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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
In stock online.

$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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