Multiflex C1 / C2 / C3 Steering Cable Clamp

The Multiflex C1, C2 and C3 Clamp Mounts support a compatible mechanical steering cable where a separate bracket and aluminium support tube are required. The C1 uses plated-steel brackets and is specified for transom-mounted outboard installations, while the C2 uses plated-steel brackets for inboard mounting. The C3 uses aluminium mounting brackets and an aluminium tube.

Product Identification

• Brand: Multiflex
• Models / item codes: C1, C2 and C3
• Product category: Mechanical steering cable clamp block
• Alternative descriptions: Clamp mount, steering cable support block or steering cable support bracket
• Steering type: Mechanical cable steering
• Primary function: Supports and positions the steering cable at the engine or rudder end of the installation
• Cable capacity: One compatible mechanical steering cable
• C1 bracket material: Plated steel
• C1 tube material: Aluminium
• C1 application: Transom-mounted outboard steering installations
• C2 bracket material: Plated steel
• C2 tube material: Aluminium
• C2 application: Inboard mounting applications
• C3 bracket material: Aluminium
• C3 tube material: Aluminium
• C3 application: Not stated in the current manufacturer product data
• C1 / C2 Dometic / SeaStar cross-reference: 300614 / 16
• C1 / C2 Ultraflex cross-reference: S61 / 62
• C3 competitor cross-reference: Not stated
• Published dimensions: Not stated
• Maximum engine horsepower: Not stated
• Maximum steering load: Not stated

What Is a Steering Cable Clamp Block Used For?

A steering cable clamp block supports the stationary outer section or support tube of a compatible mechanical steering cable.

Holding the steering-cable support securely allows the inner output member to move in a push-pull direction and transfer steering movement to the engine tiller, rudder or other mechanical steering connection.

A correctly selected clamp mount can form part of:

• A transom-mounted outboard steering installation
• An inboard mechanical steering installation
• A rudder steering system
• A new mechanical steering installation
• Replacement of a compatible existing cable support
• An installation where the cable cannot be supported directly through an engine tilt tube
• An installation requiring a separate mounting bracket and support tube

The clamp block does not generate steering movement. It supports the steering cable while the helm and cable transfer the operator's steering input.

What Is Included?

This listing is for one selected Multiflex steering cable clamp-block assembly:

• Multiflex C1 clamp block
• Multiflex C2 clamp block
• Multiflex C3 clamp block

The product data describe the model-specific mounting brackets and aluminium tube as constituent parts of each assembly. Exact loose-fastener contents are not itemised by Multiflex.

Not included unless expressly stated:

• Mechanical steering cable
• Steering helm
• Steering wheel
• Dashboard bezel
• Engine steering link arm
• Rudder link arm
• Engine tilt tube
• Splashwell mounting kit
• Engine-specific tiller bracket
• Transom reinforcement
• Additional structural mounting bracket
• Installation-specific bolts, washers or nuts
• Hydraulic steering components
• Other steering-system hardware

Which Models Are Available?

Multiflex C1 Clamp Block

• Item code: C1
• Primary application: Transom-mounted steering cable support
• Engine application: Outboard installations
• Bracket material: Plated steel
• Tube material: Aluminium
• Competitor cross-reference group: Dometic / SeaStar 300614 / 16 and Ultraflex S61 / 62
• Published horsepower rating: Not stated
• Published dimensions: Not stated

The current manufacturer page describes the C1 as generally used on the transom to mount the steering cable to “low H.D. outboards”. Multiflex does not define that phrase with a horsepower, thrust or steering-load figure.

Multiflex C2 Clamp Block

• Item code: C2
• Primary application: Inboard steering-cable mounting
• Bracket material: Plated steel
• Tube material: Aluminium
• Competitor cross-reference group: Dometic / SeaStar 300614 / 16 and Ultraflex S61 / 62
• Published engine or gearbox list: Not stated
• Published dimensions: Not stated

Multiflex C3 Clamp Block

• Item code: C3
• Primary application: Not stated by the current manufacturer page
• Bracket material: Aluminium
• Tube material: Aluminium
• Competitor cross-reference: Not stated
• Published engine or steering-cable list: Not stated
• Published dimensions: Not stated

How Do the C1, C2 and C3 Differ?

