Skip to content
FREE SHIPPING COSTS FOR ORDERS OVER $200!
FREE SHIPPING COSTS FOR ORDERS OVER $200!

Ball Bearing Blocks 15-21mm

  • Ronstan Large SHOCK "the SHeaveless blOCK" (RF8081)

    Ronstan
    $18.56 - $18.56
    $18.56
    $18.56
    $18.56 - $18.56
    $18.56

    Available in two colour options - blue and red with several attachment options, including webbing, pigtail, lashing and dyneema links, it will be t...

    View full details
    $18.56 - $18.56
    $18.56
    $18.56
    $18.56 - $18.56
    $18.56

  • Ronstan S15 BB Block, Single, Loop top head (RF15101)

    Ronstan
    $15.68 - $15.68
    $15.68
    $15.68
    $15.68 - $15.68
    $15.68

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $15.68 - $15.68
    $15.68
    $15.68
    $15.68 - $15.68
    $15.68

  • Ronstan S15 BB Block, Single, Loop top head, Becket (RF15111)

    Ronstan
    $19.14 - $19.14
    $19.14
    $19.14
    $19.14 - $19.14
    $19.14

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $19.14 - $19.14
    $19.14
    $19.14
    $19.14 - $19.14
    $19.14

  • Ronstan S15 BB Block, Single, Swivel shackle head (RF15100)

    Ronstan
    $22.61 - $22.61
    $22.61
    $22.61
    $22.61 - $22.61
    $22.61

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $22.61 - $22.61
    $22.61
    $22.61
    $22.61 - $22.61
    $22.61

  • Ronstan S15 BB Block, Single, Stand-up (RF15141)

    Ronstan
    $27.82 - $27.82
    $27.82
    $27.82
    $27.82 - $27.82
    $27.82

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $27.82 - $27.82
    $27.82
    $27.82
    $27.82 - $27.82
    $27.82

  • Ronstan S15 BB Block, Double, Loop top head (RF15202)

    Ronstan
    $38.69 - $38.69
    $38.69
    $38.69
    $38.69 - $38.69
    $38.69

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $38.69 - $38.69
    $38.69
    $38.69
    $38.69 - $38.69
    $38.69

  • Ronstan S15 BB Block, Double, Loop top, Becket (RF15212)

    Ronstan
    $41.27 - $41.27
    $41.27
    $41.27
    $41.27 - $41.27
    $41.27

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $41.27 - $41.27
    $41.27
    $41.27
    $41.27 - $41.27
    $41.27

  • Ronstan S15 BB Block, Triple, Loop top head (RF15302)

    Ronstan
    $59.83 - $59.83
    $59.83
    $59.83
    $59.83 - $59.83
    $59.83

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $59.83 - $59.83
    $59.83
    $59.83
    $59.83 - $59.83
    $59.83

  • Ronstan S15 BB Block, Triple, Loop top, Becket (RF15312)

    Ronstan
    $63.13 - $63.13
    $63.13
    $63.13
    $63.13 - $63.13
    $63.13

    Ronstan's smallest and lightest ball bearing blocks.   Features: Smallest and lightest ball bearing block available Precision moulded acetal sheav...

    View full details
    $63.13 - $63.13
    $63.13
    $63.13
    $63.13 - $63.13
    $63.13

  • Ronstan S15 BB Block, Cheek (RF15151)

    Ronstan
    $19.60 - $19.60
    $19.60
    $19.60
    $19.60 - $19.60
    $19.60

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $19.60 - $19.60
    $19.60
    $19.60
    $19.60 - $19.60
    $19.60

  • Ronstan S15 BB Block, Upright Lead (RF15171)

    Ronstan
    $20.60 - $20.60
    $20.60
    $20.60
    $20.60 - $20.60
    $20.60

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $20.60 - $20.60
    $20.60
    $20.60
    $20.60 - $20.60
    $20.60

  • Ronstan S15 BB Block, Pivoting Lead (RF15174)

    Ronstan
    $36.99 - $36.99
    $36.99
    $36.99
    $36.99 - $36.99
    $36.99

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $36.99 - $36.99
    $36.99
    $36.99
    $36.99 - $36.99
    $36.99

  • Ronstan S15 BB Block, Single, Hook (RF15180)

    Ronstan
    $26.03 - $26.03
    $26.03
    $26.03
    $26.03 - $26.03
    $26.03

    Ronstan's smallest and lightest ball bearing blocks. Features: Smallest and lightest ball bearing block available Precision moulded acetal sheave...

