Ultraflex T91 Heavy Duty Steering Helm

The Ultraflex T91 42647S is a single-cable planetary mechanical steering helm designed for use with the Ultraflex M90 Mach steering cable. The helm has a standard 19mm / 3/4in tapered steering-wheel shaft and supports compatible steering wheels up to 406mm / 16in in diameter.

Special-order notice: The Ultraflex T91 is a non-stocked special-order product and is not available for immediate dispatch. A supplier lead time applies. Contact us before ordering for the current estimated delivery time. The M90 cable, dashboard mounting bezel, steering wheel and engine connection components are sold separately.

Product Identification

• Brand: Ultraflex
• Product range: T91 mechanical steering
• Product category: Mechanical marine steering helm
• Model: T91
• Manufacturer part number: 42647S
• Supplier catalogue code: 4-T91
• Helm type: Single-cable mechanical steering helm
• Gear mechanism: Planetary gear design
• Specified steering cable: Ultraflex M90 Mach
• Cable configuration: Single cable
• Approximate turns lock to lock: 4.2
• Steering-cable stroke: 228mm / 9in
• Maximum steering-wheel diameter: 406mm / 16in
• Steering-wheel shaft: Standard 19mm / 3/4in taper
• Mounting angle: 90° or 20°, depending on the selected bezel
• Suggested M90 cable bend radius: 200mm / 7.87in
• Minimum M90 cable bend radius: 150mm / 5.9in
• Feedback characteristic: Minimal feedback
• Closest Multiflex alternative: Multiflex H1 helm or MS1 planetary steering system

What Is the Ultraflex T91 Used For?

The Ultraflex T91 converts steering-wheel rotation into movement of an Ultraflex M90 Mach mechanical steering cable. The cable transfers this movement to the compatible engine or rudder connection fitted at the opposite end of the steering system.

It is intended for:

• New single-cable mechanical steering installations
• Replacement of an existing Ultraflex T91 helm
• High-efficiency mechanical steering systems
• Installations requiring the increased flexibility of the M90 Mach cable
• Long steering-cable routes
• Cable routes where installation clearance is restricted
• Compatible marine steering systems approved for the T91 and M90 combination
• Complete Ultraflex FOURTECH-I steering packages

The T91 is the helm component only. It does not independently determine the maximum engine horsepower or boat speed permitted for the complete steering system.

The steering cable, engine connection, steering load, hull configuration and boat manufacturer's ratings must all be considered when specifying the installation.

Special-Order Availability and Lead Time

The Ultraflex T91 42647S is a non-stocked special-order product.

This means:

• The helm is supplied to order
• It is not available for immediate dispatch
• A supplier lead time applies
• The estimated delivery date can vary according to manufacturer and distributor availability
• The current estimated lead time should be confirmed before the order is placed

Contact us before ordering so that the current supplier lead time can be checked.

The T91 helm is supplied separately from the M90 steering cable, mounting bezel, steering wheel and engine connection components. These additional parts may have different stock statuses and lead times.

The correct T91 helm should not be substituted with another helm solely because the alternative is available sooner. Compatibility with the existing cable and complete steering installation must be confirmed first.

How Does the Planetary Gear Design Work?

The T91 uses a planetary gear mechanism designed for high-efficiency mechanical steering applications.

The planetary arrangement provides:

• Distribution of steering load through the helm mechanism
• Compact installation behind the dashboard
• A centrally positioned steering-wheel shaft
• Approximately 4.2 steering-wheel turns lock to lock
• Minimal steering feedback
• Compatibility with the high-flexibility M90 Mach cable
• Smooth mechanical transfer between the steering wheel and cable

The T91 provides minimal feedback, but it is not a zero-torque or non-reaction helm. The separate Ultraflex T93ZT uses a non-reversible zero-torque mechanism.

What Is Included?

The Ultraflex T91 is supplied with:

• One Ultraflex T91 42647S planetary steering helm
• Single-cable M90-compatible helm connection
• Standard 19mm / 3/4in tapered steering-wheel shaft

Not included:

• Ultraflex M90 Mach steering cable
• Steering wheel
• Dashboard mounting bezel
• Engine connection kit
• Outboard steering link arm
• Steering-cable support
• Splashwell or transom mounting bracket
• Cable gaiter or protective boot
• Complete FOURTECH-I steering package
• Installation labour

A compatible M90 cable and mounting bezel are required to complete the helm installation.

