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Ronstan Series 20 (Ball Bearing and High-Load)

Ronstan Series 20 (Ball Bearing and High-Load)

The smallest in the Ronstan Ball Bearing Block line (replacing the discontinued Series 19 Blocks), the new Ronstan Series 20 Blocks have a number of --Smart Features-- and improvements with very high maximum working loads between 440 and 880 lbs depending on the block configuration.  Sheaves are 20mm (3/4 inch) and support a max line size of 1/4 inch (6mm).  High-load (HL) blocks can handle wire to 1/8 inch in diameter. Use these blocks for almost all control line situations on small dinghies. Work well for lightly loaded control lines on larger boats as well.  Can be used for outhauls, vangs, barberhaulers, cunninghams, traveler controls, leach cords, lead car return tackles, and even flag halyards. 

Smart Features available on the configurations in this series consist of captive lock, swivel, loop, and shackle heads, ringless keyhole becket pins, quick adjusting cleat angles, and rinsing cutouts. Double and triple blocks are supplied with a shackle and have formed loop heads which can be attached directly to a line or attached to a shackle in three different ways. The cheek block sits flat on deck and is mounted with a bolt directly through the hub of the sheave for high strength.

Part # Description MWL BL
kg lbs kg lbs
RF20100 Single block, swivel shackle head 250 550 550 1210
RF20101 Single block, loop head 250 550 550 1210
RF20101HL High Load Single block, loop head 275 610 550 1210
RF20111 Single block, becket, loop head 250 550 550 1210
RF20141 Single block, stand-up 250 550 550 1210
RF20202 Double block, 2-axis shackle head 350 770 700 1540
RF20212 Double block, becket, 2-axis shackle head 350 770 700 1540
RF20281 Double block, in-line 250 550 550 1210
RF20284 Linked blocks, Series 20 & Series 20 250 550 550 1210
RF20302 Triple block, 2-axis shackle head 400 880 850 1870
RF20312 Triple block, becket, 2-axis shackle head 400 880 850 1870
RF20332 Triple block, cam cleat, 2-axis shackle head 400 880 850 1870
RF20151 Cheek block 250 550 550 1210
RF20151A Cheek block, rivet mount 250 550 550 1210
RF20171 Upright lead block 250 550 550 1210
RF20174 Pivoting lead block 250 550 550 1210
RF20175 Pivoting lead block cleat 150 330 300 660
RF20184 Single block, loop mount 250 550 550 1210
RF20711 Exit block, cover plate 250 550 1000 2200
RF20711A Exit block, side tabs 250 550 1000 2200
RF20711HL High load exit block, cover plate 275 610 1000 2200
RF20711AHL High load exit block, side tabs 275 610 1000 2200


RF20100 20mm Single Swivel Top Price: $18.66 RF20101 20mm Single Loop Top Price: $11.18
RF20101HL 20mm Single Loop Top HL Price: $17.81 RF20111 20mm Single Loop Top w/Bec Price: $13.56
RF20141 20mm Single Loop Standup Price: $17.81 RF20151 20mm Single Cheek Price: $14.41
RF20151A 20mm Single Cheek - Rivet Axle Price: $17.81 RF20171 20mm Upright Lead Price: $17.81
RF20174 20mm Pivot Lead Floppy Price: $32.26 RF20175 Pivoting Lead Block w/ Small T-Cleat Price: $59.46
RF20184 20mm Single In-line Price: $16.11 RF20202 20mm Double Price: $26.31
RF20212 20mm Double w/Bec Price: $29.71 RF20281 20mm Double In-Line Price: $28.86
RF20284 20mm Loop Tops Linked Price: $22.06 RF20302 20mm Triple Price: $36.51
RF20312 20mm Triple w/Bec Price: $39.06 RF20332 20mm Triple w/Cam&Bec Price: $78.16
RF20711 20mm Single Exit w/Cover Plate Price: $28.01 RF20711A 20mm Single Exit w/Side Tabs Price: $26.31
RF20711AHL 20mm Single Exit w/Side Tabs, HL Price: $29.71 RF20711HL 20mm Single Exit HL Price: $31.41