    View full details
    $26.03 - $26.03
    $26.03
    $26.03
    $26.03 - $26.03
    $26.03

  • Ronstan S20 BB Orbit Block, Single, Becket, Lashing (RF25109)

    Ronstan
    $19.77 - $19.77
    $19.77
    $19.77
    $19.77 - $19.77
    $19.77

    The incredible Series 20 Orbit Block is capable of loads up to 250kg (550lb) while weighing a mere 9 grams. It's so light that it needs to be lashe...

    View full details
    $19.77 - $19.77
    $19.77
    $19.77
    $19.77 - $19.77
    $19.77

  • Ronstan S20 BB Block,Single Loop Top (RF20101)

    Ronstan
    $16.61 - $16.61
    $16.61
    $16.61
    $16.61 - $16.61
    $16.61

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Can be fitted with...

    View full details
    $16.61 - $16.61
    $16.61
    $16.61
    $16.61 - $16.61
    $16.61

  • Ronstan S20 HL Block,Single Loop Top (RF20101HL)

    Ronstan
    $25.36 - $25.36
    $25.36
    $25.36
    $25.36 - $25.36
    $25.36

    Ideal for high load applications. Wear resistant sheave material, in lightweight, self lubricating polymer, is suitable for use with rope or wire. ...

    View full details
    $25.36 - $25.36
    $25.36
    $25.36
    $25.36 - $25.36
    $25.36

  • Ronstan S20 BB Block,Single Loop Top Becket (RF20111)

    Ronstan
    $19.91 - $19.91
    $19.91
    $19.91
    $19.91 - $19.91
    $19.91

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Can be fitted with...

    View full details
    $19.91 - $19.91
    $19.91
    $19.91
    $19.91 - $19.91
    $19.91

  • Ronstan S20 BB Block,Single (RF20100)

    Ronstan
    $24.74 - $24.74
    $24.74
    $24.74
    $24.74 - $24.74
    $24.74

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Features: Low f...

    View full details
    $24.74 - $24.74
    $24.74
    $24.74
    $24.74 - $24.74
    $24.74

  • Ronstan S20 BB Block,Stand-Up Loop Top (RF20141)

    Ronstan
    $28.93 - $28.93
    $28.93
    $28.93
    $28.93 - $28.93
    $28.93

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Features: Low fr...

    View full details
    $28.93 - $28.93
    $28.93
    $28.93
    $28.93 - $28.93
    $28.93

  • Ronstan S20 BB Block,Double (RF20202)

    Ronstan
    $40.24 - $40.24
    $40.24
    $40.24
    $40.24 - $40.24
    $40.24

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Two-way head - can...

    View full details
    $40.24 - $40.24
    $40.24
    $40.24
    $40.24 - $40.24
    $40.24

  • Ronstan S20 BB Block,Double Becket (RF20212)

    Ronstan
    $42.93 - $42.93
    $42.93
    $42.93
    $42.93 - $42.93
    $42.93

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Two-way head - can...

    View full details
    $42.93 - $42.93
    $42.93
    $42.93
    $42.93 - $42.93
    $42.93

  • Ronstan S20 BB Block,Triple (RF20302)

    Ronstan
    $62.21 - $62.21
    $62.21
    $62.21
    $62.21 - $62.21
    $62.21

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction.Two-way head - can ...

    View full details
    $62.21 - $62.21
    $62.21
    $62.21
    $62.21 - $62.21
    $62.21

  • Ronstan S20 BB Block,Triple Becket (RF20312)

    Ronstan
    $65.65 - $65.65
    $65.65
    $65.65
    $65.65 - $65.65
    $65.65

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction.Two-way head - can ...