Which Steering Cable Is Compatible?

The Ultraflex T91 is designed for the:

• Ultraflex M90 Mach high-efficiency mechanical steering cable

The M90 Mach cable provides:

• Patented fast-connect helm fitting
• Increased flexibility for long or restricted cable routes
• Stainless-steel engine-side output fitting
• Patented engine-side sealing gasket
• Corrosion-resistant construction
• Minimal feedback
• 150mm / 5.9in minimum bend radius
• 200mm / 7.87in suggested bend radius

The complete T91/M90 system has a stated steering-cable stroke of 228mm / 9in.

The Ultraflex M66 is not the specified steering cable for the T91. Do not substitute an M66, Multiflex SC-16 or another cable without confirmation that the complete helm-and-cable combination is approved.

Which Mounting Bezel Is Required?

The T91 helm is supplied without a dashboard mounting bezel. Select the required bezel according to the steering-wheel angle and finish.

• X34 / 36654B: Black bezel for 90° mounting
• X34W / 40654C: White bezel for 90° mounting
• X91 / 42850N: Chrome bezel for 90° mounting
• X90 / 42646P: Chrome bezel for 90° mounting with lock device
• X35 / 36655C: Black bezel for 20° mounting

The bezel determines the steering-wheel shaft angle relative to the dashboard.

Before ordering, confirm:

• Whether a 90° or 20° steering-wheel angle is required
• The dashboard construction and thickness
• Available clearance behind the dashboard
• Clearance around instruments and controls
• Clearance for the selected steering wheel
• Compatibility of the mounting template with the T91 helm

Do not drill the dashboard using a template intended for a different helm or bezel.

Is There a Multiflex Equivalent to the Ultraflex T91?

There is no direct manufacturer-published Multiflex equivalent to the Ultraflex T91.

The closest functional Multiflex alternative is the:

• Multiflex H1 Planetary 150 steering helm

The corresponding complete Multiflex package is the:

• Multiflex MS1 mechanical steering system

The standard MS1 system includes:

• Multiflex H1 planetary helm
• Multiflex SC-16 steering cable
• Multiflex B1B 90° mounting bezel

The Ultraflex T91 and Multiflex H1 share several general characteristics:

• Single-cable mechanical steering
• Planetary helm design
• Compact dashboard installation
• Standard 19mm / 3/4in tapered steering-wheel shaft
• Separate steering cable and dashboard bezel
• Compatibility with correctly specified marine steering installations

However, they are not direct equivalents or interchangeable helm components.

Why Is the Multiflex H1 Not a Direct T91 Replacement?

Multiflex's published cross-reference identifies:

• Multiflex H1: Equivalent to Ultraflex T71FC
• Multiflex SC-16: Equivalent to Ultraflex M66
• Multiflex B1B: Equivalent to Ultraflex X34

The Multiflex cross-reference does not list the Ultraflex T91 or M90 Mach cable.

Ultraflex T91 system:

• T91 planetary helm
• M90 Mach high-efficiency cable
• 150mm / 5.9in minimum cable bend radius
• 200mm / 7.87in suggested cable bend radius
• Approximately 4.2 turns lock to lock
• Separate Ultraflex 90° or 20° bezel

Multiflex H1 / MS1 system:

• H1 planetary helm
• SC-16 steering cable
• 203mm / 8in minimum cable bend radius
• B1B 90° bezel in the standard MS1 package
• Multiflex-specific cable and helm connection components

Replacing a T91 with a Multiflex H1 may require replacement of the steering helm, cable, dashboard bezel, cable-retention hardware, engine-side connection components and associated mounting components.

The Multiflex H1 or MS1 should therefore be described as the closest functional alternative, not as a direct bolt-in replacement.

Can the T91 Be Used with a Multiflex SC-16 Cable?

The Multiflex SC-16 should not be treated as a compatible T91 cable.

The SC-16 is officially cross-referenced to the Ultraflex M66 rather than the M90 Mach. The T91 is designed around the M90 cable and its fast-connect fitting.