Multiflex C1

• Transom-mounted outboard application
• Plated-steel brackets
• Aluminium tube
• C1/C2 competitor cross-reference group

Multiflex C2

• Inboard mounting application
• Plated-steel brackets
• Aluminium tube
• C1/C2 competitor cross-reference group

Multiflex C3

• Application not stated on the current manufacturer page
• Aluminium mounting brackets
• Aluminium tube
• No competitor cross-reference published

The manufacturer does not publish enough dimensions to establish whether the three models differ in tube length, bracket height, bracket offset, mounting-hole spacing, pivot position, cable support height, maximum angular movement or maximum steering load.

Which Clamp Block Should Be Selected?

• Select C1 for a compatible transom-mounted outboard installation where the bracket geometry and aluminium tube match.
• Select C2 for a compatible inboard mounting application.
• Select C3 only after confirming that its aluminium bracket arrangement, tube position and mounting geometry suit the installation.

Before ordering, check:

• Boat and engine configuration
• Outboard or inboard application
• Steering-cable manufacturer and model
• Steering-cable support-tube dimensions
• Existing clamp-block part number
• Existing mounting-hole positions
• Required bracket height and offset
• Distance to the engine tiller or rudder arm
• Steering-cable travel
• Full port and starboard movement
• Engine tilt movement where applicable
• Clearance from the transom, splashwell and surrounding structure

What Is the C1 Used For?

The Multiflex C1 is specified for supporting a mechanical steering cable at the transom in a compatible outboard installation.

The manufacturer describes the C1 application using the wording “low H.D. outboards” but does not provide a numerical definition. The C1 should not be assigned an engine-horsepower limit unless the complete steering-system documentation confirms one.

Before selecting the C1, confirm:

• The outboard steering arrangement requires a transom-mounted clamp block
• The cable support tube matches the C1
• The plated-steel bracket geometry suits the transom
• The steering cable can move through its complete travel
• The engine can turn fully to port and starboard
• The engine can tilt without the cable, tube or bracket binding
• The transom structure is suitable for the mounting loads

What Is the C2 Used For?

The Multiflex C2 is specified for inboard mounting applications.

It supports the steering cable where the cable must be mounted to a suitable bracket or structure within the boat and aligned with the inboard steering mechanism or rudder linkage.

The C2 uses:

• Plated-steel mounting brackets
• An aluminium support tube
• A clamp-block arrangement for the steering cable

Multiflex does not publish a specific gearbox, rudder, engine or boat-model compatibility list for the C2.

What Is the C3 Used For?

The current Multiflex C3 product data confirm that the C3 is a steering-cable clamp block manufactured with aluminium mounting brackets and an aluminium tube.

The manufacturer does not state a dedicated outboard, inboard, transom or below-deck application. It also does not publish a direct competitor cross-reference.

The C3 should therefore be selected only after confirming:

• The required mounting application
• The steering-cable support dimensions
• The bracket geometry
• The mounting-hole positions
• The cable travel and articulation
• The structural mounting requirements
• Compatibility with the engine or rudder linkage

Which Dometic / SeaStar Parts Cross-Reference to the C1 and C2?

Multiflex publishes the C1 and C2 clamp blocks together against:

• Dometic / SeaStar 300614 / 16

This published format is generally read as references 300614 and 300616, but Multiflex does not state which individual reference corresponds to C1 and which corresponds to C2.

Before replacing a Dometic or SeaStar assembly, compare:

• Complete part number
• Mounting application
• Bracket height
• Tube length
• Pivot position
• Mounting-hole spacing
• Steering-cable fit
• Connection geometry
• Available steering travel

Which Ultraflex Parts Cross-Reference to the C1 and C2?

