Multiflex Complete Heavy Duty Steering Kit

The Multiflex H1, SC-16, B1B and Alpha Complete Heavy-Duty Mechanical Steering Kit combines an H1 Planetary 150 rotary steering helm, a B1B 90° black dashboard bezel, an SC-16 steering cable in the selected length and a 350mm Alpha steering wheel. Choose the black W1B or white W1W wheel. Designed for compatible single-cable mechanical steering installations with engines 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
• Product category: Complete heavy-duty mechanical marine steering kit
• Base packaged steering system: MS1
• Base kit part-number format: MS1-XX
• Retail bundle configurations: MS1-XX + W1B or MS1-XX + W1W
• Steering helm: Multiflex H1
• Helm series: Planetary 150
• Helm design: Mechanical planetary-gear rotary helm
• 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
• Black steering wheel: Multiflex Alpha W1B
• White steering wheel: Multiflex Alpha W1W
• Steering-wheel diameter: 350mm / 13.8in
• Steering-wheel construction: High-strength engineering plastic
• Steering-wheel hub: Inbuilt
• Steering-wheel shaft fitting: Standard 19mm / 3/4in taper
• Maximum published system application: Compatible engines up to 150HP
• Steering configuration: Single-cable mechanical rotary steering
• Station configuration: Single steering station
• Combined retail-bundle manufacturer part number: Not assigned

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

Which Kit Options Are Available?

Choose the Alpha steering-wheel colour and required SC-16 cable length:

• Black-wheel kit: Multiflex H1 helm, B1B black bezel, selected SC-16 cable and W1B black Alpha steering wheel
• White-wheel kit: Multiflex H1 helm, B1B black bezel, selected SC-16 cable and W1W white Alpha steering wheel

Both options use the same H1 helm, B1B 90° black bezel and SC-16 cable. Only the Alpha steering-wheel colour changes.

The dashboard bezel is black in both kit options. Selecting the white W1W steering wheel does not change the bezel to white. The B1W white bezel, B2B 20° black bezel, B2W 20° white bezel and W1G grey Alpha wheel are not included.

What Is Included in the Complete Steering Kit?

• One Multiflex H1 Planetary 150 mechanical steering helm
• One Multiflex SC-16 steering cable in the selected length
• One Multiflex B1B 90° black dashboard bezel kit
• One Multiflex Alpha 350mm steering wheel in the selected colour
• W1B black steering wheel or W1W white steering wheel
• Inbuilt 19mm / 3/4in tapered steering-wheel hub
• One SP-T1 spent-cable tube / protective plastic sleeve
• Two FB-H1 cable-retaining flange bolts
• One MH1-MT dashboard mounting template
• One BC-B1 black plastic bezel cup
• One MB-H1 helm mounting bracket
• Three SH-H1 M8 x 20 helm-mounting bolts
• Three HB-H1 M8 x 45 dashboard-mounting bolts
• One WK-H1 Woodruff shaft key
• Three WS1 M8 washers
• One WS2 M12 washer
• One H-NT1 M12 x 1.75 steering-wheel retaining nut
• Three H-NT2 M8 nyloc nuts
• Two SC-B1 bezel fixing screws
• One MS1 installation manual
• One H1 helm declaration of conformity
• One SC-16 steering-cable declaration of conformity

The Alpha wheel has an inbuilt hub. The official W1B and W1W product information does not separately itemise a loose centre cap, so a centre cap should only be advertised as included where confirmed from the physical wheel package.

This package supplies the primary steering-control components from the steering wheel and helm through to the engine-side SC-16 cable output.

What Is Not Included?

• Engine-specific steering connection kit or drag link
• Outboard engine steering arm
• Engine tilt-tube service parts
• Transom support
• Splashwell steering-cable mount
• Steering-cable clamp block
• Rudder or tiller link arm
• B1W white dashboard bezel
• B2B or B2W 20° dashboard bezel
• W1G grey Alpha steering wheel
• Dashboard reinforcement
• Installation-specific fittings not listed in the package contents
• Professional installation

Check the boat, engine and intended steering arrangement before ordering to establish which engine-side connection and cable-support components are required.

What Is This Complete Steering Kit Used For?

The Alpha steering wheel provides the operator’s steering input. The H1 planetary helm converts steering-wheel rotation into movement of the SC-16 cable’s helical inner member. The cable converts that movement into linear push-pull travel at the engine, rudder or compatible mechanical steering linkage.

