Multiflex H1.2 Planetary 300 Heavy Duty Dual Cable Steering Helm

The Multiflex H1.2 Planetary 300 Steering Helm is a compact mechanical rotary helm designed to operate two compatible steering cables. Its planetary gear mechanism converts steering-wheel rotation into push-pull cable movement, while the powder-coated, high-pressure die-cast aluminium-alloy cover and galvanised-steel 3/4-inch tapered shaft provide a corrosion-resistant mechanical steering interface for marine installations.

Product Identification

• Brand: Multiflex
• Model / item code: H1.2
• Product series: Planetary 300
• Product category: Mechanical marine steering helm
• Product type: Dual-cable rotary steering helm
• Alternative descriptions: Twin-cable helm, double-cable steering helm or planetary rotary helm
• Steering system: Mechanical cable steering
• Helm mechanism: Planetary gear design
• Cable configuration: Twin / dual cable
• Number of helm cable connections: Two
• Number of steering stations: One
• Primary packaged system: Multiflex MS1.2
• Official MS1.2 cable configuration: Two SC-16 steering cables
• Official MS1.2 bezel: B1B
• Official packaged-system application: Twin engines up to 300HP
• 300HP definition: Not clarified as combined or per engine
• Helm-cover material: High-pressure die-cast aluminium alloy
• Helm-cover finish: Powder-coated
• Shaft material: Galvanised steel
• Steering-wheel shaft: Standard 3/4-inch taper
• Fixed or tilt helm: Fixed-shaft helm
• Separate tilt version: TH1.2
• Non-reaction mechanism: Not stated for H1.2
• Closest Ultraflex cross-reference: T72FC
• SeaStar / Teleflex helm cross-reference: None published by Multiflex
• Primary Multiflex cable: SC-16
• SC-16 SeaStar / Teleflex cross-reference: SSC62
• SC-16 Ultraflex cross-reference: M66
• Steering cables included: No
• Dashboard bezel included: No
• Steering wheel included: No
• Engine connection kit included: No
• Engine tie bar included: No
• Current published helm dimensions: Not stated
• Current published steering-wheel turns: Not stated
• Current published maximum wheel diameter: Not stated
• Current published cable travel: Not stated
• Current published maximum steering load: Not stated

What Is the Multiflex H1.2 Used For?

The H1.2 is the dashboard-mounted gearbox at the centre of a compatible twin-cable mechanical steering system. Turning the steering wheel rotates the helm shaft and internal planetary gear mechanism, which moves two steering cables. The cable output ends then transfer the helm movement to a correctly specified engine, tiller, rudder or steering linkage.

The H1.2 can form part of a correctly specified:

• Twin-engine mechanical steering system
• Multiflex MS1.2 packaged steering system
• Dual-cable outboard steering installation
• Compatible inboard mechanical steering installation
• Compatible power-assisted sterndrive installation
• Replacement of an existing H1.2 helm
• Replacement of a dimensionally and mechanically compatible dual-cable helm
• New installation using two matched SC-16 steering cables
• Installation where a planetary helm is required behind the dashboard
• Installation using the correct bezel and engine connection hardware

Complete suitability must be established from the vessel, engine arrangement, steering loads, cable routing and ratings of all components.

What Is Included?

• 1 x Multiflex H1.2 Planetary 300 twin-cable mechanical steering helm

The current standalone H1.2 page does not provide a complete retail packaging schedule for loose fasteners, keys, washers or helm-retaining hardware. Check the physical package before beginning installation.

Not included unless expressly stated:

• First Multiflex SC-16 steering cable
• Second Multiflex SC-16 steering cable
• B1B 90-degree bezel kit
• B2B alternative-angle bezel kit
• Steering wheel
• Steering-wheel centre cap
• Engine connection kit
• Dual-cable engine connection hardware
• Engine tie bar
• Twin-engine tie bar
• Steering link arm
• Outboard tiller connection
• Rudder arm
• Steering cable support
• Transom clamp block
• Splashwell mounting kit
• Dashboard reinforcement
• Installation-specific bolts, washers or nuts
• TH1.2 tilt helm
• Hydraulic steering components
• Autopilot interface

How Does the H1.2 Steering Helm Work?

