Harken 417 16mm Single Block with Swivel

The Harken 417 16mm Single Block with Swivel is a compact, high-performance block designed for small synthetic control lines on high-tech dinghies and sailing applications. Despite its tiny 5/8" sheave diameter, this block delivers exceptional strength-to-weight ratios through Harken's unique patented bearing system.

Key Features:

• Patented bearing system with stainless steel balls in a captive, grooved race for smooth operation
• Polished 316 stainless steel top strap with integrated swivel for versatile rigging options
• Sheave diameter: 5/8" (16mm) optimized for small control lines
• Maximum line diameter: 7/32" (5mm)
• Maximum working load: 250 lbs (113 kg)
• Breaking load: 750 lbs (339 kg)
• Extremely lightweight design with outstanding strength-to-weight ratio

The swivel attachment point provides freedom of movement and prevents line twist, making this block ideal for mainsheet systems, cunninghams, outhauls, and other high-load control lines on performance sailboats. Part of Harken's renowned 16mm block series, known for reliability in demanding marine environments.