Multiflex H1 Planetary 150 Helm And SC-16 Steering Cable Heavy Duty Steering Bundle

The Multiflex H1, B1B and SC-16 Planetary Steering Kit combines a planetary rotary steering helm, a black B1B 90° dashboard bezel and a Multiflex SC-16 mechanical steering cable in the selected length. Designed for compatible single-station mechanical steering systems up to 150HP, the system provides approximately 4.3 steering-wheel turns, 228mm / 9in cable travel and a minimum cable bend radius of 203mm / 8in. 

Product Identification

• Brand: Multiflex
• Packaged steering-system model: MS1
• Kit part-number format: MS1-XX
• Product category: Mechanical planetary steering helm, bezel and cable kit
• Steering helm: Multiflex H1
• Helm reference: H1 / LM-H-101
• Helm series: Planetary 150
• Dashboard bezel: Multiflex B1B
• Bezel colour: Black
• Bezel installation angle: 90°
• Steering cable: Multiflex SC-16
• Cable part-number format: SC-16-XX
• Cable length: Selected when ordering
• Steering-wheel shaft: Standard 19mm / 3/4in tapered shaft
• Steering configuration: Single-cable mechanical planetary steering
• Station configuration: Single steering station
• Feedback system: Standard planetary steering with reduced feedback
• Non-reaction mechanism: No; H1N is the separate non-reaction helm
• Maximum published system application: Up to 150HP, subject to complete-system compatibility
• Steering wheel included: No

The XX suffix identifies the nominal steering-cable length in feet. For example, MS1-12 denotes an MS1 package supplied with a nominal 12ft SC-16 cable.

Which Kit Option Is Included?

This listing is for the standard black-bezel MS1 package:

• Multiflex H1 Planetary 150 steering helm
• Multiflex B1B 90° black dashboard bezel
• Multiflex SC-16-XX steering cable in the selected length

The following alternative bezels are not included:

• B1W 90° white bezel
• B2B 20° black bezel
• B2W 20° white bezel

What Is Included in the Kit?

• One Multiflex H1 Planetary 150 mechanical steering helm
• One Multiflex SC-16 steering cable in the selected length
• One Multiflex B1B 90° black bezel kit
• Helm mounting bracket
• Black engineered-plastic bezel cup
• Spent-cable tube / plastic protective sleeve
• Two cable-retaining flange bolts
• Three M8 x 20 helm-mounting bolts
• Three M8 x 45 dashboard-mounting bolts
• Three M8 washers
• Three M8 nyloc nuts
• One steering-wheel shaft Woodruff key
• One M12 washer
• One M12 x 1.75 nyloc steering-wheel retaining nut
• Two bezel fixing screws
• Dashboard mounting template
• Installation manual
• Helm and steering-cable declarations of conformity

The package supplies the helm, dashboard mounting components and selected steering cable required to form the central portion of a correctly specified mechanical steering installation.

What Is Not Included?

• Steering wheel
• Steering-wheel centre cap
• Engine-specific steering connection kit or drag link
• Outboard engine steering arm
• Engine tilt-tube service components
• Transom support
• Splashwell mounting kit
• Steering-cable clamp block
• Rudder or tiller link arm
• Alternative 20° or white bezel
• Dashboard reinforcement
• Installation-specific fittings not shown in the package contents
• Professional installation

A compatible steering wheel and any required engine-side connection components must be purchased separately.

How Does the H1 Planetary Steering Helm Work?

The Multiflex H1 uses a planetary gear mechanism. Multiple gears rotate around the helm’s central axis, distributing steering torque through several internal contact points rather than applying the load through a single gear.

This design:

• Distributes steering torque across the internal gear mechanism
• Provides a compact helm housing
• Supports smooth rotary movement
• Reduces backlash within the helm mechanism
• Provides lower feedback than a basic single-gear helm
• Transfers steering-wheel rotation to the SC-16 cable
• Retains direct mechanical steering control

When the steering wheel is turned, the H1 draws the SC-16 cable’s helical inner member through the helm. The cable converts this rotary input into linear push-pull movement at the engine, rudder or sterndrive steering connection.

The H1 is not a non-reaction or no-feedback helm. Some engine or rudder torque can still be transmitted back through the steering wheel. The Multiflex H1N is the separate model intended for applications requiring a non-reaction mechanism.

Which Boats and Engines Is the Kit Intended For?

The MS1 kit is intended for correctly specified single-station mechanical steering installations including:

• Compatible single-outboard powerboats
• Compatible inboard steering installations
• Compatible power-assisted sterndrive installations
• RIBs
• Leisure boats
• Fishing boats
• Work boats
• Boats requiring a planetary rotary steering helm
• Installations using a single SC-16 mechanical steering cable
• Dashboards requiring a 90° black bezel
• Compatible systems with an engine rating up to 150HP

The 150HP figure is a maximum system application, not universal confirmation that the kit fits every 150HP engine. Final suitability depends on:

• The boat manufacturer’s maximum horsepower rating
• Engine type and steering geometry
• Boat speed
• Engine steering torque
• Steering-cable route
• Required cable length
• Engine-side connection
• Steering-wheel diameter
• Ratings of every component in the installed system

The installation must remain within the rating of the lowest-rated component.