1. The steering wheel is fitted to the 3/4-inch tapered helm shaft.
2. Turning the wheel rotates the galvanised-steel shaft.
3. The internal planetary gear mechanism transfers the rotary movement to the cable-drive assembly.
4. Two compatible steering cables are connected to the helm.
5. The cables move in response to steering-wheel rotation.
6. Their output ends transfer movement to the engine or steering linkage.
7. A correctly adjusted engine connection arrangement converts the cable movement into port or starboard steering movement.

The H1.2 is a mechanical gearbox rather than a hydraulic pump. It does not contain hydraulic fluid or operate hydraulic hoses.

How Many Steering Cables Does the H1.2 Use?

The H1.2 is configured for two steering cables.

The official MS1.2 package contains:

• 1 x H1.2 steering helm
• 2 x SC-16 steering cables
• 1 x B1B bezel kit

The two cables form part of the engineered steering arrangement and must be installed, routed and adjusted as a coordinated system. Do not operate an H1.2 installation with only one cable unless Multiflex has specifically approved that configuration.

Which Multiflex Steering Cables Are Compatible?

Multiflex pairs the H1.2 with Multiflex SC-16-XX steering cables. The XX in the part number represents the cable length in feet.

Current SC-16 product data state:

• Stainless-steel output ends
• Minimum bend radius of 8 inches
• Compliance exceeding ISO 8848/9775
• Part numbering in the format SC-16-XX
• Cable length identified in feet

These are SC-16 cable specifications, not standalone H1.2 helm specifications.

Can SeaStar SSC62 or Ultraflex M66 Cables Be Used?

Multiflex cross-references SC-16 to SeaStar / Teleflex SSC62 and Ultraflex M66. It also cross-references the H1.2 helm to Ultraflex T72FC.

Confirm the cable-to-helm connector, cable generation, adapter requirements, length, travel, output-end geometry and engine connection before fitting a cross-brand cable.

Do Both Steering Cables Need to Be the Same Length?

The official MS1.2 package is supplied with twin SC-16 cables selected by length. Both cables must follow the intended matched routing and connection arrangement.

Do not mix different cable models, connector generations, nominal lengths, output-end configurations or wear conditions unless the current Multiflex instructions approve the combination.

Is the H1.2 Designed for Twin Engines?

Multiflex markets the complete MS1.2 package for twin engines up to 300HP. A twin-engine installation may additionally require engine-specific connection hardware, a mechanical tie bar, tiller connections, cable supports and sufficient clearance throughout the full steering and tilt range.

Does the 300HP Description Mean 300HP Per Engine?

The official product title does not clarify whether 300HP means combined horsepower, horsepower per engine or another configuration limit. Confirm the approved engine arrangement directly with Multiflex or the boat manufacturer before installation.

Can the H1.2 Be Used with a Single Engine?

The current H1.2 page does not publish a separate single-engine application table. Do not assign a single-engine horsepower or speed rating without current Multiflex approval.

Confirm the engine model, boat speed, steering requirement, dual-cable connection kit, propeller torque, full travel and complete-system rating before considering a single-engine installation.

Is Twin-Cable Steering the Same as Dual-Station Steering?

No. Twin-cable steering uses one helm and two steering cables. Dual-station steering uses two separate steering positions. The H1.2’s two cable connections do not make it a dual-station helm.

Which Bezel Is Used with the H1.2?

The official MS1.2 package includes a Multiflex B1B bezel. Multiflex cross-references B1B to SeaStar SB27484P and Ultraflex X34. B2B is separately cross-referenced to SeaStar SB27483P and Ultraflex X35.

