Quick-Release Retention for Pins, Shafts & Linkages

Small retaining hardware can determine whether a removable connection stays where it belongs. Red Cat R Clips are zinc-plated spring retaining clips for compatible pins, shafts, trailer hardware, agricultural equipment & mechanical linkages. The current range covers 2mm, 3mm, 4mm, 5mm & 6mm R Clips, giving workshop, fabrication & maintenance buyers several sizes for matching the clip to the connection.

Before selecting a replacement, inspect the pin or shaft rather than choosing an R Clip by appearance.  Measuring & Layout Tools can assist when dimensions need confirming, while  Specialty Fasteners provides related retaining hardware where the connection requires a different fastening method.

An R Clip works through its formed spring geometry. The straight leg locates into the compatible retaining point while the curved section bears against the shaft or pin. Correct selection therefore involves more than wire thickness: shaft diameter, retaining geometry, spring engagement & surrounding clearance all affect how the clip sits.

If an R Clip repeatedly spreads, bends or works loose, inspect the connection before fitting another one. A worn pin, incorrect clip size, poor engagement or contact with neighbouring components can turn a simple retaining problem into a recurring failure.

What Are Red Cat R Clips?

Red Cat R Clips are formed spring-wire fasteners used to retain compatible round shafts, clevis pins & removable mechanical connections.

Their profile resembles the letter R, which gives the clip its common name.

The straight leg engages with the retaining feature while the curved section springs around the compatible shaft or pin. This allows the clip to be fitted & removed without bending its legs apart in the way a conventional split pin is normally installed.

The current Industrial Shed collection includes:

► 2mm Red Cat R Clips, Pack of 5
► 3mm Red Cat R Clips, Pack of 5
► 4mm Red Cat R Clips, Pack of 5
► 5mm Red Cat R Clips, Pack of 5
► 6mm Red Cat R Clips, Pack of 5

The current Red Cat products are zinc plated.

Similar hardware may also be described in the Australian market as R pins, hairpin cotter pins, spring cotter pins, hitch pin clips or bridge pins.

Terminology varies, but fitment should always be determined from the actual connection.

Why Choose Red Cat R Clips?

Consider a pin that needs to come out whenever machinery is adjusted or a trailer component is serviced.

A conventional threaded fastener can make that simple task slower than necessary. A split pin may also require its legs to be bent during installation & straightened or replaced during removal.

An R Clip provides reusable quick-release retention where the equipment has been designed for this style of fastener.

Spring engagement is the key distinction.

The clip's formed section bears against the compatible shaft or pin, allowing it to remain retained without turning the connection into a permanent fastening point.

This also separates an R Clip from a Red Cat linch pin. Both are removable retaining devices, but their geometry & engagement are different. The correct choice depends on the design of the connection rather than which fastener is easiest to hand.

Common Applications

Clevis Pins

Clevis pins are one of the clearest applications for R Clip retention.

Where the pin & clip geometry are compatible, the R Clip prevents the clevis pin from withdrawing while still allowing relatively quick removal during servicing or adjustment.

Inspect both components together. A new clip does not correct a badly worn clevis pin.

Trailer & Caravan Hardware

R Clips are commonly used around compatible trailer & caravan connections where pins need to remain removable.

The connection should still be inspected for movement.

Repeated vibration, road contamination & regular coupling or adjustment can affect small retaining components over time.

Agricultural Equipment

Farm machinery frequently contains removable pins at implement, adjustment & linkage points.

An R Clip can make these connections accessible during equipment changes or maintenance.

Mud, crop material & corrosion can obscure the clip, so clean the area sufficiently to inspect spring engagement rather than simply confirming that something metallic is still attached.

Machinery Adjustment Points

Positioning mechanisms often rely on removable pins.

After changing height, angle or linkage position, confirm the R Clip has been reinstalled correctly before the machinery returns to operation.

Also check clearance in the new position. Moving a linkage can change what sits close to the retaining clip.

Workshop Fabrication

R Clips can be incorporated into fabricated assemblies where removable shafts or pins are deliberately part of the design.

Think about service access before drilling or welding the surrounding structure.

A technically correct retaining point becomes unnecessarily difficult to maintain if a bracket prevents the clip from being gripped & removed.