Do not combine the T91 with an SC-16 solely because both are mechanical steering systems or their fittings appear visually similar.

For an existing T91 installation, use the specified Ultraflex M90 cable unless the complete steering system is being replaced.

How Is the T91 Different from the T71FC?

The T91 and T71FC are both single-cable Ultraflex mechanical steering helms, but they are designed around different primary steering-cable applications.

The T91 provides:

• Planetary mechanical steering design
• M90 Mach cable compatibility
• Approximately 4.2 turns lock to lock
• 228mm / 9in cable stroke
• 150mm minimum cable bend radius
• Increased suitability for long or restricted cable routes
• Minimal steering feedback

The T71FC is a separate mechanical helm commonly associated with the standard M66 cable family. The Multiflex H1 is cross-referenced to the T71FC, not the T91.

How Is the T91 Different from the T93ZT?

The T91 and T93ZT share:

• Planetary gear design
• M90 Mach cable compatibility
• Approximately 4.2 turns lock to lock
• 228mm / 9in cable stroke
• 406mm / 16in maximum steering-wheel diameter
• 90° or 20° mounting options
• Standard 3/4in tapered steering-wheel shaft

The principal difference is:

• T91: Minimal-feedback steering helm
• T93ZT: Zero-torque helm with a non-reversible mechanism

The T91 does not include the zero-torque mechanism used by the T93ZT.

Dimensions and Fitment

• Steering-wheel shaft: 19mm / 3/4in tapered
• Maximum steering-wheel diameter: 406mm / 16in
• M90 steering-cable stroke: 228mm / 9in
• Suggested cable bend radius: 200mm / 7.87in
• Minimum cable bend radius: 150mm / 5.9in
• Mounting angle: 90° or 20°
• Cable configuration: One M90 steering cable
• Dashboard bezel: Required separately

The selected bezel and its installation template determine the dashboard cut-out, mounting-hole positions, steering-wheel shaft angle and fastener positions.

Do not cut or drill the dashboard until the actual helm, bezel and installation template have been checked together.

Steering-Wheel Compatibility

The T91 has a standard 19mm / 3/4in tapered steering-wheel shaft.

It is compatible with suitable marine steering wheels where:

• The wheel has a matching 3/4in tapered hub
• The wheel diameter does not exceed 406mm / 16in
• The hub seats correctly on the shaft taper
• The shaft key engages fully
• The retaining hardware can be fitted correctly
• The wheel clears the dashboard, instruments and controls
• The wheel can rotate through the complete steering range

The steering wheel is sold separately.

Engine and Boat Compatibility

The T91 must be installed only as part of a correctly specified mechanical steering system.

Before selection, confirm:

• Boat type and hull configuration
• Engine or rudder steering load
• Maximum boat speed
• Engine power
• Number of engines
• Required engine or rudder connection
• M90 cable length
• Complete cable route
• Boat manufacturer's maximum engine rating
• Ultraflex application guidance

The T91 must not be used where the engine exceeds the maximum horsepower rating of the boat.

Ultraflex recommends hydraulic steering for boats operating above approximately 50mph.

Construction and Design

• Planetary mechanical gear design
• Single-cable configuration
• Designed for the M90 Mach cable
• Fast-connect steering-cable installation
• Compact behind-dashboard arrangement
• Centrally positioned steering-wheel shaft
• Corrosion-resistant materials
• Standard 3/4in tapered shaft
• Minimal-feedback steering
• Separate 90° and 20° bezel options
• Suitable for high-efficiency mechanical steering systems

The helm is supplied as a preassembled steering component. It should not be opened, drilled or internally modified during installation.

Installation and Use

Mechanical steering is safety-critical. Installation should be completed by a competent marine technician.

