Ronstan RF453 Nylatron Sheave Box Single Upright Lead Block Flush Mount

The Ronstan RF453 is a low-profile Nylatron sheave box designed as a single upright lead block for routing halyards and sail control lines back to cleats or jammers. This flush-mount lead block offers a compact solution for dinghy spars and other sailing applications where space is at a premium.

Key Features:

• Low-profile design ideal for flush mounting on spars
• External mounting tabs can be formed to match spar contours before installation
• Can be mounted inverted for use as upright leads
• Durable Nylatron® sheave for smooth, long-lasting operation
• Grade 316 stainless steel load housing resists corrosion in marine environments

Specifications:

• Sheave Diameter: 22mm (7/8")
• Maximum Rope Diameter: 3mm (1/8")
• Maximum Cable Diameter: 3mm (1/8")
• Fastener Diameter: 5mm (3/16")
• Maximum Working Load: 160kg (350 lbs)
• Breaking Load: 350kg (700 lbs)
• Weight: 30g (1.1 oz)

This lead block is typically used in dinghy spars for controlling lines such as outhauls, cunninghams, and other sail control systems. The combination of lightweight construction and robust materials makes it an excellent choice for performance sailing applications.