Ronstan RF418 Single Wire Block Tubular Rivet Eye 1" Sheave 1/8" Max Wire

The Ronstan RF418 is a single wire block featuring a tubular rivet head attachment and a 25mm (1") Nylatron® sheave. Purpose-designed with narrow sheaves and grooves, this block delivers smooth, low-friction line management for wire and rope applications alike. The compact, lightweight design weighs just 1.4 oz (40g), making it an ideal choice for performance-conscious sailors looking to minimize added weight in their rigging.

Key Features:

• Sheave Material: Nylatron® — durable, low-friction polymer for smooth operation
• Cheek Material: Grade 316 stainless steel for superior corrosion resistance
• Sheave Diameter: 25mm (1")
• Maximum Cable Diameter: 3mm (1/8")
• Maximum Working Load (MWL): 450 kg (990 lbs)
• Breaking Load (BL): 900 kg (1,980 lbs)
• Weight: 40g (1.4 oz)
• Attachment Style: Tubular rivet head — can be fastened with screws, shackles, or lashing

Typical Applications:

• Halyards
• Vang systems
• Backstay control lines

The RF418's tubular rivet construction provides a secure, virtually maintenance-free attachment point — an occasional fresh water rinse is all that's needed to keep it performing. Built to Ronstan's exacting standards for marine-grade hardware, this wire block is a reliable, long-lasting component for dinghy and performance sailing rigging systems.