Ronstan RF40171 Series 40 Ball Bearing Block – Single Upright Lead

Series 40 Ball Bearing Block - Single Upright Lead

Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision molded Acetal sheaves running on Acetal or Torlon ball bearings provide high performance low friction. The 2-stage ball bearing system provides consistent performance over the full load range.

Applications:

• Typically used for halyards at the mast base.

Materials:

• Acetal ball bearings
• UV stabilized Acetal sheave
• Grade 316 stainless steel load housing

Ronstan RF40171 Series 40 Ball Bearing Block – Single Upright Lead provides a low-profile solution for leading halyards and other sail-control lines back to cleats or jammers. Designed for sailors, riggers, and boat owners, this Series 40 ball bearing block supports efficient line routing in applications where dependable, low-friction performance and a compact profile are important.

The precision-molded Acetal sheave runs on Acetal ball bearings to help deliver smooth line movement and high performance. Its two-stage ball bearing system is designed to provide consistent performance across the full load range, making the block well suited for sailboat rigging systems. The single upright lead configuration is typically used for halyards at the mast base, helping route control lines toward accessible deck hardware.

Key Features:

• Feature: Low-profile design: Provides a compact solution for leading halyards and other sail controls back to cleats or jammers.
• Feature: Two-stage ball bearing system: Supports consistent performance across the full load range.
• Feature: Precision-molded Acetal sheave: Promotes high-performance, low-friction line handling.
• Feature: Single upright lead configuration: Suited to typical halyard routing applications at the mast base.
• Feature: Marine-grade construction: Combines an UV-stabilized Acetal sheave with a Grade 316 stainless steel load housing.

Product Details:

• Brand: Ronstan
• Part Number: RF40171
• Product Type: Series 40 ball bearing block
• Configuration: Single upright lead
• Primary Application: Halyards at the mast base
• Sheave Material: UV-stabilized Acetal
• Bearing Material: Acetal ball bearings
• Load Housing: Grade 316 stainless steel

Choose the Ronstan RF40171 Series 40 Ball Bearing Block for streamlined halyard routing and reliable low-friction performance in sailboat rigging applications.

SEO Meta Description: Shop the Ronstan RF40171 Series 40 ball bearing block with a low-profile design, Acetal sheave, and two-stage bearings for halyard routing.

Features:

• Low-profile design for leading halyards and other sail controls back to cleats or jammers.

• Two-stage ball bearing system for consistent performance across the full load range.

• Precision-molded Acetal sheave for high-performance, low-friction line handling.

• Single upright lead configuration typically used for halyards at the mast base.

• UV-stabilized Acetal sheave and Grade 316 stainless steel load housing.