Ronstan Series 40 (Ball Bearing and High-Load)

Ronstan Series 40 (Ball Bearing and High-Load)

Third in the Ronstan Ball Bearing Block line, the Series 40 Blocks incorporate  --Smart Features--  with maximum working loads between 770 and 1320 lbs depending on the block configuration.  Sheaves are 40mm (1-1/2 inch) precision molded U.V. stabilized Acetal  with Acetal ball bearings and support a max line size of 3/8 inch (10mm).  High-load (HL) blocks can handle wire to 5/32 inch in diameter and have extruded Nylatron sheaves. The pin diameter on these blocks is 3/16 inch. Use these blocks for vangs, backstays, cunninghams, traveler controls, furling line leads and main/jib/spinnaker sheets. Work well for mainsheet, jib sheet, and control line situations on boats up to 26 feet. Ronstan Series 40 Blocks are incredibly strong for their size.  

Smart Features available on the configurations in this series consist of captive lock, swivel, loop, and shackle heads, ringless keyhole becket pins, quick adjusting cleat angles, and rinsing cutouts. Double and triple blocks are supplied with a shackle and have formed loop heads which can be attached directly to a line or attached to a shackle in three different ways. The cheek block sits flat on deck and is mounted with a bolt directly through the hub of the sheave for high strength.

Part # Description MWL BL
kg lbs kg lbs
RF40100 Single block, universal head 350 770 1000 2200
RF40100HL High load single block, universal head 500 1100 1000 2200
RF40101 Single block, loop head 350 770 1000 2200
RF40101HL High load single block, loop head 500 1100 1000 2200
RF40110 Single block, becket, universal head 350 770 1000 2200
RF40111 Single block, becket, loop head 350 770 1000 2200
RF40130 Single block, becket, adjustable cleat, universal head 250 550 500 1100
RF40140 Stand-up block, swivel head 350 770 800 1760
RF40151 Cheek block 350 770 1000 2200
RF40151HL High load cheek block 500 1100 1000 2200
RF41153 Curved surface adapter for cheek block - - - -
RF40171 Upright lead block 350 770 1000 2200
RF40171HL High load upright lead block 500 1100 1000 2200
RF40202 Double block, 2-axis shackle head 500 1100 1200 2650
RF40212 Double block, becket, 2-axis shackle head 500 1100 1200 2650
RF40285 Linked blocks, S40 & S30 300 660 750 1650
RF40300 Triple block, swivel shackle head 600 1320 1400 3090
RF40302 Triple block, 2-axis shackle head 600 1320 1400 3090
RF40312 Triple block, becket, 2-axis shackle head 600 1320 1400 3090


RF40202 Series 40mm Double Price: $58.23 RF40212 Series 40mm Double w/Bec Price: $63.71
RF41153 40mm Curved Foot Pad - Black Price: $8.46


Ronstan Series 40 (All Purpose)

Ronstan Series 40 (All Purpose)

Third in the Ronstan Ball Bearing Block line, the Series 40 Blocks incorporate --Smart Features-- with maximum working loads between 770 and 1540 lbs depending on the block configuration. Sheaves are 40mm (1-1/2 inch) precision molded U.V. stabilized Acetal and support a max line size of 3/8 inch (10mm) [except for RF40130 with max line size of 5/16" (8mm)]. The All Purpose (AP) blocks in the 40 Series do not have ball bearings but are extremely durable requiring virtually no maintenance. The pin diameter on these blocks is 3/16 inch. Use these blocks for vangs, backstays, cunninghams, traveler controls, furling line leads and main/jib/spinnaker sheets. Work well for mainsheet, jib sheet, and control line situations on boats up to 26 feet. Ronstan Series 40 Blocks are incredibly strong for their size.

Smart Features available on the configurations in this series consist of captive lock, swivel, loop, and shackle heads, ringless keyhole becket pins, quick adjusting cleat angles, and rinsing cutouts. Double and triple blocks are supplied with a shackle and have formed loop heads which can be attached directly to a line or attached to a shackle in three different ways. The cheek block sits flat on deck and is mounted with a bolt directly through the hub of the sheave for high strength.