The kit is intended for correctly specified installations including:

• Powerboats with compatible engines up to 150HP
• Compatible single-outboard installations
• Compatible inboard or rudder steering arrangements
• Power-assisted sterndrive installations
• Leisure boats
• Fishing boats
• RIBs
• Work boats
• Heavy-duty single-cable mechanical steering
• Dashboards requiring a 90° black bezel
• New mechanical steering-system installations
• Replacement of compatible H1, MS1 or SC-16 systems

The 150HP figure is the maximum published application for the MS1 system. It does not confirm that the kit is compatible with every 150HP engine or boat. Final suitability depends on the boat manufacturer’s rating, engine steering geometry, operating load, cable route, engine connection and rating of every installed component.

How Does the H1 Planetary Helm Work?

The Multiflex H1 uses three or more internally meshed planetary gears. These gears rotate around their own axes and around the helm’s central axis.

This mechanism:

• Distributes steering torque across multiple internal gear contact points
• Reduces concentrated loading within the helm
• Provides a compact steering-helm housing
• Supports smooth rotary movement
• Provides greater efficiency than a basic single-gear mechanism
• Reduces feedback transmitted through the steering wheel
• Converts wheel rotation into movement of the SC-16 cable
• Retains direct mechanical steering control

The H1 is the standard Planetary 150 helm. It is not the H1N non-reaction model, so some engine or rudder torque can still be transmitted back through the steering wheel.

Can the H1 Be Used with Power-Assisted Steering?

Yes. Multiflex lists the H1 for compatible power-assisted sterndrive installations using a steering wheel no larger than 16in / approximately 406mm.

The H1 does not create hydraulic or electric assistance itself. It remains a mechanical helm and must be incorporated into a correctly specified power-assisted steering arrangement. Compatibility must be confirmed with the boat, engine and power-assist manufacturers.

Does the Alpha Steering Wheel Fit the H1 Helm?

Yes. The H1 has a standard 19mm / 3/4in tapered steering-wheel shaft, and the W1B and W1W Alpha wheels have an inbuilt hub designed for standard marine helms with a 3/4in tapered shaft.

The H1 permits:

• Maximum steering-wheel diameter: 406mm / 16in

The included Alpha wheel measures:

• Diameter: 350mm / 13.8in
• Number of spokes: Three
• Construction: High-strength engineering plastic
• Hub: Inbuilt
• Hub fitting: Standard 19mm / 3/4in taper

The 350mm Alpha wheel is therefore within the H1’s maximum wheel-diameter limit. The current official W1B and W1W data do not publish the wheel depth, so dashboard, instrument, throttle-control and windscreen clearance must be checked before installation.

Does the SC-16 Cable Need an Adaptor?

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

The SC-16 helical inner member is inserted into the H1 and drawn into the planetary mechanism by rotating the steering wheel. Its grooved end fitting is aligned with the helm’s retaining hole and secured using the supplied flange bolt. The exposed helical section is covered by the supplied SP-T1 protective sleeve.

Multiflex publishes the following cross-references:

• H1 helm: Ultraflex T71FC
• H1 SeaStar / Dometic cross-reference: None listed
• SC-16 cable: SeaStar / Dometic SSC62
• SC-16 cable: Ultraflex M66
• B1B bezel: SeaStar / Dometic SB27484P
• B1B bezel: Ultraflex X34

These cross-references are selection guides rather than automatic interchangeability guarantees. Confirm the helm connection, cable retention method, travel, cable length, dashboard dimensions and engine-side fitting before substituting another manufacturer’s component.

Is the Kit Suitable for Any 150HP Engine?

No. The MS1 is published for compatible systems up to 150HP, but horsepower alone does not determine fitment.

Before ordering or installing the kit, confirm:

• The boat manufacturer permits the intended engine horsepower
• The engine or rudder supports a compatible mechanical steering connection
• The SC-16 output end suits the selected engine-side hardware
• The cable provides sufficient travel
• The cable can follow the required route without bends below 203mm / 8in
• The engine reaches its full port and starboard positions
• An outboard can move through its full tilt range without pulling or binding the cable
• The Alpha steering wheel has sufficient helm-station clearance
• The H1 is suitable for the steering load
• Every component is rated for the completed installation

The permitted system rating is determined by the boat manufacturer and the lowest-rated component in the complete steering installation.

