R Pin / Clevis Pin (Connecting Pin) for Cuplock Scaffolding
The clevis pin, also commonly known as an R pin, hair pin, or connecting pin, is a critical locking fastener used in Cuplock scaffolding systems. It works alongside a spigot pin to secure vertical standards firmly, ensuring joints remain aligned and stable during construction activities.
Although compact in size, this connecting pin plays a major role in site safety. By preventing vertical movement and accidental separation, it helps maintain the structural integrity of scaffolding under load.
Key Specifications – Clevis Pin / R Pin
| Parameter | Specification |
|---|---|
| Product Name | Clevis Pin / R Pin / Connecting Pin |
| Material | Grade 8.8 Boron Steel |
| Manufacturing Process | Heat treated for superior strength |
| Standard Size | 16 mm × 100 mm |
| Finish | Electro zinc plated |
| Application | Cuplock scaffolding vertical connections |
| Reusability | Suitable for repeated site use |
| Packing | 125 pcs per bag |
| Pallet Packing | 7000 pcs per pallet |
Clevis Pin Size Chart (mm & Inch)
| Pin Diameter (mm) | Pin Length (mm) | Inch Size (Diameter × Length) | Common Use |
|---|---|---|---|
| 8 mm | 40 mm | 5/16″ × 1.5″ | Light-duty connections, brackets |
| 10 mm | 50 mm | 3/8″ × 2″ | General construction fittings |
| 12 mm | 65 mm | 1/2″ × 2.5″ | Formwork panels, braces |
| 16 mm | 75 mm | 5/8″ × 3″ | Medium scaffolding connections |
| 16 mm | 100 mm | 5/8″ × 4″ | Cuplock vertical & spigot locking |
| 20 mm | 120 mm | 3/4″ × 4.75″ | Heavy-duty scaffolding joints |
| 25 mm | 150 mm | 1″ × 6″ | Truss systems & structural frames |
Pins are typically secured using a cotter pin or hair pin (R-clip) depending on the application.
What Is a Clevis Pin Used For?
In scaffolding and formwork applications, contractors use this locking pin to:
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Secure spigot pins inside vertical standards
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Maintain alignment between stacked Cuplock verticals
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Prevent joint separation during loading and vibration
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Support safe height extensions in multi-level scaffolding
As a result, crews can assemble structures faster while reducing the risk of joint failure.
Clevis Pin Standard Size (Scaffolding)
The most commonly used size in Cuplock systems is:
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16 mm × 100 mm
This dimension fits standard verticals and spigots used across construction and industrial scaffolding setups. However, other sizes in millimeters are available for non-standard or custom requirements.
R Pin / Clevis Pin – Purpose & Function in Cuplock
In Cuplock scaffolding, the clevis pin (R Pin):
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Locks the spigot pin to the vertical standard
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Prevents accidental joint disconnection
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Maintains alignment between Cuplock standards
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Ensures rigid, stable joints in multi-level scaffolding
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Supports safe vertical height extensions
The curved hair pin / R-clip design locks automatically once inserted, reducing installation time and human error.
How the R Pin Works in Cuplock Scaffolding
First, the spigot pin slides into the vertical standard. Next, workers align the holes and insert the R-shaped pin. Once in place, the curved clip locks automatically.
Because this process requires no tools, installation stays quick and efficient. Moreover, the locking action remains secure even during repeated use and heavy site activity.
High-Strength Connecting Pin Features
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Manufactured from Grade 8.8 boron steel
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Heat treated to achieve high tensile and shear strength
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Electro zinc-plated to resist corrosion
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Easy to insert and remove on site
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Reusable across multiple projects
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Lightweight yet extremely strong
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Fully compatible with standard Cuplock spigot pins
In addition, the surface finish allows reliable performance in outdoor and wet conditions.
Benefits of Using R Pins in Scaffolding
Using a high-quality connecting pin offers several advantages. For example:
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Improves overall scaffold safety
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Reduces the risk of vertical joint failure
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Speeds up erection and dismantling
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Maintains proper vertical alignment
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Delivers long service life at low cost
Therefore, contractors and rental companies rely on these pins for repeated project use.
Where These Pins Are Commonly Used
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Cuplock vertical connections
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Multi-level scaffolding towers
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High-rise construction projects
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Industrial maintenance and shutdown work
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Infrastructure and metro developments
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Formwork and shuttering systems
Consequently, this fastening solution suits both temporary and long-term structures.
Clevis Pin Price (Scaffolding Use)
The clevis pin price depends on:
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Pin size and steel grade
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Quantity required
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Surface finish
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Domestic or export packing
For accurate pricing, contractors typically request a quotation based on project volume and delivery location. Contractors prefer this clevis pin because it allows fast, tool-free locking in Cuplock scaffolding systems.
Order Clevis Pins for Cuplock Scaffolding
For clevis pin price, bulk orders, or export inquiries, contact AMCO Exports for manufacturer-direct supply.
📞 Call / WhatsApp: +91 98888 82322
📧 Email: amcosales1@gmail.com
🌐 Website: www.amcoexports.com
Frequently Asked Questions (FAQ)
Q1: What is a clevis pin used for in scaffolding?
It locks the spigot pin into the Cuplock vertical, securing vertical joints and preventing accidental separation.
Q2: Is the clevis pin reusable?
Yes. Made from high-strength boron steel, it can be reused across multiple projects.
Q3: Is a clevis pin the same as an R pin or hair pin?
In scaffolding use, these terms are commonly used interchangeably.
Q4: Does this pin fit all Cuplock systems?
Yes. The 16×100 mm clevis pin fits standard Cuplock verticals and spigot pins
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