Can the H1 Be Used with Power-Assisted Steering?

Yes. The H1 may form part of a correctly specified power-assisted sterndrive mechanical steering system.

The H1 does not itself provide hydraulic or electric power assistance. It remains a mechanical helm and must be connected to a compatible SC-16 cable and an approved power-assisted steering arrangement.

Do not use it with an unsupported power-assist system or assume compatibility solely from engine horsepower.

Is the Steering Wheel Included?

No. The steering wheel is not included in this kit.

The H1 uses a standard 19mm / 3/4in tapered steering-wheel shaft. A compatible marine steering wheel must be ordered separately.

• Maximum steering-wheel diameter: 406mm / 16in
• Helm-shaft length: 127.5mm
• Shaft material: Galvanised steel
• Shaft profile: Standard 19mm / 3/4in taper
• Woodruff key, washer and retaining nut: Included
• Steering wheel and centre cap: Not included

Check the clearance around the dashboard, instruments, throttle controls and windscreen before selecting a steering wheel.

Steering-System Performance

• Maximum published application: Compatible systems up to 150HP
• Steering-wheel movement: Approximately 4.3 turns lock-to-lock
• SC-16 cable travel: 228mm / 9in
• Minimum cable bend radius: 203mm / 8in
• Maximum working load at tiller end: 5,000N / 500kg
• Maximum steering-wheel diameter: 406mm / 16in
• Helm-shaft length: 127.5mm
• Steering-wheel shaft: Standard 19mm / 3/4in taper
• Number of steering cables: One
• Number of steering stations: One
• Dashboard installation angle: 90°
• Helm mounting positions: Five selectable positions at 45° intervals
• Published operating ambient temperature: -20°C to +60°C
• Feedback type: Standard planetary steering with lower feedback
• Non-reaction function: No

Some Multiflex fact-sheet values are rounded to approximately four turns, 230mm travel, a 200mm bend radius, a 400mm wheel and a 125mm shaft. The installation manual publishes the more precise values shown above.

What Are the Features of the SC-16 Steering Cable?

• Mechanical push-pull steering cable
• Direct connection to the Multiflex H1 helm
• Helical inner member at the helm end
• Grooved helm-end fitting retained by a flange bolt
• Stainless-steel output ends
• 228mm / 9in maximum travel
• 203mm / 8in minimum bend radius
• Maximum published tiller-end working load of 5,000N / 500kg
• Available in nominal one-foot length increments
• Part-number format SC-16-XX
• Exceeds ISO 8848 and ISO 9775
• Designed for marine steering applications
• Suitable for the Multiflex MS1 system

The final two digits in the cable part number identify its nominal length in feet. For example, SC-16-12 denotes a nominal 12ft cable.

Does the SC-16 Cable Need an Adaptor?

No separate adaptor is required between the included Multiflex H1 helm and SC-16 cable.

The SC-16 helical inner member is inserted into the H1 helm and drawn into the planetary gear mechanism by rotating the steering wheel. The grooved cable fitting is then retained using the supplied flange bolt.

Multiflex cross-references the SC-16 cable family to:

• SeaStar Solutions / Teleflex SSC62
• Ultraflex M66

Multiflex cross-references the H1 helm to:

• Ultraflex T71FC

The B1B bezel is cross-referenced to:

• SeaStar Solutions / Dometic SB27484P
• Ultraflex X34

These cross-references are selection guides rather than universal direct-fit guarantees. Confirm the connector, retaining arrangement, travel, cable length, engine-side fitting and dashboard dimensions before substituting another brand.

How Do You Select the Correct SC-16 Cable Length?

Measure dimensions A, B and C along the proposed cable route in centimetres. Also count the number of 90° bends and identify whether the cable will pass through the engine tilt tube or use a separate transom or splashwell support.

For installation through an engine tilt tube:

• 1. Add dimensions A + B + C.
• 2. Subtract 10cm for each 90° bend.
• 3. Add 30.5cm for the engine tilt-tube installation.
• 4. Divide the result by 30.5 to convert the measurement to feet.
• 5. Round up to the next whole-foot cable length.

Formula: A + B + C − 10cm per 90° bend + 30.5cm.

For transom-support or splashwell mounting:

• 1. Add dimensions A + B + C.
• 2. Subtract 10cm for each 90° bend.
• 3. Divide the result by 30.5 to convert it to feet.
• 4. Round up to the next whole-foot cable length.

Formula: A + B + C − 10cm per 90° bend.

For replacement installations, check the model and length marking printed on the removed steering cable. Do not order a cable shorter than the calculated length.

B1B Bezel Kit

The included Multiflex B1B is a black 90° dashboard bezel manufactured from engineering plastic. It mounts between the steering wheel and dashboard, supports the H1 helm mounting bracket and covers the dashboard opening and mounting hardware.

