R Pin for Power Weeder, 8mm x 50mm, Locking Pin for Tiller and Rotavator, Agricultural Farm Machinery Spare Parts, Hitch Pin Clip

R Pin 8 x 50 mm – Heavy Duty Mild Steel Retaining Clip for Agricultural and Industrial Applications

The R Pin 8 x 50 mm, also known as an R-Clip, Hair Pin Cotter, or Retaining Pin, is a highly reliable fastening component designed to securely lock shafts, rods, and rotating parts in place without the need for tools. Engineered for strength, durability, and ease of use, this R Pin is an essential small part widely used in agriculture machinery, power weeders, tillers, trailers, automotive assemblies, construction equipment, and industrial setups.

Despite its simple design, the R Pin plays a critical role in ensuring safety and operational stability of mechanical systems. The 8 mm diameter and 50 mm length make it suitable for medium to heavy-duty applications where frequent assembly and disassembly are required.

Product Overview

The R Pin 8 x 50 mm is manufactured from high-quality mild steel wire, precisely bent into a double-loop spring form. This design allows the pin to slide easily into pre-drilled holes in shafts or bolts and automatically lock into position using spring tension.

Once inserted, the curved shape prevents accidental loosening caused by vibration, movement, or load stress. At the same time, it can be removed easily by hand, making it ideal for parts that need frequent maintenance or replacement.

Key Specifications

• Product Name: R Pin / R Clip / Hair Pin Cotter

• Size: 8 mm (Diameter) x 50 mm (Length)

• Material: High-Grade Mild Steel

• Finish: Natural / Zinc Plated (as per variant)

• Type: Spring Retaining Clip

• Weight: Approx. 15–20 grams per piece

• Country of Origin: Made in India

• Reusable: Yes

• Installation: Tool-Free

• Corrosion Resistance: Moderate (Zinc variant recommended for outdoor use)

Premium Build Quality

The R Pin is made using industrial-grade mild steel, ensuring high tensile strength and long operational life. The steel wire undergoes controlled bending and shaping to maintain perfect elasticity. This ensures:

• Strong grip inside the hole

• Resistance to deformation

• Long-term performance even under repeated use

• Consistent spring tension

The optional zinc plating provides additional protection against rust and corrosion, especially important for outdoor agricultural and marine environments.

Design & Working Principle

The R Pin gets its name from its “R” shaped design. One side is straight and inserts into the hole, while the other side is curved and acts as a locking arm.

How it works:

1. Insert the straight leg into the aligned hole of shaft or bolt.

2. Push until the curved arm snaps over the outer surface.

3. The spring tension holds the pin tightly in place.

4. To remove, simply pull the curved arm outward.

This self-locking mechanism eliminates the need for nuts, washers, or tools.

Applications

1. Agricultural Machinery

The R Pin 8 x 50 mm is widely used in:

• Power weeders

• Rotary tillers

• Seed drills

• Ridger attachments

• Harrows and ploughs

• Threshers and reapers

It helps secure wheels, linkages, blades, depth adjusters, and gear rods.

2. Automotive & Trailers

Commonly used in:

• Trailer hitch assemblies

• Brake linkages

• Gear mechanisms

• Seat locking systems

• Steering rods

Its quick-release design makes it perfect for parts requiring regular inspection.

3. Industrial Equipment

Used in:

• Conveyor systems

• Material handling machines

• Packaging equipment

• Fabrication setups

• Machinery guards and covers

4. Construction & Engineering

Suitable for:

• Scaffolding systems

• Temporary joints

• Earth-moving equipment

• Tool locking pins

Advantages of R Pin 8 x 50 mm

1. Tool-Free Installation

No spanners, no bolts, no special tools. Just insert and lock.

2. Reusable Design

Unlike split pins, R pins can be reused multiple times without losing grip.

3. High Vibration Resistance

Ideal for machines that operate under constant vibration.

4. Time Saving

Reduces assembly and maintenance time drastically.

5. Cost Effective

Low-cost solution with high durability.

6. Compact and Lightweight

Easy to store, carry, and replace.

Why Choose 8 x 50 mm Size?

The 8 mm thickness ensures compatibility with most standard agricultural shafts and mechanical rods, while the 50 mm length provides enough locking surface for strong retention without excessive protrusion.

This size offers:

• Balanced strength and flexibility

• Suitable for 5 HP to 15 HP machines

• Universal replacement part

Comparison with Other Fasteners

Maintenance & Safety Tips

• Always use correct size for the hole diameter.

• Do not force into smaller holes.

• Replace if pin loses spring tension.

• For outdoor use, prefer zinc-plated variant.

• Keep spare pins in toolkit.

Packaging Options

Available in:

• Single piece

• Pack of 5

• Pack of 10

• Bulk (100 / 500 / 1000 pcs)

Ideal for:

• Retail stores

• Online sellers (Amazon, Flipkart)

• OEM manufacturers

• Agriculture spare part dealers

Quality Standards

Manufactured following standard mechanical tolerance and industrial norms, ensuring:

• Accurate dimensions

• Smooth edges (no sharp burrs)

• Uniform spring tension

• Long shelf life

Each pin is inspected for shape accuracy and strength before packaging.

Conclusion

The R Pin 8 x 50 mm may look small, but it plays a critical role in machinery safety and performance. Its robust design, ease of use, and wide compatibility make it one of the most essential fastening components in agriculture, automotive, industrial, and construction sectors.

Whether you are a farmer, mechanic, engineer, workshop owner, or e-commerce seller, this R Pin offers unmatched reliability, convenience, and value for money. Investing in quality R Pins ensures smooth operations, reduced downtime, and safer mechanical assemblies.

In short, the R Pin 8 x 50 mm is not just a pin—it is a small component with a big impact on machine efficiency and safety.