• Ronstan Series 40 Ball Bearing Block - Triple - Swivel Head
1 1

Brand: Ronstan

Ronstan Series 40 Triple Swivel Head Ball Bearing Block

Ronstan Series 40 Triple Swivel Head Ball Bearing Block

$91.54
$91.54
Sale Sold out
Shipping calculated at checkout.

6 available

The Ronstan Series 40 Triple Swivel Head Block features a 2-stage ball bearing system designed for consistent performance across a full load range. This high-performance block utilizes a low-friction bearing system and includes a swivel shackle head that allows for full 360-degree rotation.

Key Features:

  • Triple-sheave configuration for multi-line control
  • Swivel shackle head for 360-degree rotation
  • Low-friction Acetal or Torlon ball bearing system
  • Lightweight design with cheek cut-outs for easy bearing maintenance
  • Constructed with UV-stabilized Acetal sheaves and impact-resistant, fiber-reinforced Nylon cheeks
  • Grade 316 stainless steel load strap and head fitting for durability

Applications and Compatibility:

  • Recommended for mainsheet, halyard, vang, and spinnaker control lines
  • Suitable for off-the-beach catamarans, one-design classes, and sportsboats up to 8m (26ft)
  • Manufacturer Part Number: RF40300

Product facts

CT SKU
CT-117304
UPC / GTIN
9316800255351
Package weight
0.43 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.