Part # Description MWL BL
kg lbs kg lbs
RF41100 Single block, universal head 400 880 1000 2200
RF41101 Single block, loop head 400 880 1000 2200
RF41110 Single block, becket, universal head 400 880 1000 2200
RF41111 Single block, becket, loop head 400 880 1000 2200
RF41140 Stand-up block, swivel head 400 880 800 1760
RF41151 Cheek block 400 880 1000 2200
RF41153 Curved surface adapter for cheek block - - - -
RF41202 Double block, 2-axis shackle head 600 1320 1200 2650
RF41212 Double block, becket, 2-axis shackle head 600 1320 1200 2650
RF41302 Triple block, 2-axis shackle head 700 1540 1400 3090
RC72533 Single block, 25mm (1") T-track slide 400 880 800 1760


RF41100 40mm Single Swivel Price: $24.61 RF41101 40mm Single Loop Top Price: $16.96
RF41110 40mm Single Swivel w/Bec Price: $29.71 RF41111 40mm Single Loop Top w/Bec Price: $25.46
RF41140 40mm Single Standup Price: $30.56 RF41151 40mm Single Turning Block Price: $29.71
RF41153 40mm Curved Foot Pad - Black Price: $8.46 RF41202 40mm Double 2-Axis Head Price: $45.86
RF41212 40mm Double 2-Axis Head w/Bec Price: $50.96 RF41302 40mm Triple 2-Axis Head Price: $66.26
RF41312 40mm Triple 2-Axis Head w/Bec Price: $75.61


Ronstan Series 40 (Fiddles)

Ronstan Series 40 (Fiddles)

Ronstan Series 40 Fiddle blocks, like the rest of the 40 Series incorporate the Rontan  --Smart Features-- . These fiddles have maximum working loads between 770 and 880 lbs depending on the block configuration.  Sheaves are 40mm (1-1/2 inch) precision molded U.V. stabilized Acetal and support a max line size of 3/8 inch (10mm).  The RF40_ Ball Bearing (BB) fiddles have Acetal ball bearings.  The RF41_ All Purpose (AP) fiddles do not have ball bearings but are extremely durable requiring virtually no maintenance.  The pin diameter on these blocks is 3/16 inch. Use these blocks for purchase mainsheet and boom vang systems, and control line purchase systems on larger boats, including fine tune tackles, outhauls, checkstays, cunninghams, genoa lead pullers, and traveler controls.  

**Blocks are being phased out by the Orbit block line, if you don't find what you're looking for, visit our 40mm Orbit Block Page

Part # Description MWL BL
kg lbs kg lbs
RF40500 Ball bearing fiddle block, universal head 350 770 1000 2200
RF40510 Ball bearing fiddle block, becket, universal head 350 770 1000 2200
RF41500 All purpose fiddle block, universal head 400 880 1000 2200
RF41510 All purpose fiddle block, becket, universal head 400 880 1000 2200
RF41520 All purpose fiddle block, adjustable cleat, universal head 400 880 1000 2200
RF41530 All purpose fiddle block, becket, adjustable cleat, universal head 400 880 1000 2200


RF40500 Series 40mm Fiddle Price: $46.71 RF40530 Series 40mm Fiddle w/Cam & Bec Price: $80.71
RF41500 40mm Fiddle Price: $41.61 RF41510 40mm Fiddle w/Bec Price: $44.16
RF41520 40mm Fiddle w/Cam Price: $87.51 RF41530 40mm Fiddle w/Cam&Bec Price: $90.91


Ronstan Series 50 (Ball Bearing and High-Load)

Ronstan Series 50 (Ball Bearing and High-Load)

Like with the other Ronstan blocks, Series 50 Blocks incorporate  --Smart Features--  with maximum working loads between 1100 and 5290 lbs depending on the block configuration.  Sheaves are 50mm (2 inch) precision molded U.V. stabilized Acetal  with Acetal ball bearings and support a max line size of 1/2 inch (12mm).  High-load (HL) blocks can handle wire to 3/16 inch in diameter and have extruded Nylatron sheaves. The pin diameter on the single blocks is 3/16 inch and on doubles/triples 1/4 inch. Use these blocks for mainsheet, halyard, vang and spinnaker control applications on one design keelboats and sportboats to 33 feet. Also ideal for many control lines on larger boats.

