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RONSTAN Series 40 All-Purpose Blocks

Much stronger than other same-size blocks and much more compact than other blocks handling the same loads. “Smart” features include a unique captive lock universal head fitting and an adjustable cam arm. The ball bearing blocks  feature Ronstan’s two-stage bearing system, which has exceptional low-friction performance and very high maximum working loads. Includes a unique ball bearing fiddle block. For dinghies and keelboats to 26'.

  • Sheave: UV stabilized acetal
  • Bearings: Two-stage acetal ball bearing system or plain bearing
  • Sheave Size: 1-9/16" (40mm)
  • Line Diameter: 7/16" max. (except fiddle blocks: 5/16" max.)
  • Cheek Material/Finish: Stainless and fiber-reinforced textured Zytel
  • Shackle/Strap Type: Universal head shackle. Either locks (0° or 90°) or swivels
Customer Reviews
Product Models
Description WM Model # MFG Part # Availability Price Quantity  
All-Purpose Block, Single, 882lb. SWL, 2.5oz. 271754 RF41100
In stock online.

$23.76

All-Purpose Block, Single/Becket, 882lb. SWL, 2.8oz. 271747 RF41110
In stock online.

$29.71

All-Purpose Block, Single with Becket, Loop Head, 880lb. SWL, 2.2oz. 4563557 RF41111
In stock online.

$26.27

All-Purpose Block, Stand-Up, 882lb. SWL, 2.5oz. 271739 RF41140
In stock online.

$30.56

All-Purpose Block, Cheek, Single, 882lb. SWL, 2.3oz. 271721 RF41151
In stock online.

$30.98

All-Purpose Block, Double, 1,323lb. SWL, 4.8oz. 271697 RF41202
In stock online.

$45.86

All-Purpose Block, Double/Becket, 1,323lb. SWL, 5.0oz. 271689 RF41212
Ships when available.

$50.96

All-Purpose Block, Triple, 1,543lb. SWL, 6.9oz. 271671 RF41302
In stock online.

$68.26

All-Purpose Block, Triple with Becket, 2-Axis Head, 1,540lb. SWL, 7.4oz. 4563565 RF41312
In stock online.

$75.61

All-Purpose Block, Fiddle, 882lb. SWL, 3.2oz. 271663 RF41500
In stock online.

$42.93

All-Purpose Block, Fiddle/Becket/Cam, 882lb. SWL, 5.8oz. 271648 RF41530
In stock online.

$93.67

Product Description

Much stronger than other same-size blocks and much more compact than other blocks handling the same loads. “Smart” features include a unique captive lock universal head fitting and an adjustable cam arm. The ball bearing blocks  feature Ronstan’s two-stage bearing system, which has exceptional low-friction performance and very high maximum working loads. Includes a unique ball bearing fiddle block. For dinghies and keelboats to 26'.

  • Sheave: UV stabilized acetal
  • Bearings: Two-stage acetal ball bearing system or plain bearing
  • Sheave Size: 1-9/16" (40mm)
  • Line Diameter: 7/16" max. (except fiddle blocks: 5/16" max.)
  • Cheek Material/Finish: Stainless and fiber-reinforced textured Zytel
  • Shackle/Strap Type: Universal head shackle. Either locks (0° or 90°) or swivels

Specs

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REVIEW SNAPSHOT®

by PowerReviews
RonstanSeries 40 All-Purpose Blocks
 
4.8

(based on 6 reviews)

Ratings Distribution

  • 5 Stars

     

    (5)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

83%

of respondents would recommend this to a friend.

Pros

  • Easy to install (4)
  • Easy to use (4)
  • Well built / quality (4)

Cons

No Cons

Best Uses

  • Sailing (6)

Reviewed by 6 customers

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Displaying reviews 1-6

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5.0

Great Blocks

By joe Fern

from Rochester NY

About Me Advanced

Verified Buyer

Pros

  • Attractive Design
  • Easy To Install
  • Easy To Use
  • Quality Construction

Cons

    Best Uses

    • Sailing

    Comments about Series 40 All-Purpose Blocks:

    Great attractive smooth blocks

    • Was this a gift?:
    • No
     
    5.0

    Great alternative to Harken

    By 'Mia Noi'

    from Marina Del Rey, Ca.

    About Me Advanced

    Verified Buyer

    Pros

    • Easy To Use
    • Quality Construction

    Cons

      Best Uses

      • Sailing

      Comments about Series 40 All-Purpose Blocks:

      I use the single block to run my furler line from the starboard deck into the cockpit. Cheaper than other brands but I can't see any difference in the quality. Only negative is the shackle requires a screwdriver, it has a screw head unlike other brands which can be tightened by hand.

      • Was this a gift?:
      • No

      (0 of 1 customers found this review helpful)

       
      5.0

      Suitable for the job

      By Fore"cast"

      from Kerr Lake, OK

      About Me Beginner

      Verified Buyer

      Pros

      • Easy To Install
      • Quality Construction

      Cons

        Best Uses

        • Sailing

        Comments about Ronstan All-purpose Block, Fiddle, 882lb. Swl, 3.2oz.:

        Actually bought the wrong size, so can't comment at this time.

         
        5.0

        Great compact pulley

        By Chris

        from New Mexico

        About Me Beginner

        Verified Buyer

        Pros

        • Easy To Install
        • Easy To Use

        Cons

          Best Uses

          • Sailing
          • Small Boats

          Comments about Ronstan All-purpose Block, Triple With Becket, 2-axis Head, 1,540lb. Swl, 7.4oz.:

          Convenient compact pulley for it's mwl.

           
          5.0

          Good gear

          By charlie

          from Terry, MT

          About Me Casual/ Recreational

          Verified Buyer

          Pros

          • Quality Construction

          Cons

          • None

          Best Uses

          • Sailing

          Comments about Series 40 All-Purpose Blocks:

          Used for jjb halyard on small sailboat.

           
          4.0

          Good Value Item

          By Small Axe

          from Naramata, BC

          About Me Casual/ Recreational

          Verified Buyer

          Pros

          • Easy To Install
          • Easy To Use

          Cons

            Best Uses

            • Sailing
            • Small Boats

            Comments about Series 40 All-Purpose Blocks:

            If you are a recreational sailor this product strikes the right balance between quality and price. I use several of them for control lines on my 25ft. Freedom.

            Displaying reviews 1-6

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