Before installation:

• Confirm the helm is an Ultraflex T91 42647S
• Confirm the product's special-order availability and supplier lead time
• Obtain the correct M90 Mach cable
• Select the required 90° or 20° bezel
• Confirm the steering-wheel diameter
• Check dashboard strength and clearance
• Confirm the required engine or rudder connection kit
• Inspect the complete cable route
• Verify that all bends meet the permitted radius
• Confirm the boat and engine remain within their ratings
• Isolate the engine starting circuit

During installation:

• Follow the instructions supplied with the helm and selected bezel
• Do not disassemble or modify the helm
• Keep dirt and foreign material away from the cable connection
• Engage the M90 fast-connect fitting completely
• Support the cable along its route
• Keep the cable clear of sharp edges
• Avoid heat, moving machinery and abrasion points
• Do not kink or crush the cable
• Do not bend the M90 cable more tightly than 150mm / 5.9in
• Use the correct engine-side connection components

After installation:

• Turn the steering wheel fully from port to starboard several times
• Confirm approximately 4.2 turns lock to lock
• Check that the engine or rudder reaches both steering limits
• Confirm the steering direction corresponds with wheel rotation
• Check that the cable does not bind
• Check that the steering wheel clears instruments and controls
• Verify engine tilt movement where applicable
• Confirm the helm, bezel and cable fasteners remain secure
• Inspect the engine-side connection
• Check for abnormal stiffness, movement or free play

Do not operate the boat if the steering is stiff, damaged, incorrectly directed or unable to reach its complete travel.

Frequently Asked Questions

Is the Ultraflex T91 held in stock?

No. The T91 is a non-stocked special-order product and is not available for immediate dispatch.

What is the lead time for the T91?

A supplier lead time applies and can vary according to availability. Contact us before ordering for the current estimated delivery time.

Does the T91 include the M90 steering cable?

No. The M90 Mach cable must be ordered separately in the correct length.

Is a dashboard mounting bezel included?

No. Select a compatible X34, X34W, X35, X90 or X91 bezel according to the required mounting angle and finish.

Is the steering wheel included?

No. The T91 accepts compatible steering wheels with a standard 3/4in tapered hub and a maximum diameter of 406mm / 16in.

Can an Ultraflex M66 cable be used?

The T91 is specified for the M90 Mach cable. The M66 should not be treated as a direct substitute.

What is the Multiflex equivalent to the T91?

There is no direct published Multiflex equivalent. The closest functional alternative is the Multiflex H1 planetary helm or complete MS1 system.

Can a Multiflex SC-16 cable be connected to the T91?

Not as a verified direct replacement. Multiflex cross-references the SC-16 to the Ultraflex M66, not the M90.

How many turns does the T91 provide?

The complete T91/M90 system provides approximately 4.2 steering-wheel turns lock to lock.

Is the T91 a non-reaction or zero-torque helm?

No. It provides minimal feedback but does not include the zero-torque mechanism used by the T93ZT.

Can the T91 be mounted at 20°?

Yes. Use the separate Ultraflex X35 black 20° mounting bezel.

Which bezels provide 90° mounting?

The X34 black, X34W white, X91 chrome and X90 chrome-with-lock bezels provide 90° mounting options.

What is the maximum steering-wheel diameter?

The maximum stated steering-wheel diameter is 406mm / 16in.

Is the T91 suitable for boats operating above 50mph?

Ultraflex recommends hydraulic steering for boats operating above approximately 50mph.

Key Features

• Ultraflex T91 planetary mechanical steering helm
• Manufacturer part number 42647S
• Supplier catalogue code 4-T91
• Non-stocked special-order product
• Not available for immediate dispatch
• Supplier lead time applies
• Current estimated delivery time should be confirmed before ordering
• Single-cable mechanical steering design
• Designed for the Ultraflex M90 Mach cable
• Approximately 4.2 turns lock to lock
• 228mm / 9in steering-cable stroke
• Planetary gear mechanism
• Minimal steering feedback
• Compact dashboard installation
• Standard 19mm / 3/4in tapered shaft
• Maximum steering-wheel diameter of 406mm / 16in
• 150mm / 5.9in minimum cable bend radius
• 200mm / 7.87in suggested cable bend radius
• Compatible 90° and 20° mounting options
• Black, white and chrome bezel choices
• M90 cable sold separately
• Mounting bezel sold separately
• Steering wheel sold separately
• Engine connection components sold separately
• No direct manufacturer-published Multiflex equivalent
• Multiflex H1 / MS1 is the closest functional alternative
• Multiflex H1 and SC-16 are not direct T91/M90 replacements
• Exceeds stated EN 28848 and ABYC P17 requirements