Ultraflex L121 Brass Cable End Pivot Pin For 33C Control Cables

The Ultraflex L121 / 4-L121 Control Cable Pivot is a brass cable-end fitting for compatible C0, C2, C8 and universal 33C / 3300 engine control cables. Its 10-32 UNF female thread screws onto the cable’s moving threaded rod, while the 6.4mm spindle connects the cable to a throttle, gearbox or other mechanical operating lever approximately 3mm thick.

The pivot allows the cable end to articulate as the operating lever moves through its arc, helping maintain correct alignment throughout the cable’s push-pull stroke. It is supplied with a split pin and is sold as a single cable-end fitting.

Product data clarification: The L121 is the Ultraflex pivot for an approximately 3mm-thick operating lever. The separate L12 performs the same general function but is designed for a thicker lever of up to approximately 6mm.

Product Identification

• Brand: Ultraflex
• Model: L121
• Product code: 4-L121
• Product category: Engine control cable end fitting
• Alternative descriptions: Cable-end pivot, throttle cable pivot or gearbox cable pivot
• Material: Brass
• Cable-end thread: 10-32 UNF female
• Alternative thread description: 3/16in UNF
• Spindle diameter: 6.4mm
• Specified lever thickness: Approximately 3mm
• Cable format: Universal 3300 / 33C
• Published Ultraflex cable compatibility: C0, C2 and C8
• Additional supplier-listed compatibility: Compatible C33 / 33C cables
• Cable capacity: One control cable
• Connection type: Threaded pivot body with transverse spindle
• Pin retainer: Split pin
• Primary function: Connects a moving cable rod to a mechanical control lever
• Typical applications: Gear shift, throttle and compatible push-pull controls
• Control cable: Supplied separately
• Cable outer clamp: Supplied separately
• Maximum working load: Not published

What Is the Ultraflex L121 Used For?

The L121 forms the articulated connection between the moving threaded rod of a mechanical engine control cable and the lever operated by that cable.

It can form part of a correctly specified:

• Gear-shift control installation
• Throttle-control installation
• Inboard engine control system
• Outboard engine control system
• Sterndrive control installation
• Gearbox selector connection
• Choke or engine-stop control using a compatible cable
• Replacement C0 cable installation
• Replacement C2 cable installation
• Replacement C8 cable installation
• Compatible universal 33C / 3300 cable installation

When the remote control is operated, the control cable rod pushes or pulls the L121. The spindle transfers this movement to the connected lever while allowing the pivot body to follow the lever’s changing angle.

What Is Included?

• 1 x Ultraflex L121 / 4-L121 brass cable-end pivot
• 1 x 6.4mm pivot spindle
• 1 x split pin

The L121 is sold individually. Washers, spacers and cable locknuts are not consistently identified as included and should be checked against the supplied package.

Not included unless expressly stated:

• Ultraflex C0 control cable
• Ultraflex C2 control cable
• Ultraflex C8 control cable
• MACHZero control cable
• Remote control lever or control box
• Engine throttle lever
• Gearbox selector lever
• Cable outer-casing clamp
• Structural support bracket
• Cable locknut
• Clevis
• Ball joint
• A second cable pivot
• Other engine-specific linkage fittings

Which Control Cables Are Compatible?

• Ultraflex C0
• Ultraflex C2
• Ultraflex C8
• Compatible C33 / universal 33C control cables

The selected cable must use a compatible 10-32 UNF male threaded moving end. Cross-brand compatibility also depends on the spindle fit, lever thickness, linkage geometry and operating load.

Is the L121 Suitable for Universal 33C / 3300 Cables?

Yes. The L121 is commonly supplied as a pivot for compatible 33C / 3300-series engine control cables.

Before ordering, confirm:

• 10-32 UNF male cable-end thread
• 6.4mm pivot spindle requirement
• Operating-lever hole diameter
• Approximately 3mm lever thickness
• Required articulation
• Cable travel
• Operating load
• Available installation clearance

A matching cable-end thread alone does not guarantee complete compatibility.

Is the Ultraflex MACHZero Cable Compatible?

The published L121 product descriptions explicitly name C0, C2 and C8 but do not consistently name MACHZero.

MACHZero uses the universal 33C-style 10-32 UNF cable-end thread, but its L121 compatibility should be verified from the spindle, lever and linkage geometry before installation.

How Does the L121 Pivot Work?

1. Screw the brass L121 body onto the cable’s 10-32 UNF threaded moving rod.
2. Align the 6.4mm spindle with the hole in the operating lever.
3. Pass the spindle through the lever.
4. Secure the spindle using the supplied split pin.
5. Adjust the cable to the correct neutral, idle or rest position.
6. Check that the pivot articulates freely throughout the complete lever arc.

What Does the 3mm Lever Thickness Mean?

The L121 is designed for an operating lever approximately:

• 3mm thick
• 0.12in thick

The spindle must pass fully through the lever while leaving sufficient clearance for the split pin to be installed and retained correctly.

What Thread Does the L121 Use?

• Female thread: 10-32 UNF
• Alternative description: 3/16in UNF

The female thread screws onto the male threaded rod end of a compatible control cable.

