2025 Ronstan Marine Catalogue - Catalog - Page 27
SPORTS BLOCKS
Series 40 Utility
25
RF41500
RF41520
RF41510
RF41530
RF6170
RF41171
2 x 5mm (3/16”)
RF41151
RF41153
3 x 5mm (3/16”)
3 x 6mm (1/4”)
3 x 5mm (3/16”)
Curved base adapter for cheek block
facilitates mounting on masts or booms.
Quick adjusting cleat arms require no
tools to adjust and fix in desired position.
Fiddle blocks are ideal for fine-tune mainsheet tackles,
cunninghams, boom vangs, backstays and other
control line purchase systems.
Snap shackle adapter suits single and
fiddle blocks.
Captive Lock™ universal head can be fixed at
0° or 90°, or left free to swivel on single blocks.
RODUCT No.
Sheaves: UV stabilised acetal.
Cheeks: Impact modified, fibre
reinforced and UV stabilised nylon.
Mainsheet and halyard applications, vang and
spinnaker control lines on off-the-beach boats and
small keelboats up to 8m (26ft).
DESCRIPTION
All Purpose
RF41151
Cheek block, stainless steel cheeks
RF41171
Upright lead block
RF41500
Fiddle block, universal head
RF41510
Fiddle block, becket, universal head
RF41520
Fiddle block, adjustable cleat, universal head
RF41530
Fiddle block, becket, adjustable cleat, universal head
RF41811
Cheek block, aluminium cheeks
Accessories
RF6170
RF41153
RF41811
Snap shackle head adapter
Curved surface adapter for RF41151 cheek block
*1 MWL based on maximum allowable line load through cleat of 125kg (275lb), 3:1 purchase.
*2 Line load through cleat not to exceed 125kg (275lb).
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
40
40
40 + 24
40 + 24
40 + 24
40 + 24
40
10
10
8
8
8
8
12
4
5
5
5
5
-
-
-
5
-
Load straps & head fittings:
Grade 316 stainless steel.
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in.
MAX.
ROPE
in.
400
400
400
400
375*1
400*2
400
1000
1000
1000
1000
1000
1000
1000
66
59
91
98
157
164
65
1 9/16
1 9/16
1 9/16 + 15/16
1 9/16 + 15/16
1 9/16 + 15/16
1 9/16 + 15/16
1 9/16
3/8
3/8
5/16
5/16
5/16
5/16
1/2
5/32
3/16
3/16
3/16
3/16
-
500
-
1000
-
49
9
-
-
3/16
-
PIN
DIAM. M.W.L.
mm
kg
PIN
DIAM. M.W.L.
in.
lb
B.L.
lb
WEIGHT
oz
880
800
880
880
825*1
880*2
880
2200
2200
2200
2200
2200
2200
2200
2.3
2.1
3.2
3.5
5.5
5.8
2.3
1100
-
2200
-
1.7
0.3
