Ultraflex M66 Heavy Duty Steering Cable

The Ultraflex M66 is a heavy-duty mechanical steering cable for compatible powerboats with outboard engines from 20 to 75HP. It features a black protective outer jacket, a stainless steel steering rod and eye, a grooved helm connection and a 7/8in-14 UNF threaded connection nut. The M66 is compatible with the listed Ultraflex, Teleflex, Multiflex and Morse mechanical steering helms.

Product Identification

• Brand: Ultraflex
• Model: M66
• Product category: Mechanical marine steering cable
• Steering system type: Heavy-duty mechanical steering
• Engine application: Outboard engines from 20 to 75HP
• Outer jacket: Black protective jacket
• Steering rod and eye: Stainless steel
• Connection nut thread: 7/8in-14 UNF
• Helm connection: Grooved connection for secure clamping
• Application: Compatible replacement or upgrade steering-cable installations

What Is This Steering Cable Used For?

The Ultraflex M66 transfers steering-wheel movement from a compatible mechanical steering helm to the boat's outboard steering assembly. It is intended for heavy-duty mechanical steering installations using an outboard engine rated from 20 to 75HP.

The M66 can be used as a replacement or upgrade cable after the helm connection, engine-side fitting and required cable length have been confirmed.

The stated engine range applies to the cable information supplied for this listing. The complete steering system, boat and engine installation must remain within the ratings specified by their respective manufacturers.

What Is Included?

The following components are integral to the Ultraflex M66 cable assembly:

• Heavy-duty mechanical steering cable
• Black protective outer jacket
• Stainless steel steering rod
• Stainless steel steering eye
• 7/8in-14 UNF threaded connection nut
• Grooved helm-end connection

No steering helm, dashboard bezel, steering wheel or additional steering-system component is identified as included in the supplied product information.

Which Steering Helms Are Compatible?

The Ultraflex M66 is listed as compatible with the following mechanical steering helms:

Ultraflex steering helms:

• T85
• T71FC
• T72FC
• T73NRFC
• T74NRFC
• T81FC
• T83NRFC

Teleflex steering helms:

• Safe-T
• TQC / NFB
• D290

Multiflex steering helms:

• H1 Planetary 150
• H1N Planetary 150 Non-Reaction
• H3 Reduction 150
• TH1 Tilt Planetary
• TH1N Tilt Non-Reaction
• TH1.2 Twin-Cable Tilt Helm – requires two matching steering cables

Other compatible helm families:

• Morse mechanical steering helms

Confirm the exact helm model, helm-side cable interface and engine-side fitting before ordering. Similar-looking mechanical steering cables are not automatically interchangeable.

What Connection Does the M66 Use?

The M66 has a 7/8in-14 UNF threaded connection nut and a grooved helm-end connection designed to be securely clamped into a compatible steering helm.

Before ordering, check:

• The existing helm is compatible with an M66 cable
• The helm accepts the grooved cable connection
• The thread requirement is 7/8in-14 UNF
• The engine-side rod and eye match the existing installation
• The selected cable has the correct overall length

Does the Ultraflex M66 Need an Adaptor?

The supplied product information does not state whether an adaptor is required for every listed steering helm.

Do not assume direct fit solely from the helm brand or product family. Confirm the exact helm model, cable-retaining arrangement and any required adaptor before installation.

Which Length Options Are Available?

The supplied product information does not state the minimum cable length, maximum cable length or available length increments for this M66 listing.

Measure the existing cable using the D + 2ft method and select the corresponding M66 length from the available product options.

How Do You Measure an M66 Replacement Steering Cable?

1. Measure the length of the black outer cable jacket marked D in the measuring diagram.
2. Do not include the exposed steering rod, steering eye, connection nut or metal end fittings.
3. Add 2ft, approximately 610mm, to the measured jacket length.
4. Select the corresponding Ultraflex M66 cable length.

Replacement cable formula: Required M66 cable length = D + 2ft.

Example: If the black outer cable jacket measures 10ft, add 2ft and select a 12ft Ultraflex M66 steering cable.

This measurement method applies when replacing an existing steering cable. A new steering installation must be measured according to the complete planned cable route through the boat.

Construction and Design

• Heavy-duty mechanical steering-cable construction
• Black protective outer jacket
• Stainless steel steering rod
• Stainless steel steering eye
• 7/8in-14 UNF threaded connection nut
• Grooved helm connection for secure clamping
• Corrosion-resistant components
• Designed for compatible 20–75HP outboard steering installations
• Suitable for replacement or upgrade applications after compatibility is confirmed

The supplied information does not state the cable stroke, minimum bend radius or compliance standards for the M66.

Installation and Use

Select the correct cable length and confirm the exact steering-helm compatibility before removing the existing cable.

During installation:

• Confirm that the outboard engine is within the stated 20–75HP range
• Verify the helm accepts the M66 grooved connection
• Confirm the required nut thread is 7/8in-14 UNF
• Inspect the cable route for obstructions, sharp turns and possible contact with moving components
• Ensure the black outer jacket is not kinked, crushed or damaged
• Check that the steering rod moves freely through the complete steering range
• Confirm that the engine reaches its required steering travel in both directions
• Secure all helm-side and engine-side connections according to the manufacturer's instructions

A minimum bend radius is not stated in the supplied information. Follow the current Ultraflex installation instructions for the selected cable length and steering system.

Marine steering is a safety-critical system. Installation and servicing should be completed in accordance with the steering-system manufacturer's instructions by suitably competent personnel.

Key Features

• Ultraflex M66 heavy-duty mechanical steering cable
• Suitable for compatible outboard engines from 20 to 75HP
• Black protective outer jacket
• Stainless steel steering rod and eye
• 7/8in-14 UNF threaded connection nut
• Grooved helm connection for secure clamping
• Corrosion-resistant components
• Compatible with specified Ultraflex steering helms
• Compatible with Safe-T, TQC/NFB and Teleflex D290 helms
• Compatible with Morse mechanical steering helms
• Suitable for replacement or upgrade installations after fitment is confirmed
• Replacement length calculated as outer jacket dimension D plus 2ft