Multiflex publishes the C1 and C2 together against:

• Ultraflex S61
• Ultraflex S62

The manufacturer does not provide a model-by-model statement showing which C1 or C2 model corresponds to each individual Ultraflex reference.

Does the C3 Cross-Reference to 300614, 300616, S61 or S62?

No C3 competitor cross-reference is stated on the current Multiflex product page.

Do not list the C3 as a direct replacement for:

• Dometic / SeaStar 300614
• Dometic / SeaStar 300616
• Ultraflex S61
• Ultraflex S62

unless the physical dimensions and installation geometry have been separately confirmed.

Do the Cross-References Guarantee Direct Fitment?

No. Multiflex states that its cross-reference information is supplied for reference and that users must confirm interchangeability before installation.

Correct interchangeability depends on:

• Mounting application
• Steering-cable construction
• Tube diameter
• Tube length
• Clamp geometry
• Bracket height
• Bracket offset
• Fixing-hole positions
• Steering travel
• Engine or rudder connection
• Required articulation
• Installation clearances

Which Steering Cables Are Compatible?

The current C1, C2 and C3 product data do not identify a specific Multiflex steering-cable model.

The selected steering cable must have a support-tube and output arrangement that fits the chosen clamp block correctly.

Before installation, confirm:

• Steering-cable make
• Steering-cable model
• Cable output-end design
• Support-tube outside diameter
• Support-tube length
• Cable stroke
• Minimum bend radius
• Required mounting angle
• Engine or rudder linkage
• Cable condition

Are These Clamp Blocks for Steering Cables or Engine Control Cables?

The C1, C2 and C3 are steering cable clamp blocks.

They are not identified for:

• Throttle control cables
• Gear-shift control cables
• 33C engine control cables
• Multiflex EC-133 control cables
• Multiflex EEC-133 control cables
• Engine-stop cables
• Industrial push-pull controls

Can the Clamp Blocks Be Used with Hydraulic Steering?

The C1, C2 and C3 are listed as mechanical steering accessories and are designed to support a mechanical steering cable.

They are not hydraulic components and do not replace:

• Hydraulic steering cylinder
• Hydraulic cylinder mounting foot
• Hydraulic hose
• Hydraulic helm pump
• Bleeder fitting
• Hydraulic tie bar
• Hydraulic engine bracket

Does a Clamp Block Replace an Engine Tilt Tube?

A clamp block can support a steering cable in an installation where a separate support arrangement is required.

It should not automatically be described as a universal replacement for every engine tilt-tube installation.

Correct selection depends on whether the steering system uses:

• Direct engine tilt-tube mounting
• Transom clamp-block mounting
• Splashwell mounting
• Inboard bracket mounting
• Rudder linkage mounting
• Another manufacturer-approved support arrangement

Does a Clamp Block Replace a Link Arm?

No. The clamp block supports the steering cable.

A link arm performs a different function by connecting the moving end of the steering cable to an outboard engine tiller, rudder arm or another steering linkage.

A complete installation may require both a clamp block and a compatible steering link arm.

Are C1, C2 and C3 Described as Long, Short and Regular?

Some supplier listings describe the range as:

• C1: Long
• C2: Short
• C3: Regular

These are supplier catalogue descriptions. Current Multiflex manufacturer pages do not publish dimensional definitions for the terms long, short or regular.

What Are the Clamp Block Dimensions?

The current manufacturer product data do not publish:

• Overall bracket length
• Overall bracket width
• Overall bracket height
• Aluminium tube length
• Aluminium tube outside diameter
• Aluminium tube inside diameter
• Mounting-hole diameter
• Mounting-hole centres
• Ball-post height
• Steering-cable clamp diameter
• Maximum articulation angle

Where exact dimensions are required, check the physical clamp block, existing installation or a current Multiflex technical drawing.