Smart Features available on the configurations in this series consist of captive lock, swivel, loop, and shackle heads, ringless keyhole becket pins, quick adjusting cleat angles, and rinsing cutouts. Double and triple blocks are supplied with a shackle and have formed loop heads which can be attached directly to a line or attached to a shackle in three different ways.

Part # Description MWL BL
kg lbs kg lbs
RF50100 Single block, universal head 500 1100 1500 3310
RF50100HL High load Single block, universal head 800 1760 1500 3310
RF50101 Single block, loop head 500 1100 1500 3310
RF50110 Single block, becket, universal head 500 1100 1500 3310
RF50110HL High load single block, becket, universal head 800 1760 1500 3310
RF50111 Single block, becket, loop top 500 1100 1500 3310
RF50140 Stand-up block, swivel head 500 1100 1500 3310
RF50171 Upright lead block 500 1100 1500 3310
RF50171HL Single block, becket, loop top 500 1100 1500 3310
RF50200 Double block, universal head 800 1760 2000 4410
RF50210 Double block, becket, universal head 800 1760 2000 4410
RF50300 Triple block, universal head 1000 2200 2400 5290
RF50310 Triple block, becket, universal head 1000 2200 2400 5290
RC72534 Single block, 25mm (1") T-track slide 450 990 900 1980


RF50100 50mm Single Swivel Price: $35.49 RF50100HL 50mm Single Swivel HL Price: $55.21
RF50171 Series 50 BB Block, Upright Lead Price: $45.01 RF50171HL 50mm Single Vertical Turning HL Price: $62.01


Ronstan Series 50 (All Purpose)

Ronstan Series 50 (All Purpose)

Like with the other Ronstan blocks, Series 50 Blocks incorporate   --Smart Features--  with maximum working loads between 1100 and 2640 lbs depending on the block configuration.  Sheaves are 50mm (2 inch) precision molded U.V. stabilized Acetal and support a max line size of 1/2 inch (12mm).  The All Purpose (AP) blocks in the 50 Series do not have ball bearings but are extremely durable requiring virtually no maintenance.  The pin diameter on the single blocks is 3/16 inch and 1/4 on doubles/triples. Use these blocks for mainsheet, halyard, vang and spinnaker control applications on one design keelboats and sportboats to 33 feet. Also ideal for many control lines on larger boats.  Ronstan Series 50 blocks are 10-15 percent more compact than other blocks in their class that do not even come close to matching their strength.

Smart Features available on the configurations in this series consist of captive lock, swivel, loop, and shackle heads, ringless keyhole becket pins, quick adjusting cleat angles, and rinsing cutouts. Double and triple blocks are supplied with a shackle and have formed loop heads which can be attached directly to a line or attached to a shackle in three different ways. 

Part # Description MWL BL
kg lbs kg lbs
RF51100 Single block, universal head 750 1650 1500 3310
RF51101 Single block, loop head 750 1650 1500 3310
RF51110 Single block, becket, universal head 750 1650 1500 3310
RF51111 Single block, becket, loop head 750 1650 1500 3310
RF51140 Stand-up block, swivel head 750 1650 1500 3310
RF51151 Cheek block 500 1000 1500 2200
RF51153 Curved surface adapter for cheek block - - - -
RF51200 Double block, universal head 1000 2200 2000 4410
RF51210 Double block, becket, universal head 1000 2200 2000 4410
RF51300 Triple block, universal head 1200 2650 2400 5290
RC72535 Single block, 25mm (1") T-track slide 450 990 900 1980


