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Ronstan Series 50 All Purpose Block - Single Stand Up MPN-RF51140 SKU: CWR-70680
MPN: RF51140- $65.69
$59.72- $65.69
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Series 50 All Purpose Block - Single Stand UpFeatures: Exceptionally high working loads Low maintenance, long service life Self-lubricating Acetal polymer sheave ensures low friction and extreme durability Captive Lock™ universal head Slotted pin shackle eliminates fouled lines Mount with 2 x 5mm (3/6")...- $65.69
$59.72- $65.69
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Ronstan Series 50 All Purpose Single Loop Top - Becket MPN-RF51111 SKU: CWR-70679
MPN: RF51111- $65.45
$59.50- $65.45
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Series 50 All Purpose Single Loop Top - BecketFeatures: Exceptionally high working loads Low maintenance, long service life Self-lubricating Acetal polymer sheave ensures low friction and extreme durability Snap fit removable becket pin Spare Parts - RF51010 Replacement Becket Pin All purpose (AP) blocks...- $65.45
$59.50- $65.45
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Ronstan Series 40 Ball Bearing Orbit Block - Cheek MPN-RF45151 SKU: CWR-70626
MPN: RF45151- $42.77
$38.88- $42.77
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Series 40 Ball Bearing Orbit Block - CheekFeatures: Ultra Lightweight Low friction 2-stage Orbital ball bearing system Highest working load in its class Low profile and compact High performance cleating Base suits curved mounting surface Low mounting points for maximum strength LightweightKilogram for kilogram...- $42.77
$38.88- $42.77
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Ronstan Series 40 Ball Bearing Orbit Block - Single - Becket - Cleat - Swivel Head MPN-RF45130 SKU: CWR-70624
MPN: RF45130- $128.36
$116.69- $128.36
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Series 40 Ball Bearing Orbit Block - Single - Becket - Cleat - Swivel HeadFeatures: Ultra Lightweight Low friction 2-stage Orbital ball bearing system Highest working load in its class Low profile and compact High performance cleating LightweightKilogram for kilogram of working load, BB...- $128.36
$116.69- $128.36
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Ronstan Series 40 Ball Bearing Orbit Block - Single - Stand-Up Swivel Head MPN-RF45140 SKU: CWR-70625
MPN: RF45140- $69.25
$62.95- $69.25
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Series 40 Ball Bearing Orbit Block - Single - Stand-Up Swivel HeadFeatures: Ultra Lightweight Low friction 2-stage Orbital ball bearing system Highest working load in its class Low profile and compact High performance cleating Swivel shackle head for unlimited block rotation -grade 316 stainless...- $69.25
$62.95- $69.25
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Ronstan Series 40 Ball Bearing Block - Fiddle - Becket - Cleat MPN-RF40530 SKU: CWR-70623
MPN: RF40530- $129.89
$118.08- $129.89
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- Unit price
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Series 40 Ball Bearing Block - Fiddle - Becket - CleatFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Captive Lock™ universal head Slotted pin shackle eliminates fouled lines Snap fit removable becket pin Multi-position cleat arm Low...- $129.89
$118.08- $129.89
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Ronstan Series 40 Ball Bearing Block - Fiddle - Cleat MPN-RF40520 SKU: CWR-70622
MPN: RF40520- $125.31
$113.92- $125.31
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- Unit price
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Series 40 Ball Bearing Block - Fiddle - CleatFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Captive Lock™ universal head Slotted pin shackle eliminates fouled lines Multi-position cleat arm Sheaves running on Acetal or Torlon® ball bearings...- $125.31
$113.92- $125.31
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Ronstan Series 40 Ball Bearing Block - Fiddle - Becket MPN-RF40510 SKU: CWR-70621
MPN: RF40510- $82.51
$75.01- $82.51
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- Unit price
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Series 40 Ball Bearing Block - Fiddle - BecketFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Captive Lock™ universal head Slotted pin shackle eliminates fouled lines Snap fit removable becket pin Sheaves running on Acetal or Torlon®...- $82.51
$75.01- $82.51
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- Unit price
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Ronstan Series 40 Ball Bearing Block - Fiddle MPN-RF40500 SKU: CWR-70620
MPN: RF40500- $76.40
$69.45- $76.40
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- Unit price
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Series 40 Ball Bearing Block - FiddleFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Captive Lock™ universal head Slotted pin shackle eliminates fouled lines Low friction, 2-stage ball bearing system High static and dynamic load capacity Lightweight...- $76.40
$69.45- $76.40
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- Unit price
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Ronstan Series 40 Ball Bearing Block - Triple - Becket - Swivel Head MPN-RF40310 SKU: CWR-70619
MPN: RF40310- $128.36
$116.69- $128.36
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Series 40 Ball Bearing Block - Triple - Becket - Swivel HeadFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Features a swivel shackle head for full 360° rotation Sheaves running on Acetal or Torlon® ball bearings provide...- $128.36
$116.69- $128.36
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- Unit price
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Ronstan Series 40 Ball Bearing Block - Triple - Swivel Head MPN-RF40300 SKU: CWR-70618
MPN: RF40300- $116.14
$105.58- $116.14
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Series 40 Ball Bearing Block - Triple - Swivel HeadFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Features a swivel shackle head for full 360° rotation Sheaves running on Acetal or Torlon® ball bearings provide high performance...- $116.14
$105.58- $116.14