What Is the Difference Between Plated-Steel and Aluminium Brackets?

The C1 and C2 use plated-steel brackets, while the C3 uses aluminium mounting brackets.

Multiflex does not publish:

• Steel grade
• Plating material
• Plating thickness
• Aluminium grade
• Material yield strength
• Salt-spray test duration
• Maximum corrosion rating
• Maximum bracket load
• Weight comparison

The product descriptions should therefore remain limited to plated-steel brackets for C1 and C2, aluminium brackets for C3 and an aluminium tube on all three models.

Construction and Design

• Multiflex mechanical steering cable clamp mounts
• Models C1, C2 and C3
• Designed to support one compatible steering cable
• Aluminium support tube on all three models
• Plated-steel brackets on C1
• Plated-steel brackets on C2
• Aluminium mounting brackets on C3
• C1 specified for transom-mounted outboard installations
• C2 specified for inboard mounting applications
• C3 application not stated on the current manufacturer page
• C1 and C2 included in a shared competitor cross-reference group
• No C3 competitor cross-reference published
• No hydraulic components
• No electrical components
• No steering cable included
• No steering helm included
• No link arm included
• Exact loose-fastener contents not itemised
• Dimensions not published
• Material grades not published
• Maximum steering load not published
• Maximum engine horsepower not published

Installation and Safety

Before installing a Multiflex C1, C2 or C3 clamp block:

• Confirm the required outboard, inboard or other mounting application
• Verify the exact clamp-block model
• Confirm compatibility with the steering cable
• Check the cable support-tube dimensions
• Compare the existing bracket geometry
• Mount the clamp block to a rigid structural support
• Do not attach the block to an unsupported or flexible panel
• Use corrosion-resistant mounting fasteners suitable for the structure
• Align the steering cable with the engine tiller or rudder linkage
• Avoid forcing the steering cable sideways
• Avoid sharp cable bends
• Maintain the steering cable's specified minimum bend radius
• Position the cable so its full travel remains available
• Confirm that the cable output does not bind
• Ensure the aluminium support tube is retained securely
• Confirm that the bracket does not flex during steering operation
• Turn the steering fully from port to starboard
• Check clearance at both steering locks
• For outboard installations, tilt the engine fully upward and downward
• Repeat the steering-clearance check throughout the tilt range
• Confirm that the cable does not contact the transom or splashwell
• Ensure the engine or rudder is not forced against its mechanical stop
• Recheck all mounting fasteners after the initial steering test
• Inspect plated-steel parts for coating damage and corrosion
• Inspect aluminium components for deformation or cracking
• Replace any loose, bent, cracked or excessively corroded component
• Do not operate the boat if the cable or clamp block binds
• Do not exceed the rating of the lowest-rated component in the steering system

Marine steering is safety-critical. Installation should be completed according to the current Multiflex, steering-cable, engine and boat instructions by a competent marine technician.

Key Features

• Multiflex C1, C2 and C3 steering cable clamp blocks
• Designed for compatible mechanical steering systems
• Supports and positions the steering cable
• C1 specified for transom-mounted outboard applications
• C2 specified for inboard mounting applications
• C3 supplied with aluminium mounting brackets
• C1 uses plated-steel brackets
• C2 uses plated-steel brackets
• All three models use an aluminium tube
• C1 and C2 cross-referenced collectively to Dometic / SeaStar 300614 / 16
• C1 and C2 cross-referenced collectively to Ultraflex S61 / 62
• Cross-references require fitment verification
• No C3 competitor cross-reference published
• C1 manufacturer wording does not provide a numerical engine rating
• Steering cable supplied separately
• Steering helm supplied separately
• Steering wheel supplied separately
• Link arm supplied separately
• Hydraulic components supplied separately
• Exact mounting fastener contents not itemised
• Dimensions not published
• Steel plating specification not published
• Aluminium grade not published
• Maximum steering load not published
• Correct mounting geometry must be confirmed before ordering