• Ronstan Series 40 Ball Bearing Upright Lead Block
1 1
1 product view Open images for a closer look Compare photos with product details

Ronstan

Ronstan Series 40 Ball Bearing Upright Lead Block

Ronstan Series 40 Ball Bearing Upright Lead Block

SKUCT-106467

$56.90
$56.90
Sale Sold out
Shipping calculated at checkout.
Shipping rewards at $100 U.S. orders of $100 or more get free standard shipping, plus $10 off Expedited and Overnight.

Low stock

Use the Tug & Tow SKUInclude this SKU when you contact us about fit, availability, or reorders.
Delivery shown at checkoutShipping options, final costs, and delivery estimates appear before payment.
Check fit before orderingReview dimensions, part numbers, model details, and compatibility notes.
Confirm the details before checkoutFit can depend on your boat, RV, trailer, vehicle, or equipment. Contact us before ordering if compatibility is critical.Ask a product question

Product details

Review the details before ordering.

Restore optimal sail control and minimize friction with the Ronstan Series 40 Ball Bearing Block. Designed as a low-profile solution for leading halyards and other rig controls back to cleats or jammers, this block ensures smooth operation even under heavy loads. Its robust construction, including a Grade 316 stainless steel load housing, guarantees reliability in demanding marine environments. Upgrade your rigging today for superior performance and durability.

  • Acetal/Torlon Ball Bearings: Provides high-performance, low-friction operation for smooth sail control.
  • 2-Stage Ball Bearing System: Ensures consistent, reliable performance across the full load range.
  • UV Stabilized Acetal Sheave: Offers excellent durability and resistance to degradation from sun exposure.
  • Grade 316 Stainless Steel Load Housing: Delivers superior strength and corrosion resistance for longevity in marine conditions.
  • Maximum Rope Diameter: Compatible with ropes up to 3/8 inch (10 mm).
  • Working Load Limit (MWL): Safely handles loads up to 770 lbs (350 kg).
  • Breaking Load (BL): Rated for a substantial breaking load of 2200 lbs (1000 kg).
  • Sheave Diameter: 1 9/16 inches (40 mm) for efficient rope guidance.
  • Lightweight Design: Weighs only 2.1 oz (60 g) for minimal impact on rigging.
  • Fastener Compatibility: Accommodates fasteners up to 3/16 inch (5 mm).

Ideal Application: Typically used for halyards at the mast base, providing efficient control lead.

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.

View full details