Maintenance Spares

R Clips are small, removable & easy to misplace during field repairs.

Keeping known replacement sizes with regularly serviced machinery can reduce the temptation to substitute wire, nails or other improvised retainers.

With the Red Cat range supplied in packs of five, matching spares can be kept with equipment that repeatedly uses the same clip size.

Product Selection Guide

The best R Clip is not simply the largest clip that can be pushed onto the connection. Start with the shaft & work outward.

Identify the Retaining System

Determine exactly what the R Clip is securing.

Common examples include:

► Clevis pins
► Trailer pins
► Round shafts
► Linkage pins
► Adjustment pins
► Removable machinery connections

If the original assembly uses a linch pin, split pin, lock nut or another retention method, do not substitute an R Clip without confirming that the connection is designed for it.

Measure the Connection

The Red Cat range covers 2mm, 3mm, 4mm, 5mm & 6mm R Clips.

These sizes describe the clip range, but correct selection should be based on the corresponding pin or shaft geometry rather than assuming the clip size equals the shaft diameter.

Where product-specific shaft compatibility is provided, use that specification rather than estimating.

Understand How the Clip Engages

Do not assess an R Clip as though it were a linch pin.

Depending on the pin or shaft design, the straight leg engages the retaining feature while the spring section bears against the shaft.

The entire profile therefore needs to suit the connection.

A clip can appear to fit at one point while still having poor spring engagement around the shaft.

Inspect the Pin or Shaft

Look for:

► Grooving
► Corrosion
► Distortion
► Damaged retaining features
► Burrs
► Excessive movement
► Previous improvised modifications

Wear in the main component can change how the R Clip sits even when the replacement clip itself is the correct size.

Check Spring Engagement

Once fitted, inspect how the formed section sits against the pin or shaft.

The clip should engage without being forced into obvious permanent distortion.

If substantial spreading is required simply to install it, stop & reassess the size or connection geometry.

Check Surrounding Clearance

A properly fitted R Clip can still fail as an installation if neighbouring hardware continually strikes it.

Look around the connection for:

► Brackets
► Linkage arms
► Guards
► Welds
► Panels
► Hydraulic components
► Adjacent fasteners

Then move the mechanism through its relevant positions where safe & appropriate.

Consider Removal Access

Quick-release hardware only remains convenient if you can reach it.

Make sure there is enough space to grip & withdraw the clip when the equipment needs servicing.

This is particularly important when designing fabricated assemblies where the retaining point can be positioned before surrounding brackets are permanently installed.

Inspect Spring Tension Before Reuse

R Clips are commonly removed & refitted.

That does not make every used clip suitable for indefinite reuse.

Replace a clip that has become permanently spread, bent, heavily corroded or otherwise distorted.

Its spring geometry is part of the retaining mechanism.

Seat the Clip Properly

Install the R Clip into its intended position rather than leaving it partially engaged.

If the clip stops unexpectedly, remove it & identify the obstruction.

Do not hammer or reshape a mismatched clip simply to make it stay in place.

Check the Connection After Movement

Operate or reposition the assembly where appropriate, then inspect the retaining point again.

This final check can reveal interference that was not obvious while the equipment was stationary.

Expert Tips

Compare a damaged R Clip with an unused one before throwing it away. Permanent spreading, polishing or bending can show how the connection has been loading the clip.

► Measure the shaft or pin arrangement rather than choosing from wire thickness alone. The complete profile determines fit.
► Check spring engagement visually. A clip hanging loosely from the retaining point deserves investigation.
► Do not confuse R Clips with linch pins. They perform related retaining jobs through different geometry.
► Look for wear on the pin itself. Replacing the inexpensive clip will not restore damaged parent hardware.
► Check clearance after every adjustment. Moving a linkage can place the retaining clip closer to another component.
► Keep known sizes with frequently serviced machinery. Correct spares reduce field improvisation.
► Clean contaminated retaining points before inspection. Grease, soil & debris can conceal corrosion or distortion.
► Avoid repeatedly reshaping a spread clip. Its spring form is part of how it retains the connection.
► Think about removal during fabrication. Leave enough hand access around the clip for future servicing.
► Investigate recurring loss. If the same connection repeatedly throws clips, look beyond the clip itself.