Ronstan RF681 Series 30 Utility Block Single Becket Loop 29mm

The Ronstan RF681 is a lightweight, economical 29mm utility block designed for control lines on sailboats and dinghies. This single block with becket and loop head attachment offers reliable performance for light to moderate load applications without the complexity of advanced bearing systems.

Durable Marine-Grade Construction:

• 316 stainless steel cheeks provide exceptional strength and superior corrosion resistance in harsh marine environments
• UV-stable acetal sheave resists sun damage for extended service life
• Riveted construction ensures durability and requires virtually no maintenance
• Standard bearing design offers smooth operation for control line systems

Versatile Mounting Options:

• Loop head can be secured with a shackle, lashed to an eye strap, or spliced directly to a line
• Hollow rivets allow mounting with screws or fasteners
• Becket rivet provides additional purchase options for multi-part purchase systems

Ideal Applications:

• Cascade system boom vangs
• Halyard tuning systems on dinghies
• Twings and cunninghams
• General control line use on sailboats

The 29mm sheave diameter is compatible with 5/16" (8mm) line. Part of Ronstan's trusted Series 30 Utility Block range, this block delivers quality materials and reliable performance at an economical price point. Simply rinse occasionally to maintain optimal performance.