SHOCK or BLOCK - Options For Every Application

Ronstan RF8080
SHOCK: the Sheaveless block
RF13101
Series 13 AP
Kite Block
RF666
Series 19 AP
Utility Block
RF20101
Series 20
BB Block
RF25109
Series 20
BB Orbit Block
Weight
(g)
2.5[1] 5.00 7.50 15.00 8.60
Weight
(oz)
0.01[1] 0.18 0.27 0.53 0.30
Load Capacity
MWL
(kg)
175 150 150 250 250[2]
MWL
(lb)
385 330 330 550 550[2]
BL
(kg)
350 300 400 550 550[2]
BL
(lb)
770 660 880 1210 1210[2]
Dimensions
Length
(mm)
22.9 30.9 31.6 37.9 32.3
Length
(in.)
7/8 1 1/4 1 1/4 1 1/2 1 1/4
Width
(mm)
14.9 16.5 19.2 20.5 20.3
Width
(in.)
9/16 5/8 3/4 13/16 13/16
Depth
(mm)
8.5 12.8 9.9 15.2 16.4
Depth
(in.)
5/16 1/2 3/8 5/8 5/8
 
Lead Height[3]
(mm)
17.9 16.1 15.0 19.0 14.2
Lead Height[3]
(in.)
11/16 5/8 5/8 3/4 9/16
Rope/Line Capacity
Line Capacity
(mm)
1.4 - 5.0 1.4 - 4.0 1.4 - 5.0 2.0 - 6.0 1.4 - 6.0
Line Capacity
(in.)
1/16 - 3/16 1/16 - 5/32 1/16 - 3/16 1/8 - 1/4 1/16 - 3/16
Optimum Line Capacity
(mm)
1.4 - 3.0 1.4 - 3.0 1.4 - 4.0 2.0 - 5.0 1.4 - 5.0
Optimum Line Capacity
(in.)
1/16 - 1/8 1/16 - 1/8 1/16 - 5/32 1/8 - 3/16 1/16 - 3/16
Friction at 45° change of angle with 90kg Block Load
1.4mm Dyneema®
(kite line) (% line load)
3.6[4] 3.0 3.2 3.0 3.0
3.0mm Covered Dyneema® (% line load) 7.3[4] 5.2 4.8 3.0 3.0
Friction at 180° change of angle
1.4mm Dyneema®
(kite line) (% line load)
6.8[4] 4.1 11.0 5.1 5.1
3.0mm Covered Dyneema® (% line load) 16.2[4] 5.6 9.4 5.2 5.2
5.0mm Covered Dyneema® (% line load) 19.1[4] NA[5] 5.6 5.7 5.7
Attachment Compatibility
Webbing (maximum)
(mm)
8.0 8.0
Webbing (maximum)
(in.)
5/16 5/16
Pigtail
Lashing
Saddle (RF498) By Lashing By Lashing
Shackle (RF1850S)
2 directions
Shackle (RF614)
Becket Hub capability
(for 2:1, 3:1)
Through head

 

 

  RF8080
SHOCK: the Sheaveless block
RF13101
Series 13 AP
Kite Block
RF666
Series 19 AP
Utility Block
RF20101
Series 20
BB Block
RF25109
Series 20
BB Orbit Block
PERFORMANCE CHART
Weight Ultra Light Very Light - Light Light
Size Ultra Compact Compact Compact - -
Lead Height Low Lead Low Lead Lowest Lead Low Lead Low Lead
Kite Line - Deflection Good Friction Very Good Friction Good Friction Lowest Friction Lowest Friction
Yacht Control Line - Deflection Very Good Friction Very Good Friction Very Good Friction Lowest Friction Lowest Friction
Yacht Control Line - Purchase System - Good Friction Good Friction Lowest Friction Lowest Friction
Impact Resistance Best - - - -
Salt Build-Up Resistance Best - - - -
Grit Resistance Best - - - -
Durability Extreme - Good - -
Load Capacity High - High High High
Poor Line Lead (Alignment) Tolerance Best - - - -
Ultra-thin Line (Kite Line) Compatibility Best - - - -
Soft Attachment Compatibility Best Good - - -
Metal Attachment Compatibility - - Very Good Best -
Colour Coding Yes Limited - - -
Coolness Extreme - - - -

*1 Less than one third the weight of typical stainless steel thimbles. *2 Block must be lashed through hub. *3 Outer edge of block head to bearing point on sheave.
*4 Approximately 33% less than stainless steel thimbles or alloy thimble/rings. *5 Rope capacity to 4mm (5/32”) maximum.
Dyneema is a registered trademark of Royal DSM.


 

Ronstan Shock Attachment Options
Ronstan Shock Attachment Options
Ronstan Shock Attachment Options
Ronstan Shock Attachment Options
Ronstan Shock Attachment Options
Ronstan Shock Attachment Options
Ronstan Shock Attachment Options
Ronstan Shock Attachment Options
Ronstan Shock Attachment Options
Ronstan Shock Attachment Options