Ronstan Series 50 Ball Bearing Block - Single Loop Top - RF50101

Ronstan Series 50 Ball Bearing Block – Single Loop Top – RF50101

Upgrade your sailboat rigging with the Ronstan Series 50 Ball Bearing Block with Single Loop Top (RF50101). Designed for smooth, efficient line handling, this lightweight single-sheave block combines Ronstan's low-friction 2-stage ball bearing system with a durable loop-head configuration for dependable performance in a variety of sailing applications.

The Series 50 ball bearing system provides consistent performance throughout the block's working load range. Its low-friction design helps lines run smoothly through the sheave, reducing effort when trimming sails or adjusting control lines. Ronstan recommends Series 50 Ball Bearing Utility Blocks for applications including mainsheets, halyards, vangs, and spinnaker control lines on boats up to 10 m (33').

Built for demanding marine conditions, the RF50101 features Acetal ball bearings, a UV-stabilized Acetal sheave, a Grade 316 stainless steel load strap and head fitting, and impact- and UV-resistant fiber-reinforced nylon cheeks. Cheek cut-outs provide convenient access for bearing maintenance while helping keep overall weight to just 3.4 oz.

With a 2" sheave diameter, maximum rope diameter of 1/2", maximum working load of 1,100 lbs., and breaking load of 3,310 lbs., the RF50101 delivers an excellent combination of strength, low friction, and lightweight construction for performance-oriented sailboat rigging.

Key Features

• Low-Friction Ball Bearing System: 2-stage bearing design provides smooth, consistent performance throughout the load range

• Single Sheave Design: Versatile configuration for a variety of sailboat rigging applications

• Loop Head: Provides a simple, strong attachment configuration

• High Load Capacity: Rated for a maximum working load of 1,100 lbs.

• 3,310 lb. Breaking Load: Engineered for dependable performance under demanding loads

• 2" Sheave: Accommodates rope up to 1/2" in diameter

• Lightweight Construction: Weighs only 3.4 oz.

• Easy Maintenance: Cheek cut-outs provide convenient access to the bearings

• 316 Stainless Steel Components: Marine-grade load strap and head fitting provide strength and corrosion resistance

• UV-Resistant Construction: UV-stabilized sheave and reinforced nylon cheeks are designed for marine exposure

• Versatile Sailing Applications: Well suited for mainsheets, halyards, vangs, and spinnaker control systems

Specifications

Manufacturer: Ronstan
Series: Series 50
Manufacturer Part Number: RF50101
Block Type: Single Ball Bearing Block
Head Type: Loop Head
Sheave Diameter: 2" (50 mm)
Maximum Rope Diameter: 1/2" (12 mm)
Maximum Working Load: 1,100 lbs. (500 kg)
Breaking Load: 3,310 lbs. (1,500 kg)
Weight: 3.4 oz. (approximately 97 g)
Bearing Type: 2-Stage Ball Bearing System

Materials

Ball Bearings: Acetal
Sheave: UV-Stabilized Acetal
Load Strap & Head Fitting: Grade 316 Stainless Steel
Cheeks: Impact- and UV-Resistant Fiber-Reinforced Nylon

Recommended Applications

The Ronstan RF50101 is an excellent choice for performance cruising and racing sailboats and can be used in applications such as:

• Mainsheet systems

• Halyards

• Boom vangs

• Spinnaker control lines

• General sailboat running rigging

Manufacturer : Ronstan
Manufacturer Part No : RF50101
UPC : 9316800241118