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- Unit price
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Ronstan Series 40 Ball Bearing Block - Double - Swivel Head MPN-RF40200 SKU: CWR-70616
MPN: RF40200- $94.73
$86.12- $94.73
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Series 40 Ball Bearing Block - Double - Swivel HeadFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Features a swivel shackle head for full 360° rotation Sheaves running on Acetal or Torlon® ball bearings provide high performance...- $94.73
$86.12- $94.73
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- Unit price
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Ronstan Series 40 Ball Bearing Block - Double - Becket - Swivel Head MPN-RF40210 SKU: CWR-70617
MPN: RF40210- $102.38
$93.07- $102.38
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Series 40 Ball Bearing Block - Double - Becket - Swivel HeadFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing...- $102.38
$93.07- $102.38
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- Unit price
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Ronstan Series 40 Ball Bearing Block - Single Upright Lead MPN-RF40171 SKU: CWR-70615
MPN: RF40171- $72.19
$65.63- $72.19
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Series 40 Ball Bearing Block - Single Upright LeadLead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision molded Acetal sheaves running on Acetal or Torlon® ball bearings provide high performance & low...- $72.19
$65.63- $72.19
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- Unit price
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Ronstan Series 40 Ball Bearing Block - Single Loop Top - Becket MPN-RF40111 SKU: CWR-70614
MPN: RF40111- $48.13
$43.75- $48.13
- (--10%)
- Unit price
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Series 40 Ball Bearing Block - Single Loop Top - BecketFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Snap fit removable becket pin Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction....- $48.13
$43.75- $48.13
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- Unit price
- per
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Ronstan Series 40 Ball Bearing Block - Single - Becket MPN-RF40110 SKU: CWR-70613
MPN: RF40110- $55.76
$50.69- $55.76
- (--10%)
- Unit price
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Series 40 Ball Bearing Block - Single - BecketFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Captive Lock™ universal head Slotted pin shackle eliminates fouled lines Snap fit removable becket pin Sheaves running on Acetal or Torlon®...- $55.76
$50.69- $55.76
- (--10%)
- Unit price
- per
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Ronstan Series 40 High Load Block - Single MPN-RF40100HL SKU: CWR-70612
MPN: RF40100HL- $72.19
$65.63- $72.19
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- Unit price
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Series 40 High Load Block - SingleFeatures: Exceptionally high working loads Lightweight Cheek cut-outs for easy bearing maintenance Suitable for both rope or wire Captive Lock™ universal head Slotted pin shackle eliminates fouled lines Ideal for high load applications. Wear resistant sheave material, in...- $72.19
$65.63- $72.19
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- Unit price
- per
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Ronstan Series 40 Ball Bearing Block - Single - Loop Top MPN-RF40101 SKU: CWR-70611
MPN: RF40101- $34.38
$31.25- $34.38
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- Unit price
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Series 40 Ball Bearing Block - Single - Loop TopFeatures: Low friction Acetal or Torlon® bearing system Lightweight Cheek cut-outs for easy bearing maintenance Low friction, 2-stage ball bearing system High static and dynamic load capacity Lightweight Cheek cut-outs for easy bearing maintenance Sheaves...- $34.38
$31.25- $34.38
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- Unit price
- per
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Ronstan Series 40 All Purpose Block - Single Cheek MPN-RF41811 SKU: CWR-70607
MPN: RF41811- $113.08
$102.80- $113.08
- (--10%)
- Unit price
- per
Series 40 All Purpose Block - Single CheekFeatures: Exceptionally high working loads Low maintenance, long service life Self-lubricating sheave All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic...- $113.08
$102.80- $113.08
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- Unit price
- per
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Ronstan Series 40 All Purpose Deck Organizer - 2 Sheave MPN-RF41821 SKU: CWR-70608
MPN: RF41821- $107.36
$97.60- $107.36
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- Unit price
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Series 40 All Purpose Deck Organizer - 2 SheaveFeatures: Lightweight design with cheek cut outs for easy bearing maintenance Through hub mounting for maximum strength All-purpose bearing system provides maximum static load capacity Mount with 4 x 6mm (1/4”) fasteners, not supplied Length 116mm...- $107.36
$97.60- $107.36
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- Unit price
- per
Frequently Asked Questions
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Repack bearings annually or every 10,000 miles with marine-grade grease to prevent water intrusion and seizing. Check for play or heat after each launch.
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Hubs are sized by axle spindle (1-1/16", 1-3/8", 1-3/4"); match brake type (electric/drum/hydraulic) and bolt pattern (4/5/6 on 4.5-6.5" centers).
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Transom savers, tie-down straps, and fenders protect hulls during towing; LED light kits ensure visibility, while bunks/rollers reduce launch friction.
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Use bow/stern straps rated for 2x boat weight, cross-strap hull sides, and check bunks for even weight distribution to avoid stress cracks.
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Choose 1,200-2,000 lb capacity for tongue weights up to 10% of trailer GVWR; crank or A-frame jacks for easy boat positioning.