U.S. Customers: Orders shipped from Canada may be subject to U.S. import duties, taxes, and/or tariffs as assessed by U.S. Customs and your carrier. These charges are not included in our product prices or shipping rates. You are responsible for any duties/tariffs/fees due on delivery or prior to delivery.
Canadian Based. Customer Focused.

Premium Marine Quality Parts

Ronstan

Ronstan Series 20 Ball Bearing Block - Upright Lead

LSN 55137 MPN RF20171 UPC 9316800255597 MFR Ronstan
Special Order
BC, Warehouse

"Special Order" items will take longer to process and ship then "Express" items.
Typically takes no more then 14 days for delivery.

For next day parts. Visit our express parts catalog Here.
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Series 20 Ball Bearing Block - Upright Lead

Features:
  • 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 stainless steel or Torlon® ball bearings provide high performance & low friction


Applications:
  • Typically used for halyards at the mast base


Materials:
  • U.V. Stabilized Acetal sheaves
  • Stainless steel ball bearings & Load housing


Specifications:
Sheave Ø: 20mm(3/4")
Max. Rope Ø: 6mm(1/4")
Fastener Ø: 4mm(5/32")
M.W.L.: 250kg(550lbs)
B. L.: 550kg(1,210lbs)
Weight: 18g(0.6oz)
Northern Marine Canada
Proudly Canadian Owned & Operated!
Serving customers across Canada & the USA with marine parts and accessories.
Canadian Head Office:
Kingston, Ontario, Canada
Warehouse Locations:
Toronto, Ontario, Canada
New Jersey, USA
Florida, USA

About Us

Northern Marine is a Canadian supplier of premium marine and RV parts and accessories from top industry brands. We focus on quality, accurate listings, and dependable fulfillment so you can maintain, repair, and outfit your boat or RV with confidence.

Our goal is simple: get you the right parts, shipped fast, with straightforward service you can count on.