Steering-System Performance

• Maximum published application: Compatible engines up to 150HP
• Steering-wheel movement: Approximately 4.3 turns through full cable travel
• SC-16 cable travel: 228mm / 9in
• Minimum cable bend radius: 203mm / 8in
• Maximum working load at tiller end: 5,000N / 500kg
• Included steering-wheel diameter: 350mm / 13.8in
• Maximum permitted steering-wheel diameter: 406mm / 16in
• Helm-shaft length: 127.5mm
• Steering-wheel shaft: Standard 19mm / 3/4in taper
• Dashboard installation angle: 90°
• Number of steering cables: One
• Number of steering stations: One
• Helm mounting positions: Five positions at 45° intervals
• Published operating temperature: -20°C to +60°C
• Feedback characteristic: Planetary system designed for greater efficiency and lower feedback
• Non-reaction function: No
• Maximum boat speed: Not stated in the current MS1 product information or installation manual

The Alpha steering wheel does not increase the engine-power rating of the steering system. Capacity is determined by the complete steering arrangement rather than by the wheel alone.

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

• Multiflex SC-16 mechanical steering cable
• Part-number format SC-16-XX
• XX identifies the nominal cable length in feet
• Directly specified for the Multiflex H1 helm
• Used in the MS1 Planetary 150 package
• Mechanical push-pull construction
• Helical inner member at the helm end
• Grooved helm-end fitting
• Stainless-steel output ends
• 228mm / 9in complete-system travel
• Minimum bend radius of 203mm / 8in
• Maximum published tiller-end working load of 5,000N / 500kg
• Exceeds ISO 8848 and ISO 9775
• SeaStar / Dometic SSC62 cross-reference
• Ultraflex M66 cross-reference

The steering cable is a sealed, fixed-length component and should not be shortened, cut or modified.

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

Measure dimensions A, B and C along the intended steering-cable route in centimetres. Count the number of 90° bends and establish whether the cable will pass through the engine tilt tube or use a 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 the measurement 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 complete model and length marking printed on the existing cable wherever possible. Do not order a cable shorter than the calculated measurement.

Alpha Steering-Wheel Construction

• Multiflex Alpha standard marine steering wheel
• Black W1B or white W1W option
• 350mm / 13.8in diameter
• Three-spoke design
• High-strength engineering-plastic construction
• Inbuilt steering-wheel hub
• Standard 19mm / 3/4in tapered helm fitting
• Suitable for the H1 helm’s standard tapered shaft
• Wheel depth not stated in current official product data
• Separate wheel-specific compliance standard not stated
• Loose centre-cap contents not separately itemised

The W1B and W1W have the same published construction, diameter and shaft fitment. The stated difference is the steering-wheel colour.

B1B Bezel Kit

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

The supplied bezel assembly includes:

• B1B 90° black bezel kit
• BC-B1 black plastic bezel cup
• MB-H1 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 steering-wheel retaining nut
• Two ABS bezel fixing screws

The B1W 90° white bezel and B2B/B2W 20° bezels are alternative products and are not included in this listing.

H1 Helm Dimensions

• Front-view height: 137mm / approximately 5.39in
• Left edge to shaft centreline: 86.5mm / 3.40in
• Shaft centreline to right edge: 64mm / 2.51in
• Rear helm-body projection: 120mm / 4.72in
• Overall axial length shown: 247mm / 9.72in
• Steering-wheel shaft length: 127.5mm

Check these dimensions against the available dashboard and rear-console space before installation.

Helm, Bezel and Cable Construction

• H1 compact planetary-gear steering helm
• High-pressure die-cast aluminium-alloy helm cover
• Powder-coated helm finish
• Galvanised-steel steering-wheel shaft
• Standard 19mm / 3/4in tapered wheel fitting
• Five selectable helm mounting positions
• B1B black 90° engineering-plastic bezel
• SC-16 cable with stainless-steel output ends
• Mechanical helical cable-to-helm interface
• Grooved cable-end retention
• Direct H1-to-SC-16 connection
• SP-T1 protective sleeve for the spent helical cable section

The planetary arrangement distributes steering torque through multiple internally meshed gears, providing greater efficiency and lower feedback while retaining direct mechanical steering control.

Standards and Certifications

• MS1 steering system: Conforms to the Recreational Craft and Personal Watercraft Directive 2013/53/EU
• MS1 conformity standard: EN ISO 8848:1995/A1:2000
• SC-16 steering cable: Exceeds ISO 8848 and ISO 9775
• H1 declaration of conformity: Included in the official MS1 packing list
• SC-16 declaration of conformity: Included in the official MS1 packing list
• Alpha W1B/W1W wheel-specific standard: Not stated in the current official wheel product information

No wheel-specific CE, NMMA, UKCA, EN or ABYC claim should be added unless separately confirmed for the Alpha W1B or W1W.