The standalone H1.2 does not include a bezel unless the seller specifically states otherwise.

Which Steering Wheels Are Compatible?

The H1.2 has a standard 3/4-inch tapered steering-wheel shaft. A compatible marine wheel must match the taper, keyway, hub depth and dashboard clearance.

The current H1.2 product page does not publish a maximum steering-wheel diameter.

Does the H1.2 Include a Steering Wheel?

No steering wheel is identified as part of the standalone H1.2 or the official MS1.2 package. The wheel, centre cap and installation-specific hardware are supplied separately unless expressly included.

Is the H1.2 a Non-Reaction or No-Feedback Helm?

The current H1.2 page does not describe the helm as non-reaction, no-feedback, zero-torque, anti-feedback or non-reversible.

Multiflex lists the H1N as its separate Planetary 150 non-reaction helm. Do not assign the H1N mechanism to the H1.2.

How Does the H1.2 Differ From the Multiflex H1?

Multiflex H1:

• Planetary 150 model
• Single-cable helm
• Used in the MS1 package
• MS1 package listed for engines up to 150HP
• One SC-16 cable

Multiflex H1.2:

• Planetary 300 model
• Twin-cable helm
• Used in the MS1.2 package
• MS1.2 listed for twin engines up to 300HP
• Two SC-16 cables

Can H1 Technical Specifications Be Applied to the H1.2?

No. The H1 manual publishes H1-specific figures including approximately 4.3 wheel turns, a 406mm maximum wheel diameter, a 127.5mm shaft, 228mm travel and a 5000N tiller-end load.

Those values are identified for the single-cable H1 and must not be assigned to the H1.2 without current manufacturer confirmation.

How Does the H1.2 Differ From the TH1.2?

H1.2: Standard fixed-shaft helm used in the MS1.2 package.

TH1.2: Separate tilt helm used in the TMS1.2 package.

Confirm the dashboard, bezel and steering-wheel mounting requirements for the selected version.

Is the Ultraflex T72FC a Direct Equivalent?

Multiflex officially cross-references H1.2 to Ultraflex T72FC. It also cross-references SC-16 to M66, B1B to X34 and B2B to X35.

Ultraflex publishes approximately 3.8 turns, 228mm cable stroke, a 406mm maximum wheel diameter and a 200mm bend radius for the T72FC/M66 system. These are Ultraflex specifications and must not be transferred to the H1.2 without confirmation.

Does Multiflex Publish a SeaStar / Teleflex Helm Equivalent?

No SeaStar or Teleflex helm model is listed against the H1.2. The SC-16 cable is separately cross-referenced to SSC62, but this does not create a SeaStar helm equivalent.

What H1.2 Dimensions Are Currently Published?

The current H1.2 page does not publish:

• Overall helm dimensions
• Dashboard cutout
• Mounting-hole pattern
• Rear projection
• Shaft length
• Cable connection spacing
• Steering-wheel turns
• Maximum wheel diameter
• Maximum cable travel
• Maximum tiller-end load
• Product weight

Obtain the current H1.2 mounting template before cutting or drilling the dashboard.

What Does the Historical Multiflex Catalogue State?

An older Multiflex Easy Connect double-helm catalogue page lists approximately four steering-wheel turns, a 16-inch maximum wheel, maximum boat lengths of 9 metres outboard and 10.5 metres inboard, an aluminium-alloy cover, zinc-alloy planetary gear set, galvanised shaft, powder-coated finish and 3/4-inch taper.

The current H1.2 page does not repeat these values. Treat them as historical reference data only and verify the current product before publication or installation.

What Materials Are Used?

• Helm cover: High-pressure die-cast aluminium alloy
• Finish: Powder-coated
• Helm shaft: Galvanised steel
• Shaft profile: Standard 3/4-inch taper

The current page does not publish the alloy grade, coating thickness, galvanising specification, current gear-set material, bearing material or salt-spray test duration.