RF51100 50mm Single Swivel Price: $31.41 RF51101 50mm Single Loop Top Price: $28.01
RF51110 50mm Single Swivel w/Bec Price: $41.61 RF51111 50mm Single Loop Top w/Bec Price: $34.81
RF51140 50mm Stand-up Block, Swivel Head, All-Purpose Price: $41.61 RF51151 50mm Cheek Block, All Purpose Price: $44.16
RF51200 50mm Double Price: $61.16 RF51210 50mm Double w/Bec Price: $71.36
RF51300 50mm Triple Price: $84.96


Ronstan Series 50 (Fiddles)

Ronstan Series 50 (Fiddles)

Ronstan Series 50 Fiddle blocks, like the rest of the 50 Series incorporate the Ronstan  --Smart Features-- . These fiddles have maximum working loads between 1100 and 1650 lbs depending on the block configuration.  The large/small  sheaves are 54mm/34mm (2-1/8 inch/1-5/16 inch) precision molded U.V. stabilized Acetal and support a max line size of 3/8 inch (10mm).  The RF50xxx Ball Bearing (BB) fiddles have Acetal ball bearings.  The RF51xxx All Purpose (AP) fiddles do not have ball bearings but are extremely durable requiring virtually no maintenance.  The pin diameter on these blocks is 3/16 inch. Use these blocks for purchase mainsheet and boom vang systems, and control line purchase systems on larger boats, including fine tune tackles, outhauls, checkstays, cunninghams, genoa lead pullers, and traveler controls.  

Part # Description MWL BL
kg lbs kg lbs
RF50500 Ball bearing fiddle block, universal head 500 1100 1500 3310
RF50510 Ball bearing fiddle block, becket, universal head 500 1100 1500 3310
RF50520 Ball bearing fiddle block, adjustable cleat, universal head 500 1100 1500 3310
RF50530 Ball bearing fiddle block, becket, adjustable cleat, universal head 500 1100 1500 3310
RF51500 All purpose fiddle block, universal head 750 1650 1500 3310
RF51510 Ball bearing fiddle block, becket, universal head 500 1100 1500 3310
RF51530 Ball bearing fiddle block, becket, adjustable cleat, universal head 500 1100 1500 3310


RF51500 50mm Fiddle Price: $55.21 RF51510 50mm Fiddle w/Bec Price: $59.46
RF51530 50mm Fiddle w/Cam&Bec Price: $108.76


Ronstan Series 60  (Ball Bearing)

Ronstan Series 60 (Ball Bearing)

Low friction 2-stage ball bearing system provides consistent performance over the full load range. Hight static and dynamic load capacity. Light weight. Head posts of swivel blocks can be locked at 0 or 90 degrees. Cheek cut-outs for easy bearing maintenance. Removable becket pins allow lines to be spliced prior to fitting. Blocks can be dissasembled for servising or customisation. Max line diameter is 10mm (3/8"). Pin diameter on the post is 6mm (1/4") except for light load block, which is 5mm (3/16").

Great for: mainsheet and spinnaker sheets on sportsboats to 33', halyard, vang and backstay applications on boats to 30', and various control line applications on larger yachts.

Pivoting lead blocks maintain alignment and keep lines as close to the deck as possible. Cheek block has through-hub mounting for maximum strenth and the singles can be stacked to create a double.

Carbon black Acetal ball bearings. UV stabilised Acetal Sheaves. Alloy cheeks. Shackles are forged 316 stainless steel.

Part # Description MWL BL
kg lbs kg lbs
RF60100 Single block 600 1320 1500 3310
RF60100L Single block, light load 300 660 1000 2200
RF60110 Single block, becket 600 1320 1500 3310
RF60151 Cheek block, single 600 1320 1500 3310
RF60174 Pivoting low lead block 300 660 1000 2200
RF60200 Double block 750 1650 1500 3310
RF60210 Double block, becket 750 1650 1500 3310
RF60251 Cheek block, double 600* 1320* 1500* 3310*
RF60300 Triple block 750 1650 1500 3310
RF60310 Triple block, becket 750 1650 1500 3310
RF60500 Fiddle block 600 1320 1500 3310
RF60510 Fiddle block, becket 600 1320 1500 3310

* Total block load. Maximum load on top sheave not to exceed 50% of total block load.