    View full details
    $65.65 - $65.65
    $65.65
    $65.65
    $65.65 - $65.65
    $65.65
  • Contact us

    Ronstan S20 BB Block,Single Exit,Side Tabs (RF20711A)

    Ronstan
    $26.52 - $26.52
    $26.52
    $26.52
    $26.52 - $26.52
    $26.52

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Sheave  20 mm...

    View full details
    $26.52 - $26.52
    $26.52
    $26.52
    $26.52 - $26.52
    $26.52
    Contact us

  • Ronstan S20 BB Block,Single Exit,Cover Plate (RF20711)

    Ronstan
    $26.52 - $26.52
    $26.52
    $26.52
    $26.52 - $26.52
    $26.52

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Sheave  20 m...

    View full details
    $26.52 - $26.52
    $26.52
    $26.52
    $26.52 - $26.52
    $26.52
  • Contact us

    Ronstan S20 HL Block,Single Exit,Cover Plate (RF20711HL)

    Ronstan
    $33.87 - $33.87
    $33.87
    $33.87
    $33.87 - $33.87
    $33.87

    Ideal for high load applications. Wear resistant sheave material, in lightweight, self lubricating polymer, is suitable for use with rope or wire ...

    View full details
    $33.87 - $33.87
    $33.87
    $33.87
    $33.87 - $33.87
    $33.87
    Contact us

  • Ronstan S20 BB Block,Single Cheek,Rivet Mount (RF20151A)

    Ronstan
    $25.80 - $25.80
    $25.80
    $25.80
    $25.80 - $25.80
    $25.80

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Features: Low f...

    View full details
    $25.80 - $25.80
    $25.80
    $25.80
    $25.80 - $25.80
    $25.80

  • Ronstan S20 BB Block,Single Cheek (RF20151)

    Ronstan
    $20.38 - $20.38
    $20.38
    $20.38
    $20.38 - $20.38
    $20.38

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Features: Low f...

    View full details
    $20.38 - $20.38
    $20.38
    $20.38
    $20.38 - $20.38
    $20.38

  • Ronstan S20 BB Block,Single Swivel Hook Head (RF20180)

    Ronstan
    $27.08 - $27.08
    $27.08
    $27.08
    $27.08 - $27.08
    $27.08

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Features: Low fr...

    View full details
    $27.08 - $27.08
    $27.08
    $27.08
    $27.08 - $27.08
    $27.08

  • Ronstan S20 BB Block,Single Loop Mount (RF20184)

    Ronstan
    $18.33 - $18.33
    $18.33
    $18.33
    $18.33 - $18.33
    $18.33

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Features: Low f...

    View full details
    $18.33 - $18.33
    $18.33
    $18.33
    $18.33 - $18.33
    $18.33

  • Ronstan S20 BB Block,Upright Lead (RF20171)

    Ronstan
    $21.41 - $21.41
    $21.41
    $21.41
    $21.41 - $21.41
    $21.41

    Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision moulded Acetal sheaves ...

    View full details
    $21.41 - $21.41
    $21.41
    $21.41
    $21.41 - $21.41
    $21.41

  • Ronstan S20 BB Block,Pivoting Lead (RF20174)

    Ronstan
    $38.46 - $38.46
    $38.46
    $38.46
    $38.46 - $38.46
    $38.46

    Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers.Precision moulded Acetal sheaves r...

    View full details
    $38.46 - $38.46
    $38.46
    $38.46
    $38.46 - $38.46
    $38.46

  • Ronstan S20 BB Blocks,Loop Top Linked (RF20284)

    Ronstan
    $34.04 - $34.04
    $34.04
    $34.04
    $34.04 - $34.04
    $34.04

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Features: Low f...

    View full details
    $34.04 - $34.04
    $34.04
    $34.04
    $34.04 - $34.04
    $34.04

  • Ronstan S20 BB Block,Double In-Line (RF20281)

    Ronstan
    $46.36 - $46.36
    $46.36
    $46.36
    $46.36 - $46.36
    $46.36

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Features: Low fr...

    View full details
    $46.36 - $46.36
    $46.36
    $46.36
    $46.36 - $46.36
    $46.36

  • Ronstan S20 BB Block,Pivoting Lead,Cleat (RF20175)

    Ronstan
    $81.72 - $81.72
    $81.72
    $81.72
    $81.72 - $81.72
    $81.72

    Swivel cleat bases permit easy cleating and releasing from any angle. Sheave can be relocated to allow the control line to feed from below. Comes c...