The B1B package includes:

• Black 90° engineered-plastic bezel cup
• Helm mounting bracket
• Three M8 x 20 helm-mounting bolts
• Three M8 x 45 dashboard-mounting bolts
• Three M8 washers
• Three M8 nyloc nuts
• One Woodruff shaft key
• One M12 washer
• One M12 x 1.75 nyloc nut
• Two bezel fixing screws

The B1B is intended for compatible:

• Multiflex H1 helms
• Multiflex H1N helms
• Multiflex H3 helms

The B1W 90° white bezel and B2B/B2W 20° bezels are not included.

Construction and Compliance

• Compact planetary gear helm design
• High-pressure die-cast aluminium-alloy helm cover
• Powder-coated helm finish
• Galvanised-steel helm shaft
• Standard 19mm / 3/4in tapered wheel fitting
• Engineering-plastic B1B bezel
• Stainless-steel SC-16 cable output ends
• Mechanical helical cable-to-helm interface
• Single-cable steering configuration
• Single-station configuration
• MS1 system conformity with Recreational Craft and Personal Watercraft Directive 2013/53/EU
• MS1 system conformity in accordance with EN ISO 8848:1995/A1:2000
• SC-16 cable exceeds ISO 8848 and ISO 9775

Installation Notes

The installation manual specifies:

• Dashboard thickness: 12.7–54mm / 0.5–2.1in
• Minimum clearance behind dashboard: 130mm
• Central dashboard cut-out: 83mm / 3.25in
• Dashboard mounting holes: Three holes, each 10mm / 3/8in
• Minimum cable bend radius: 203mm / 8in
• Cable support interval: Approximately every 2m / 6ft
• Helm mounting positions: Five positions at 45° intervals

Route the cable away from:

• Sharp dashboard openings
• Cutting edges
• Heat sources
• Electrical wiring
• Moving engine components
• Areas where the conduit may be crushed
• Tight or unsupported bends

Do not secure the steering cable to electrical wiring.

After installation, confirm that:

• The selected cable length is correct
• The steering wheel is securely installed on the tapered shaft
• The cable is fully engaged with the H1 helm
• Both cable-retaining flange bolts are secure
• The cable remains above its minimum bend radius
• Clockwise wheel movement steers the boat to starboard
• Anticlockwise wheel movement steers the boat to port
• The engine or rudder reaches its complete steering range
• No interference occurs with the transom, splashwell or engine
• Full steering movement remains available with an outboard tilted up and down
• The cable does not bottom out before the engine or rudder reaches its stop
• All bolts, nuts and fasteners are checked after the first two operating hours

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

Key Features

• Official Multiflex MS1 packaged steering system
• H1 Planetary 150 mechanical steering helm
• SC-16 steering cable supplied in the selected length
• B1B 90° black bezel kit included
• Intended for compatible systems up to 150HP
• Suitable for selected outboard applications
• Suitable for selected inboard applications
• Suitable for compatible power-assisted sterndrives
• Single-cable steering configuration
• Single-station use only
• Compact planetary gear mechanism
• Lower-feedback standard mechanical steering
• Approximately 4.3 steering-wheel turns
• 228mm / 9in cable travel
• 203mm / 8in minimum cable bend radius
• 5,000N / 500kg maximum tiller-end working load
• Maximum steering-wheel diameter of 406mm / 16in
• Standard 19mm / 3/4in tapered helm shaft
• High-pressure die-cast aluminium-alloy helm cover
• Powder-coated helm finish
• Galvanised-steel helm shaft
• Stainless-steel cable output ends
• Engineering-plastic bezel
• Direct H1-to-SC-16 connection
• Exceeds ISO 8848 and ISO 9775
• Selected cable length identified by the XX suffix
• Engine-specific connection components not included
• Steering wheel not included

Frequently Asked Questions

Is a steering wheel included? No. The package includes the H1 helm, B1B black bezel, selected SC-16 cable and the listed mounting hardware. A compatible steering wheel must be purchased separately.

Is the B1B bezel included? Yes. One B1B 90° black bezel and its associated mounting hardware are included.

Which steering wheel fits the H1 helm? Use a compatible marine steering wheel with a standard 19mm / 3/4in tapered hub. The wheel must not exceed 406mm / 16in in diameter.

Is the H1 a no-feedback helm? No. The H1 uses a standard planetary mechanism that provides lower feedback, but it is not a non-reaction helm. The H1N is the separate Multiflex non-reaction model.

Can the kit be used on any 150HP engine? No. The 150HP figure is the maximum published application. The boat, engine, cable route, steering connection, speed and every installed steering component must be compatible.

Is the SC-16 cable included? Yes. One SC-16 cable in the length selected when ordering is included.

Does the H1 require an adaptor for the SC-16 cable? No separate adaptor is required for the standard H1 and SC-16 combination.

Can an Ultraflex M66 or SeaStar SSC62 replace the SC-16? Those cable families are manufacturer cross-references. Confirm the exact connector, retention system, travel, output fitting and cable length before substitution.

Is an engine drag link included? No. Any engine-specific drag link, steering arm, clamp block, transom support or splashwell mounting component must be selected separately.