RF60100 60mm Single Price: $130.70 RF60110 60mm Single, Becket Price: $131.58
RF60151 60mm Cheek Block, Single Price: $77.31 RF60174 60mm Pivoting Low Lead Block Price: $104.79
RF60200 60mm Double Price: $182.42 RF60210 60mm Double, Becket Price: $187.44
RF60251 60mm Cheek Block, Double Price: $135.96


Ronstan Series 75 (Ball Bearing)

Ronstan Series 75 (Ball Bearing)

Low friction 2-stage ball bearing system provides consistent performance over the full load range. Hight static and dynamic load capacity. Light weight. Head posts of swivel blocks can be locked at 0 or 90 degrees. Cheek cut-outs for easy bearing maintenance. Removable becket pins allow lines to be spliced prior to fitting. Blocks can be dissasembled for servising or customisation. Max line diameter is 12mm (1/2"). Pin diameter on the post is 7mm (9/32").

Great for: mainsheet and spinnaker sheets on sportsboats to 36', halyard, vang and backstay applications on boats to 33', and various control line applications on larger yachts.

Cheek block has through-hub mounting for maximum strenth and the singles can be stacked to create a double.

Carbon black Acetal ball bearings. UV stabilised Acetal Sheaves. Alloy cheeks. Shackles are forged 316 stainless steel.

Part # Description MWL BL
kg lbs kg lbs
RF70100 Single block 1000 2200 2500 5510
RF70110 Single block, becket 1000 2200 2500 5510
RF70210 Double block, becket 1250 2760 2500 5510
RF70300 Triple block 1250 2760 2500 5510


RF70100 75mm BB Single Block Price: $148.78 RF70110 75mm BB Single Block, Becket Price: $161.99
RF70300 75mm BB Triple Block Price: $357.09



Ronstan Stand-Up Base

Ronstan Stand-Up Base

Stand-up base accepts a 3/8" post and 3/16" pin. Works with all Ronstan Series 40 blocks with posts (ie. not loop heads) and with only the singles with posts from Ronstan's Series 50. Base is a rhombus, 51mm x 75mm (2" x 2 31/32") angle-to-angle.

Part # Description MWL BL
kg lbs kg lbs
RF2450 Snap shackle head adapter 500 1100 1135 2500


RF2450 Stand-Up Base Price: $36.51



Ronstan Padeye for Stand-Up Blocks

Ronstan Padeye for Stand-Up Blocks

Use with Series 60, 75, and 100 blocks and RF324 Stand-Up Spring Kit for a hard-mounted stand-up connection. Four bolt-holes for 6mm (1/4") panhead bolts (not included).

Part # Description MWL BL
kg lbs kg lbs
RF2432-09 Padeye - - 4000 8820


RF2432-09 Pad Eye, 4 Mounting Holes, 9mm (11/32) Bar Price: $71.92



Ronstan Stand-Up Spring for Series 60, 75, 100

Ronstan Stand-Up Spring for Series 60, 75, 100

Use with Ronstan Series 60, 75 and 100 blocks and RF2432-09 padeye for hard mounted stand-up connection. Yes, that's really the price. Ronstan assures us that it's a very high quality spring.



RF324 Stand-Up Spring for Ronstan Series 60, 75, 100 Price: $68.81



Ronstan Snap Shackle Head Adapters

Ronstan Snap Shackle Head Adapters

Take the shackle off the post of your block and replace it with this adapter to make a snap-shackle block. Accepts a 3/8" post and 3/16" pin. Works with all Ronstan Series 40 blocks with posts (ie. not loop heads), Series 50 singles (only, the post on the Series 50 doubles and triples is too thick), all posted Series 60 Ratchets, and the light load Series 75 Ratchet single (RF72100L).

Part # Description MWL BL
kg lbs kg lbs
RF6170 Snap shackle head adapter 565 1250 1135 2500
RF6171 Trunnion snap shackle head adapter 565 1250 1135 2500


RF6170 Snap Shackle Head Adapter Price: $56.91 RF6171 Trunnion Snap Shackle, Block Head Price: $72.21

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