Rostan RF55310 Series 55 OrbitBlock

Rostan RF55310 Series 55 OrbitBlock

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Ronstan RF55310 Series 55 Triple Orbit Block, swivel shackle head. Ultra light weight with low friction two-stage orbital ball bearing system. Highest working load in its class, low profile and compact. High performance cleating and swivel shackle head for unlimited block rotation. Stainless steel shackle head and compatibility with sharp fixing points. Ultra low profile integrated beckets.

Suitable for mainsheet systems on dinghies, sports boats and small keel boats up to 9m. Halyard, vang and backstay applications on boats up to 8m and control line applications on larger yachts.

High compression strength carbon black Acetal ball bearings and carbon fibre reinforced Nylon on two stage bearing system. Toughened glass fibre reinforced Nylon frame and cheeks, U.V. stabilised multi-strand impregnated SK75 Dyneema® Rope link. Grade 316 stainless steel head fittings.

Sheave Ø 55 mm
Max. Rope Ø 10 mm
Max. Cable Ø mm
Pin Ø 5 mm
M.W.L. 750* kg
B. L. 1500 kg
Weight g

After ordering online, you will receive an automated email confirmation containing your order details. Your order will then be confirmed within a few minutes of placing your order.

It is our policy to ensure we deliver to our customers in a timely manner. In order to achieve this we use a range of freight companies depending on the size and weight of your order. In some instances we may use a number of carriers to get your products to you. For example, chain may come by road, some electronic equipment by air.

Most orders are shipped within 2 - 5 Days

Shipping rates

Orders delivered to Australian Post Codes under $399 attract an $15.00 shipping charge.

Orders of $399 or more ship free.* Excludes Bulky Or Dangerous Goods

For Remote areas and bulky items. If the cost to send is vastly different to our standard delivery costs, someone from our team will contact you prior to dispatch to arrange further payment or to issue a refund if you are not happy with the additional charges.

International orders will be charged at $0.00 initially and our staff will be in contact with a shipping quote. If the quote is not accepted the customer reserves the right to cancel their order and be refunded in full.

Should you have any queries or concerns about shipping, please don't hesitate to get in touch by clicking the support button on bottom right of the page.

What Our Customer Say

i ordered 6 port holes and these guys found exactly what i needed and went out of there way so much to help me 5 star service .


Prompt shipping and a good price. Item was well packed and arrived as ordered and undamaged. Thanks

Tom Mercer

Good quality parts easy to order on downside a couple of delays but they were quick to call and let me know

Darcy Scholte

Good service. Parts delivered on time and in good condition. There was a bit of mix up with one of my first orders but very promptly sorted and sent our to...


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