Split Pins

Whether securing castle nuts on wheel hubs or locking tie rod ends into place, Repco carry the right split pin for whatever you are fastening. Your local Repco store stocks a comprehensive selection of cotter pins from trusted brands including Champion Fasteners and GJ Works, making it easy to maintain a well-equipped workshop. Avoid bending old or rusted spilt pins back into shape when you can install new, quality split pins from Repco’s range.

Understanding Split Pins and Cotter Pins

Split pins, also referred to as cotter pins, are simple mechanical fasteners designed to secure components in place. You may also see them written as splitpin, spilt pin, slip pin, or split cotter pin. Regardless of spelling, they perform the same task. These are pins that split at the back once installed, forming a positive mechanical lock.

In automotive applications, split pins are commonly used wherever a castellated nut or drilled fastener requires a secondary locking method. Their purpose is straightforward: once the nut is torqued to specification, the split pin passes through the aligned hole and prevents the nut from rotating loose.

Repco’s range of split pins includes multiple diameters and lengths suited to steering, suspension, brake, driveline, and general mechanical work.

Design and Material Options

A split pin is manufactured from a single piece of formed wire, bent into a U-shape with two prongs. The looped end forms the head, while the twin legs pass through the drilled hole in a bolt, shaft, or split pin bolt application. Once inserted, the legs are bent outward to lock the assembly.

Material choice is important. Repco stock:

• Steel split pins for general workshop and automotive use
• Stainless steel split pins for corrosion resistance
• Split pins stainless steel variants for high-moisture environments
• Small split pins for lighter-duty or fine-thread applications
• Stainless split pins suited to marine or trailer use

Steel split pins provide strength and are suitable for most underbody and chassis applications. Split pin stainless options resist corrosion where exposure to water, mud, or road contaminants is likely. Choosing the correct material ensures long-term reliability and easier servicing in the future.

Common Automotive Applications

Split pins are widely used in automotive servicing and repairs. You will encounter cotter pins in:

• Wheel bearing hub assemblies using castellated nuts
• Tie rod ends secured with castle nuts
• Ball joints in suspension systems
• Brake pedal and clutch linkage pivots
• Clevis pins in mechanical linkages

These applications rely on vibration resistance and mechanical security. Steering and suspension components are constantly subjected to load changes and road shock. A correctly installed split cotter pin ensures that even if torque reduces slightly over time, the fastener remains mechanically locked.

Repco’s range of split pins supports both routine maintenance and full suspension rebuilds, giving you confidence that each reassembled component remains secure.

What are split pins and cotter pins used for?

Split pins and cotter pins are used to prevent nuts, bolts, and pivot pins from loosening. They are most often paired with castellated nuts, where the slots in the nut align with a drilled hole in the threaded shaft.

Once inserted and bent, the split pin stops rotational movement. This is especially critical in wheel hub assemblies, where a loose nut could affect bearing preload, and in tie rod ends, where secure steering linkage is essential.

Repco’s range includes both individual packs and assorted cotter pins to suit multiple vehicle types and fastening requirements.

What types of split pins are available at Repco?

Repco provide a broad selection of split pins to meet workshop demands. Options include:

• Individual packs of steel split pins in various sizes
• Stainless steel split pins for corrosion resistance
• Split pin kit assortments covering common diameters
• Cotter pin kit packs ideal for toolboxes and service vehicles
• Small split pins for precision or low-load applications

A split pin kit or cotter pin kit is practical for technicians and home mechanics who service different vehicle systems. Keeping assorted spilt pins organised ensures you are not delayed during reassembly.

How do you correctly install a split pin?

Correct installation is simple but must be done carefully to ensure proper locking.

• Tighten the castellated nut to the specified torque
• Align the slot in the nut with the drilled hole
• Insert the split pin fully until the head seats against the nut
• Bend the two legs in opposite directions using pliers
• Trim excess length if required

Bending the legs in opposite directions provides balanced retention. Leaving both legs bent the same way may reduce holding strength. Always ensure the split pin sits flush and does not interfere with rotating components.

Repco’s range of split pins is manufactured to consistent tolerances, ensuring correct fitment through standard drilled holes.

Should split pins be reused?

Split pins should not be reused once removed. When a spilt pin is straightened for removal, the metal experiences stress and deformation. Reusing it can lead to fatigue or reduced holding strength.

Given the low cost of replacement, fitting new cotter pins during every service is a practical approach. Repco stock economical packs and split pin kit assortments so you can replace them without hesitation during brake, steering, or suspension work.

When should you choose stainless steel split pins?

Stainless steel split pins are recommended when corrosion resistance is essential. Trailers, caravans, off-road vehicles, and marine equipment often operate in wet or corrosive environments.

Split pins stainless steel construction resists rust, reducing the risk of seizure or weakening over time. Stainless split pins are particularly useful for exposed underbody applications where moisture and road debris are common.

Choosing split pin stainless options from Repco’s range ensures long-term durability and easier servicing in the future.

Installation and Maintenance Advice

Before installation, confirm the diameter of the drilled hole matches the split pin size. A loose fit can allow movement, while an oversized pin may not insert fully. Inspect the hole for burrs or debris that could interfere with proper seating.

During routine servicing, visually check all split pins for corrosion, bending, or fatigue. Replace any pins showing signs of wear. Keeping spare split pins in your toolbox helps you complete repairs without delay.

Repco are your home of quality fasteners and fixings. Alongside split pins and cotter pins, Repco also supply complementary categories including clips, nuts & bolts or new rubber grommets, ensuring you have the right fastening solution for every job.