    View full details
    $81.72 - $81.72
    $81.72
    $81.72
    $81.72 - $81.72
    $81.72

  • Ronstan S20 BB Block,Triple Cleat Becket (RF20332)

    Ronstan
    $97.76 - $97.76
    $97.76
    $97.76
    $97.76 - $97.76
    $97.76

    Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction.Two-way head - can ...

    View full details
    $97.76 - $97.76
    $97.76
    $97.76
    $97.76 - $97.76
    $97.76

  • Harken 16 mm Air Block with O Ring (HK404)

    Harken
    $33.06 - $33.06
    $33.06
    $34.42
    $34.42 - $34.42
    $34.42

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $33.06 - $33.06
    $33.06
    $34.42
    $34.42 - $34.42
    $34.42

  • Harken 16 mm Air Block w/Becket (HK405)

    Harken
    $37.98 - $37.98
    $37.98
    $39.58
    $39.58 - $39.58
    $39.58

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $37.98 - $37.98
    $37.98
    $39.58
    $39.58 - $39.58
    $39.58

  • Harken 16mm Swivel Air Block (HK417)

    Harken
    $59.81 - $59.81
    $59.81
    $62.29
    $62.29 - $62.29
    $62.29

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $59.81 - $59.81
    $59.81
    $62.29
    $62.29 - $62.29
    $62.29

  • Harken 16mm Forkhead Block (HK376)

    Harken
    $47.53 - $47.53
    $47.53
    $49.49
    $49.49 - $49.49
    $49.49

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $47.53 - $47.53
    $47.53
    $49.49
    $49.49 - $49.49
    $49.49

  • Harken 16mm Anti-Capsize Block (HK442)

    Harken
    $50.01 - $50.01
    $50.01
    $52.13
    $52.13 - $52.13
    $52.13

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $50.01 - $50.01
    $50.01
    $52.13
    $52.13 - $52.13
    $52.13

  • Harken 16 mm Double Air Block (HK406)

    Harken
    $68.96 - $68.96
    $68.96
    $71.84
    $71.84 - $71.84
    $71.84

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $68.96 - $68.96
    $68.96
    $71.84
    $71.84 - $71.84
    $71.84

  • Harken 16 mm Double Air Block w/Becket (HK407)

    Harken
    $75.56 - $75.56
    $75.56
    $78.71
    $78.71 - $78.71
    $78.71

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $75.56 - $75.56
    $75.56
    $78.71
    $78.71 - $78.71
    $78.71

  • Harken 16 mm Triple Air Block (HK408)

    Harken
    $97.60 - $97.60
    $97.60
    $101.67
    $101.67 - $101.67
    $101.67

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $97.60 - $97.60
    $97.60
    $101.67
    $101.67 - $101.67
    $101.67

  • Harken 16 mm Triple Air Block w/Becket (HK409)

    Harken
    $102.67 - $102.67
    $102.67
    $106.99
    $106.99 - $106.99
    $106.99

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $102.67 - $102.67
    $102.67
    $106.99
    $106.99 - $106.99
    $106.99

  • Harken 16mm Pivoting Cheek Air Block (HK432)

    Harken
    $41.44 - $41.44
    $41.44
    $43.15
    $43.15 - $43.15
    $43.15

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $41.44 - $41.44
    $41.44
    $43.15
    $43.15 - $43.15
    $43.15

  • Harken 16mm Cheek Air Block (HK416)

    Harken
    $38.44 - $38.44
    $38.44
    $40.05
    $40.05 - $40.05
    $40.05

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses ...

    View full details
    $38.44 - $38.44
    $38.44
    $40.05
    $40.05 - $40.05
    $40.05

  • Harken 16mm Flip Flop Block (HK437)

    Harken
    $87.49 - $87.49
    $87.49
    $91.14
    $91.14 - $91.14
    $91.14

    The 16mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies.The patented bearing system uses s...

    View full details
    $87.49 - $87.49
    $87.49
    $91.14
    $91.14 - $91.14
    $91.14