Installation Notes

The Multiflex MS1 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
• Bezel-bracket mounting torque: 15Nm
• Helm-to-bracket mounting torque: 25Nm
• SC-16 cable flange-bolt torque: 6Nm
• Minimum cable bend radius: 203mm / 8in
• Recommended cable support interval: Approximately every 2m / 6ft
• Helm mounting positions: Five positions at 45° intervals

The manual contains conflicting steering-wheel retaining-nut torque instructions. Follow the current instructions supplied with the actual H1 helm and Alpha wheel rather than relying on a single extracted value from the earlier manual edition.

Route the SC-16 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 SC-16 cable length is correct
• The Alpha wheel is securely fitted to the H1 tapered shaft
• The steering wheel clears the dashboard, instruments and controls
• The Woodruff key and retaining hardware are correctly installed
• The SC-16 cable is fully engaged with the helm
• Both cable-retaining flange bolts are secure
• The protective sleeve covers the exposed helical cable section
• The cable remains above the 203mm / 8in bend-radius limit
• 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
• The cable does not bottom out before the steering mechanism reaches its stop
• Full steering movement remains available throughout an outboard’s tilt range
• All bolts, nuts and fasteners are rechecked after the first two operating hours

Multiflex specifies servicing every 30 days for saltwater use and every 90 days for freshwater use, with specialist inspection at least every two years. Marine steering is safety-critical and installation should be completed by a competent marine technician using the current instructions.

Key Features

• Complete helm, bezel, cable and steering-wheel package
• Multiflex H1 Planetary 150 steering helm
• Multiflex SC-16 cable supplied in the selected length
• Multiflex B1B 90° black bezel included
• Multiflex Alpha 350mm steering wheel included
• Choice of W1B black or W1W white wheel
• High-strength engineering-plastic wheel construction
• Three-spoke Alpha steering-wheel design
• Inbuilt steering-wheel hub
• Standard 19mm / 3/4in tapered wheel fitting
• Intended for compatible engines up to 150HP
• Suitable for compatible powerboats
• Suitable for compatible power-assisted sterndrives
• Single-cable mechanical steering
• Single-station configuration
• Compact planetary-gear mechanism
• Higher-efficiency, lower-feedback operation
• 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 permitted steering-wheel diameter of 406mm / 16in
• Included Alpha wheel diameter of 350mm / 13.8in
• Included wheel is within the H1 diameter limit
• Five helm mounting positions at 45° intervals
• High-pressure die-cast aluminium-alloy helm cover
• Powder-coated helm finish
• Galvanised-steel helm shaft
• Stainless-steel SC-16 cable output ends
• Direct H1-to-SC-16 connection
• No separate helm-to-cable adaptor required
• SC-16 cable exceeds ISO 8848 and ISO 9775
• MS1 conforms to Directive 2013/53/EU in accordance with EN ISO 8848
• Engine-specific steering connection components not included
• No maximum boat speed stated in current MS1 data

Frequently Asked Questions

Is the Alpha steering wheel included? Yes. The kit includes one 350mm Multiflex Alpha steering wheel in the selected W1B black or W1W white configuration.

Does the steering wheel have a hub? Yes. Multiflex specifies an inbuilt hub for the Alpha W1B and W1W wheels.

Does the Alpha wheel fit the H1 helm? Yes. The wheel and H1 helm use a standard 19mm / 3/4in tapered connection. The 350mm wheel is also below the H1’s 406mm maximum wheel diameter.

Is a centre cap included with the Alpha wheel? The current official W1B and W1W product information does not separately itemise a centre cap. Confirm the contents of the physical wheel package before advertising one.

Is the B1B bezel included? Yes. One B1B 90° black dashboard bezel and its standard mounting components are included.

Does the white-wheel kit include a white bezel? No. Both wheel options use the same black B1B bezel. Only the Alpha wheel changes from black W1B to white W1W.

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

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

Is the H1 a non-reaction helm? No. The H1 is the standard Planetary 150 helm. The H1N is the separate non-reaction version.

Can this kit be used on any 150HP engine? No. The 150HP figure is the maximum published system application. The boat rating, engine steering arrangement, operating load, cable route and engine-side connection must all be compatible.

Can an Ultraflex M66 or SeaStar SSC62 replace the SC-16? Multiflex lists the M66 and SSC62 as cross-references. Confirm the exact connection, retention arrangement, travel, cable length and engine-side fitting before substitution.

Is the engine connection kit included? No. Any required drag link, steering arm, clamp block, transom support or splashwell mounting component must be selected separately.

Does Multiflex state a maximum boat speed for the MS1? No maximum boat speed is stated in the current official MS1 product information or installation manual.