Ronstan RF1806 D Shackle 5/32" (4mm) Pin – Stainless Steel Coined Pin Shackle

The Ronstan RF1806 D Shackle (5/32" / 4mm Pin) is a compact, lightweight marine-grade stainless steel shackle designed for reliable, low-profile rigging connections.

Manufactured from Grade 316 stainless steel, the RF1806 delivers excellent corrosion resistance and durability, making it ideal for harsh marine environments and long-term use on dinghies, yachts, and trailer boats.

The 4mm (5/32") coined pin head design provides a smooth, rounded profile that reduces snagging on ropes, sails, and running rigging, while still allowing secure fastening.

Designed for performance and efficiency, this shackle offers a high strength-to-weight ratio, making it particularly well suited to lightweight sailing setups and performance applications.

Despite its small size and low weight (~5g), the RF1806 provides a breaking load of around 600kg, making it ideal for light-duty rigging and general-purpose marine connections.

The classic D (Dee) shape ensures secure inline load handling, delivering dependable performance where compact, simple connections are required.

Key Features

• Grade 316 stainless steel – corrosion-resistant marine construction
• 5/32" (4mm) coined pin – smooth, low-profile design
• Lightweight (~5g) – ideal for performance sailing
• High strength-to-weight ratio – efficient and durable
• Breaking load ~600kg – suitable for light-duty rigging
• Compact D-shackle design – secure inline load connection
• Reduced snagging risk – ideal for running rigging

Specifications

• Brand: Ronstan
• Model: RF1806
• Product Type: D (Dee) shackle
• Pin Diameter: 5/32" (4mm)
• Internal Length: ~16mm
• Internal Width: ~10mm
• Breaking Load: ~600kg
• Weight: ~5g
• Material: Grade 316 stainless steel
• Pin Type: Coined (smooth head)

Ideal Applications

• Lightweight dinghy rigging
• Control line and pulley attachments
• Soft shackle or lashing connections
• General marine hardware use
• Performance sailing setups

This shackle is ideal where you need a lightweight, compact, and corrosion-resistant connection for low-load applications.

Why Buy from Barton Marine NZ?

• Trusted NZ Ronstan hardware supplier
• Fast nationwide delivery
• Genuine marine-grade stainless fittings
• Ideal for NZ coastal and racing conditions

Pro Tip 

• Use coined pin shackles where you want minimal snagging on sheets and sails
• Ideal for high-movement areas like control lines
• Keep a range of sizes onboard for fast rigging adjustments