Skip to product information
1 of 1

Brand: Ronstan

Ronstan Series 20 Single Ball Bearing Cheek Mount Block, 20mm

Ronstan Series 20 Single Ball Bearing Cheek Mount Block, 20mm

Regular price $22.87
Regular price Sale price $22.87
Sale Sold out
Shipping calculated at checkout.

6 available

Quantity

The Ronstan Series 20 Single Ball Bearing Block features a low-friction design with a cheek rivet mount, suitable for various rigging applications on small sailboats. It utilizes precision-molded acetal sheaves running on stainless steel ball bearings to ensure smooth operation under both static and dynamic loads.

  • Sheave diameter: 20mm (3/4")
  • Maximum rope diameter: 6mm (1/4")
  • Maximum working load: 200kg (440 lbs)
  • Breaking load: 550kg (1,210 lbs)
  • Weight: 17g (0.6 oz)
  • Mounting: Designed for screw or pop rivet installation
  • Materials: UV-stabilized acetal sheaves, stainless steel ball bearings, grade 316 stainless steel load strap/head fitting, and UV-resistant fiber-reinforced nylon cheeks

This block is intended for use with dinghy control lines, vangs, cunninghams, and traveller controls. Its lightweight construction is optimized for performance rigging.

Product facts

CT SKU
CT-103684
Model / MPN
RF20151A
UPC / GTIN
9316800262007
Package dimensions
1" X 2" X 3"
Package weight
0.05 lb

Fit-sensitive item: confirm measurements, model numbers, and manufacturer details before ordering. Tug & Tow does not guarantee universal compatibility from a product page alone.

Shipping & returns

Shipping methods, delivery estimates, and final costs appear at checkout before payment. Some bulky, supplier-shipped, or special-handling items may ship separately. See Shipping & Returns for return windows and eligibility.

Fit & compatibility

Review the product title, description, images, dimensions, part numbers, and manufacturer details before purchase. For fit-sensitive items, confirm compatibility with your boat, RV, trailer, vehicle, or equipment.

Need help choosing?

Send us the product link or SKU, plus details about your boat, RV, trailer, vehicle, or project. We will help you narrow down the right option when product fit is not obvious.