Can the H1.2 Be Used with Hydraulic Steering?

No. The H1.2 is a mechanical rotary helm and does not replace a hydraulic helm pump, cylinder, hoses, fluid reservoir, hydraulic tie bar or electronic steering system.

Does the H1.2 Include an Engine Connection Kit?

No engine connection kit is identified as included. Depending on the vessel, a dual-cable outboard connection kit, tiller link, twin-engine tie bar, support tube, transom support, rudder connection or sterndrive-specific adapter may be required.

Construction and Design

• Multiflex Planetary 300 mechanical steering helm
• Model H1.2
• Compact rotary planetary design
• Twin-cable configuration
• Two steering-cable connections
• Designed for one steering station
• Used in the Multiflex MS1.2 package
• MS1.2 supplied with two SC-16 cables
• MS1.2 supplied with a B1B bezel
• MS1.2 described for twin engines up to 300HP
• High-pressure die-cast aluminium-alloy helm cover
• Powder-coated finish
• Galvanised-steel steering-wheel shaft
• Standard 3/4-inch tapered shaft
• Fixed-shaft helm
• TH1.2 available as a separate tilt version
• H1N available as a separate non-reaction model
• Officially cross-referenced to Ultraflex T72FC
• No SeaStar / Teleflex helm equivalent published
• SC-16 cross-referenced to SSC62 and M66
• Steering cables supplied separately
• Dashboard bezel supplied separately
• Steering wheel supplied separately
• Engine connection hardware supplied separately
• Current dimensions and load ratings not published

Installation and Safety

• Confirm that the product is H1.2
• Verify that a twin-cable mechanical system is required
• Check the boat and engine steering requirements
• Do not expand the published 300HP wording without confirmation
• Select two compatible SC-16 steering cables
• Measure cable length using the current Multiflex method
• Do not mix incompatible cable models or connectors
• Confirm the bezel and mounting angle
• Obtain the current H1.2 mounting template
• Check dashboard strength and rear clearance
• Fit a compatible wheel to the 3/4-inch taper
• Connect and positively retain both cables
• Route both cables in smooth curves
• Maintain at least the SC-16 minimum 8-inch bend radius
• Keep the cables clear of heat, sharp edges and moving machinery
• Secure the stationary cable casings correctly
• Use an approved engine connection kit
• Adjust the dual-cable connection so both cables share the load correctly
• Confirm full port-to-starboard movement
• Ensure neither cable bottoms out
• Test outboard steering throughout the complete tilt range
• Check clearance from the transom, splashwell and tie bar
• Confirm the correct steering direction
• Recheck all fasteners after initial operation
• Inspect both cables regularly
• Do not operate the vessel if the steering binds or develops excessive play
• Do not exceed the rating of the lowest-rated system component

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

Key Features

• Multiflex H1.2 Planetary 300 steering helm
• Compact mechanical rotary design
• Twin-cable helm configuration
• Officially paired with two SC-16 cables
• Used in the Multiflex MS1.2 package
• MS1.2 described for twin engines up to 300HP
• Planetary gear mechanism
• Easy connection and quick installation
• High-pressure die-cast aluminium-alloy cover
• Powder-coated finish
• Galvanised-steel shaft
• Standard 3/4-inch tapered shaft
• B1B bezel used in the official package
• SC-16 cables have stainless-steel output ends
• SC-16 minimum bend radius is 8 inches
• SC-16 exceeds ISO 8848/9775
• Cross-referenced to Ultraflex T72FC
• SC-16 cross-referenced to SSC62 and M66
• No SeaStar / Teleflex helm equivalent published
• Not identified as a non-reaction helm
• TH1.2 is the separate tilt version
• Steering cables supplied separately
• Bezel supplied separately
• Steering wheel supplied separately
• Engine connection hardware supplied separately
• Current dimensions, turns, travel and load not published
• Complete system compatibility must be confirmed before ordering