Multiflex Reduction 150 H3 Heavy Duty Steering Helm

The Multiflex H3 Reduction 150 is a mechanical rotary steering helm for compatible outboard, inboard and power-assisted sterndrive steering systems up to 150HP, subject to the ratings of the complete system. It uses the Multiflex SC-16-XX Easy Connect steering cable, provides approximately four steering-wheel turns lock-to-lock and accepts steering wheels up to 400mm / 16in in diameter.

Product Identification

• Brand: Multiflex
• Model / part number: H3
• Product category: Mechanical rotary steering helm
• Helm series: Reduction 150
• Gear design: Reduction gear
• Cable interface: Easy Connect
• Compatible Multiflex cable: SC-16-XX
• Steering-wheel shaft: Standard 19mm / 3/4in tapered shaft
• Shaft length: 97mm
• Maximum system rating: Up to 150HP, subject to complete-system compatibility
• Station configuration: Single-station installations only

What Is This Steering Helm Used For?

The Multiflex H3 converts steering-wheel rotation into push-pull movement through a compatible mechanical steering cable. The opposite end of the cable connects to the engine, rudder or sterndrive steering mechanism.

The helm is intended for single-station mechanical cable steering. It is not a hydraulic helm and is not designed for rack-and-pinion steering cables.

When combined with an SC-16 cable, suitable bezel and correctly rated engine connection components, the H3 forms the helm component of the Multiflex MS3 Reduction 150 steering system.

What Is Included?

This listing is for:

• Multiflex H3 Reduction 150 mechanical steering helm

Not included:

• SC-16 steering cable
• Dashboard bezel kit
• Steering wheel
• Engine connection kit
• Link arm, clamp block or splashwell mounting components
• Other installation-specific hardware unless expressly stated

Which Applications Are Suitable?

The H3 is suitable for correctly specified mechanical steering installations including:

• Compatible outboard systems up to 150HP
• Compatible inboard systems up to 150HP
• Compatible power-assisted sterndrive systems up to 150HP
• Single-station steering installations
• Powerboats using an SC-16 Easy Connect steering cable
• Installations using a steering wheel no larger than 400mm / 16in

The H3 must not be used where the engine power exceeds the boat manufacturer's stated horsepower rating. The permitted rating is always determined by the lowest-rated component in the complete steering system.

Which Steering Cables Are Compatible?

The specified Multiflex cable for the H3 is:

• Multiflex SC-16-XX Easy Connect steering cable

The final two digits in the SC-16-XX cable code identify the cable length in feet.

Multiflex's manufacturer cross-reference maps the SC-16 cable family to:

• SeaStar Solutions / Teleflex SSC62
• Ultraflex M66

The SC-16 is the direct cable specified in the Multiflex MS3 system. SSC62 and M66 references should be treated as selection guidance rather than confirmation of automatic interchangeability. Confirm the helm-end connector, engine-side fitting, cable travel and required length before fitting a cross-reference cable.

Which Cables Should Not Be Listed as Directly Compatible?

Do not list the following as direct H3 cables unless an approved conversion or adaptor has been confirmed:

• Multiflex SC-18
• Ultraflex M58
• SeaStar Solutions SSC131
• Multiflex Lite 55 steering cables
• Rack-and-pinion steering cables
• Hydraulic steering hoses or components

The SC-18, M58 and SSC131 belong to the separate light-duty cable family used with the Multiflex H2 Lite 55 and equivalent helms.

What Other Steering Helms Cross-Reference to the H3?

Multiflex cross-references the H3 helm to:

• SeaStar Solutions / Teleflex SH5094-1P
• Ultraflex T71

These are helm cross-references, not steering-cable part numbers. Cross-reference information should be treated as a selection guide, and interchangeability must be confirmed before installation.

Does the H3 Require a Cable Adaptor?

No separate adaptor is identified for the standard H3 and Multiflex SC-16 Easy Connect cable combination.

When using an SSC62, M66 or another cross-reference cable, confirm whether the exact cable version, retaining arrangement or installation requires an adaptor. Cross-reference equivalence should not be treated as guaranteed direct fit without checking the physical connection.

Which Bezel Kit Is Required?

Compatible H3 bezel kits are available in:

• 90° configurations
• 20° configurations
• Black
• White

The standard Multiflex MS3 packaged system uses the B1B 90° black bezel kit, including its bezel hardware. A bezel is not identified as part of the standalone H3 helm supply.

Is This a No-Feedback Helm?

No. Multiflex identifies the H3 as its standard Reduction 150 steering helm and does not specify a non-reaction or no-feedback mechanism for this model.

A steering cable or cross-reference associated with another no-feedback system does not convert the H3 into a no-feedback helm.

Steering Performance

• Steering-wheel turns: Approximately four turns lock-to-lock
• Maximum steering-wheel diameter: 400mm / 16in
• Helm-shaft length: 97mm
• Steering-wheel shaft: Standard 19mm / 3/4in taper
• SC-16 cable maximum travel: 230mm / 9in
• SC-16 cable minimum bend radius: 200mm / 8in
• Maximum working load at tiller end: 5,000N / 500kg
• Maximum system application: Up to 150HP
• Station configuration: Single station only

The 230mm travel and 200mm minimum bend radius relate to the compatible steering cable and complete H3/SC-16 system rather than the helm housing alone.

Construction and Design

• Mechanical rotary reduction-gear design
• Easy Connect cable interface
• High-pressure die-cast zinc-alloy helm cover
• Galvanised-steel helm shaft
• Standard 3/4in tapered steering-wheel fitting
• 97mm helm-shaft length
• Powder-coated finish for enhanced corrosion resistance
• Similar mounting footprint to comparable mechanical helms
• Designed for quick connection and installation

Installation and Safety

Before installing the Multiflex H3:

• Confirm that the boat, engine and complete steering system are rated for the application
• Use a compatible SC-16 or verified cross-reference steering cable
• Confirm the correct cable length before installation
• Maintain the SC-16 cable's 200mm / 8in minimum bend radius
• Do not kink, crush or sharply bend the steering cable
• Confirm that the steering wheel does not exceed 400mm / 16in
• Check whether an engine link arm, clamp block or splashwell mounting component is required
• Verify that no part of the steering system contacts the transom, splashwell or engine
• Test steering movement from full port lock to full starboard lock
• Repeat the clearance test with the outboard fully lowered and fully tilted
• Do not exceed the rating of the lowest-rated steering component
• Use the system for a single steering station only

Marine steering is a safety-critical system. Installation should be completed according to the current Multiflex instructions by a competent marine technician.

Key Features

• Multiflex H3 Reduction 150 mechanical steering helm
• Suitable for compatible steering systems up to 150HP
• Designed for outboard, inboard and power-assisted sterndrive applications
• Single-station use only
• Reduction-gear design
• Easy Connect cable interface
• Directly specified for Multiflex SC-16 cables
• SC-16 cross-referenced to SSC62 and M66
• H3 helm cross-referenced to SH5094-1P and Ultraflex T71
• Approximately four steering-wheel turns lock-to-lock
• Maximum steering-wheel diameter of 400mm / 16in
• 97mm galvanised-steel shaft
• Standard 19mm / 3/4in tapered wheel fitting
• Maximum steering-cable travel of 230mm / 9in
• Maximum working load of 5,000N / 500kg at the tiller end
• Steering cable, bezel and steering wheel supplied separately