What Is the L121 Spindle Diameter?

• Spindle diameter: 6.4mm
• Approximate imperial diameter: 0.25in

Check the physical spindle and operating-lever hole before drilling or modifying the linkage.

What Are the L121 Dimensions?

• Supplier diagram dimension A: 6.4mm
• Supplier diagram dimension B: 11.1mm
• Supplier diagram dimension C: 8.3mm
• Supplier diagram dimension D: 3.6mm
• Supplier diagram dimension E: 20mm

Dimension A corresponds with the published spindle diameter. The precise reference points for dimensions B-E should be checked against the original diagram or physical fitting where exact clearance is required.

How Does the L121 Differ From the Ultraflex L12?

Ultraflex L121 / 4-L121

• Designed for an approximately 3mm lever
• Brass construction
• 10-32 UNF female thread
• 6.4mm spindle
• Supplier diagram dimension E of 20mm
• Supplied with split pin
• Published for C0, C2 and C8 cables

Ultraflex L12 / 4-L12

• Designed for a lever up to approximately 6mm thick
• Brass construction
• 10-32 UNF female thread
• Approximately 6.3mm pivot pin
• Supplier-published overall length of approximately 26mm
• Supplied with split pin and two washers
• Published for C2, C8 and MACHZero cables

Select the L121 for a thinner 3mm lever arrangement. Select the L12 where a thicker lever and wider pin-span arrangement are required.

Does the L121 Secure the Cable Outer Casing?

No. The L121 connects the moving cable rod to the operating lever.

The stationary cable casing must be secured separately using:

• Ultraflex L14 saddle clamp
• A remote-control-box retaining arrangement
• An engine-side mounting bracket
• Another approved control cable clamp

Does the L121 Hold One or Two Control Cables?

The L121 connects one control cable to one operating lever. Separate shift and throttle cables may require one pivot for each mechanism.

Is the Control Lever Included?

No. The L121 is the cable-end pivot fitting only. The control cable, operating lever and cable-support components are supplied separately.

Is the L121 Brass?

Yes. The L121 is manufactured from brass.

The brass alloy, surface coating and formal corrosion-test specification are not published.

Can the L121 Be Used with Steering Cables?

No. The L121 is intended for mechanical engine control cables, including compatible shift and throttle cables.

It is not intended for rotary steering cables, rack-and-pinion steering cables, hydraulic steering hoses or steering link arms.

Is a Maximum Working Load Published?

No maximum working load or proof load is stated. Select the L121 according to the control cable, operating lever, engine or gearbox requirements and complete linkage geometry.

Construction and Design

• Ultraflex cable-end pivot
• Model L121
• Product code 4-L121
• Brass construction
• Designed for one mechanical control cable
• Compatible with C0
• Compatible with C2
• Compatible with C8
• Suitable for compatible C33 / 33C cables
• 10-32 UNF female cable thread
• Approximately 3mm lever thickness
• 6.4mm spindle diameter
• Split pin included
• Connects a moving cable rod to a mechanical lever
• Suitable for compatible shift or throttle controls
• Does not secure the cable outer casing
• No control cable included
• No operating lever included
• No maximum working load published

Installation and Safety

• Confirm that the product is the L121 / 4-L121
• Confirm that the cable has a 10-32 UNF male threaded rod
• Verify compatibility with C0, C2, C8 or another correctly matched 33C cable
• Confirm that the operating lever is approximately 3mm thick
• Check the lever-hole diameter against the 6.4mm spindle
• Inspect the cable rod thread for damage
• Start the brass pivot on the cable thread by hand
• Do not cross-thread the pivot
• Maintain sufficient cable-thread engagement
• Insert the spindle fully through the operating lever
• Install the split pin completely
• Ensure the pivot articulates freely
• Align the control cable to avoid side loading
• Secure the cable outer casing separately
• Maintain the cable manufacturer’s minimum bend radius
• Operate the control through its complete range
• Confirm positive gear positions where used for shifting
• Confirm that the throttle returns fully to idle
• Check that the cable rod does not bottom out or overtravel
• Inspect the pivot, spindle and split pin regularly
• Replace worn, bent, loose or damaged components
• Do not operate the control system if the pivot binds

Engine shift and throttle controls are safety-critical systems. Installation should be completed according to the current Ultraflex, engine, gearbox and remote-control instructions by a competent marine technician.

Key Features

• Ultraflex L121 control cable-end pivot
• Product code 4-L121
• Brass construction
• Compatible with Ultraflex C0 cables
• Compatible with Ultraflex C2 cables
• Compatible with Ultraflex C8 cables
• Suitable for compatible C33 / universal 33C cables
• 10-32 UNF female cable thread
• 6.4mm spindle diameter
• Designed for an approximately 3mm-thick lever
• Connects the moving cable rod to a throttle or gearbox lever
• Suitable for compatible shift and throttle installations
• Split pin included
• Sold as one pivot assembly
• L12 available for a thicker lever of up to approximately 6mm
• Does not secure the stationary cable casing
• Ultraflex L14 cable clamp may be required separately
• Control cable and operating lever supplied separately
• Maximum working load not published