iMTSP Hairpin Cotter Pin / R-Pin for Mechanical Fastening
iMTSP Hairpin Cotter Pin, also known as an R-Pin, is a reusable mechanical fastener designed to secure clevis pins, axles, shafts and other removable components. Its spring-shaped construction provides a secure grip while allowing convenient installation and removal during maintenance.
Manufactured from durable metal, these cotter pins are suitable for agricultural machinery, automotive equipment, industrial assemblies, trailers and general repair work. Multiple diameter and length options are available to suit different fastening requirements.
Available Size Variants
Variant
Pin Diameter
Pin Length
Variant 1
2 mm
40 mm
Variant 2
3 mm
70 mm
Variant 3
4 mm
75 mm
Variant 4
5 mm
100 mm
Variant 5
6 mm
100 mm
Product Specifications
Specification
Details
Product Name
Hairpin Cotter Pin / R-Pin
Brand
iMTSP
Product Category
Mechanical Fastener
Material
Durable metal
Design
Spring-type hairpin design
Available Diameters
2 mm, 3 mm, 4 mm, 5 mm and 6 mm
Available Lengths
40 mm, 70 mm, 75 mm and 100 mm
Primary Use
Securing clevis pins, shafts, axles and removable mechanical parts
Pack Quantity
Confirm from the selected product pack before purchase
Key Features
Reusable hairpin-style mechanical fastener.
Spring action helps maintain a secure grip.
Allows quick installation without specialised tools.
Can be removed conveniently during servicing and maintenance.
Durable metal construction for regular mechanical use.
Available in multiple diameter and length combinations.
Suitable for agricultural, automotive, industrial and DIY applications.
Common Applications
Securing clevis pins in agricultural implements
Connecting tractor and machinery attachments
Locking axles, shafts and linkage pins
Trailer and trolley assemblies
Automotive repair and maintenance
Industrial equipment and mechanical assemblies
Workshop, fabrication and DIY projects
How to Select the Correct Size
Measure the diameter of the retaining hole or compatible pin.
Check the available clearance around the mechanical connection.
Select an R-Pin diameter that fits securely without forcing it.
Choose sufficient length to engage the pin or shaft properly.
Compare the measurements with the original fastener where possible.
Do not use an undersized or loosely fitting R-Pin.
Installation Instructions
Switch off and secure the machinery before installation.
Align the retaining hole of the clevis pin, shaft or axle.
Insert the straight leg of the R-Pin through the hole.
Push it until the curved spring section grips the pin securely.
Check that the R-Pin is fully seated before operating the equipment.
Inspect the connection periodically during regular maintenance.
Safety and Maintenance
Select the correct diameter and length for the application.
Do not modify, bend excessively or force an unsuitable pin into place.
Replace pins showing cracks, severe corrosion, deformation or loss of spring tension.
Do not use these pins for lifting or safety-critical applications unless specifically approved.
Keep hands clear of pinch points during installation and removal.
Confirm that all retaining pins are secured before operating machinery.
Store unused pins in a clean and dry location.
Frequently Asked Questions
What is a hairpin cotter pin?
A hairpin cotter pin is a reusable spring-type fastener used to retain clevis pins, axles, shafts and similar mechanical components. It is also commonly called an R-Pin.
Which sizes are available?
Available options include 2 × 40 mm, 3 × 70 mm, 4 × 75 mm, 5 × 100 mm and 6 × 100 mm.
Can it be used with agricultural machinery?
Yes. It can be used for compatible linkages, clevis pins and attachments in tractors, implements and other agricultural equipment.
Is the R-Pin reusable?
Yes, provided it remains undamaged and retains sufficient spring tension. Inspect it before every reuse.
How many pins are included in one pack?
The supplied information mentions both 50-piece and 100-piece packs. Confirm the quantity shown for the selected variant before ordering.
Disclaimer: Confirm the dimensions, load requirements, material suitability and pack quantity before purchase. Replace damaged or deformed pins and follow the equipment manufacturer’s safety instructions.
