systems up to 150HP
• Approximately four steering-wheel turns
• 97mm shaft with standard 3/4-inch taper
• 230mm cable travel
• 200mm minimum bend radius
• 5000N tiller-end working load
• Single-station use only
• SH5094-1P and T71 cross-references
• Steering cable, bezel, wheel and engine hardware supplied separately