Ronstan RF64108A Series 60 Mast Base Block

Ronstan RF64108A Series 60 Mast Base Block

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Ronstan RF64108A Series 60 Mast Base Block, Clevis pin head. A tuned two-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads.

U.V. stabilised Acetal sheaves, Alloy cheek plates and cleat arms, high compression strength carbon black Acetal ball bearings, Grade 316 stainless steel shackle, post and hub. Grade 15-5PH stainless steel pad eye and snap shackle, fibre reinforced composite cleat and a 2205 stainless steel pin. Ideal for mainsheet, halyard and spinnaker sheet applications on boats up to 11m.


  • Class leading performance and sleek, contemporary styling.
  • Excellent dynamic and high static load performance.
  • Less than half the friction of the nearest competitor.
  • Suits attachment to 14mm (9/16”) wide mast collar post.
  • Removable 8mm (5/16”) clevis pin at head.
  • Central hub hole can be used as a becket take-off or tie-up point.
  • * Full block rated load can only be achieved with uniformly distributed load across full length of clevis pin. ie. 14mm (9/16") diameter mast collar post or 14mm (9/16") wide mast collar plate/tang.
Sheave Ø 60 mm
Max. Rope Ø 12 mm
Max. Cable Ø - mm
Pin Ø 8 mm
M.W.L. 1000* kg
B. L. 2000* kg
Weight 182 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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