Please select your home edition
Edition
Upffront 2020 Foredeck Club LEADERBOARD

Ronstan SHOCK Blocks - Simple Efficient Low Friction Rings

by Phil Anniss 22 Jan 17:00 GMT
Ronstan SHOCK Blocks - simple efficient low friction rings © Kohlhoff Stuhlemmer Sailing

The name of the Ronstan SHOCK Block is derived from SHeaveless blOCK and reflects the growing trend for replacing ball bearing blocks, with "low friction rings", in a whole range of sailing system applications. Lightweight, high-load with no moving parts, Shock blocks are perfect for control lines and small purchase systems.

Made of anodised aluminium, Ronstan Shocks are available in two sizes (for lines up to 5mm and 10mm max diameters) and 3 colour options (Blue, Red and Grey). They are specifically designed for soft attachment; either spliced directly onto the end of a line, lashed or fixed in place with webbing.

The elongated attachment aperture has been designed to ensure correct alignment of the Shock to the line load, whilst the gentle overall 3D geometry is kind on the running line and forgiving to lead-angle variations.

Tech Specs

Line Min (mm)Line Max (mm)Height (mm)Width (mm)Length (mm)BL (kg)Weight (g)
Shock 5mm1.558.514.922.93502.5
Shock 10mm31014.524.836100012

Key Benefits

  • Lightweight
  • Compact
  • Cost effective
  • NO moving parts - maintenance free
  • Durable
  • Colour coded
  • Impact resistant
  • Strength to weight ratio
  • Soft attachment

Applications

  • Line deflectors
  • Purchase systems
  • In-hauls / Out-hauls / Tweakers
  • Lazy jacks
  • Dinghy Vang
  • Cunningham

Summary

It is obvious that a lot of thought and engineering has gone into creating such a simple product. If you have a dinghy, sportsboat or any yacht with small diameter control lines; armed with a handful of Ronstan Shocks, some single braid Dyneema® and bungy cord, you can transform your onboard systems!

You can view Ronstan Shocks online or if you have any questions about any deck hardware issues, please feel free to contact us at or via the Deck Hardware enquiry form.

Related Articles

Andersen's Electric Winch Range
Quality cruising with elegant, stainless steel winches that last a lifetime Andersen Winches are iconic. Often considered the benchmark for quality, Andersen's elegant, stainless steel winches take pride of place on the foredeck. Underneath the stainless steel exterior, an internal construction manufactured from aluminium bronze. Posted on 4 Mar
Dyneema lifelines for yachts
Gottifredi Maffioli Safeline Max reviewed by upffront.com Textile Dyneema lifelines are an increasingly popular choice for cruising as well as racing sailboats. They offer some clear advantages and that is why Gottifredi Maffioli has a dedicated lifeline material called Safeline Max. Posted on 1 Mar
Antal Manual Winches
Plain top and self-tailing for cruisers and racers In their product portfolio, Antal have three manual winch ranges: their Standard range, and two self-tailing models, the XT Cruise and XT Race. In this article, we will help you understand the features and benefits of these winches. Posted on 23 Feb
Save your metal, and your wallet with Tef-Gel
Non-toxic protection against aluminium and carbon corrosion It's often what you don't see that can make the biggest difference to the life of your boat and sailing systems. Tef-Gel® is a PTFE based paste with a wide range of applications all over your boat, and its uses are not limited to the marine sector. Posted on 12 Feb
Ten Reasons to Upgrade to an Electric Winch
Keep your eyes on the prize and your finger on the button Upgrading to an electric winch, or multiple electric winches, is an investment, and as with any financial investment there has to be a reasonable return. So, what are the potential returns on this increasingly popular sail boat upgrade? Posted on 4 Feb
Exploring Karver KBO Block options
Another careful look at a product range by upffront.com A mainstream range, the KBOs are extremely versatile and adaptable, with a wide range of single, double and triple blocks suitable for up to a max line diameter of 18mm. Due to the block's popularity, additional models have since been introduced. Posted on 28 Jan
Ronstan Cam Cleats
Lighter, stronger and kinder to ropes Simple, reliable and extremely versatile, Cam Cleats are a staple on boats of all sizes, either as the primary rope holding solution on dinghies, or as part of a purchase system on larger boats and yachts. Posted on 15 Jan
Harken Small Boat Furler range
From 14ft dinghy to 30ft sportsboat there's a model for you Harken have a dedicated range of furlers for dinghies and keelboats up to 30ft (3mm, 5mm and 6mm diameter forestays). These are what upffront.com would term "structural furlers", in that they are an integral part of the main forestay. Posted on 1 Jan
Harken Radial versus Performa Winches
Phil Anniss from upffront.com talks about the differences Harken have an extensive range of winches which are split into two primary ranges: Radial and Performa. In this blog we help you understand the key differences between these ranges and guide you to the right choice for you and your boat's needs. Posted on 23 Dec 2020