2025 Ronstan Marine Catalogue - Catalog - Page 31
SPORTS BLOCKS
Series 50 Utility
29
RF51500
RF51510
RF51530
RF6170
RF51140
RF51171
2 x 5mm (3/16”)
2 x 6mm (1/4”)
Fiddle blocks are ideal for fine-tune mainsheet tackles,
cunninghams, boom vangs, backstays
and other control line purchase systems.
Snap shackle adapter adds functionality to single and
fiddle blocks.
PRODUCT No.
3 x 6mm (1/4”)
Quick adjusting cleat arms require no tools to
adjust and fix in desired position.
Sheaves: UV stabilised acetal.
Low profile stand-up block has a swivel head post
to allow full articulation and rotation.
Mainsheet and halyard applications, vang and
spinnaker control lines on boats to 10m (33ft).
DESCRIPTION
All Purpose
RF51140
Stand-up block, swivel head
RF51151
Cheek block, aluminium cheeks
RF51171
Upright lead block
RF51500
Fiddle block, universal head
RF51510
Fiddle block, becket, universal head
RF51530
Fiddle block, becket, adjustable cleat, universal head
Accessories
RF6170
RF51151
Snap shackle head adapter
* MWL based on maximum allowable line load through cleat of 175kg (385lb), 4:1 purchase.
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
50
50
50
54 + 34
54 + 34
54 + 34
12
12
12
10
10
10
5
5
5
-
-
5
Cheeks: Impact modified, fibre
reinforced and UV stabilised nylon.
Load straps & head fittings:
Grade 316 stainless steel bearing race.
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in.
MAX.
ROPE
in.
500
500
750
750
750
700*
1000
1000
1500
1500
1500
1500
118
85
115
167
176
318
2
2
2
2 1/8 + 1 5/16
2 1/8 + 1 5/16
2 1/8 + 1 5/16
1/2
1/2
1/2
3/8
3/8
3/8
3/16
3/16
3/16
500
1000
49
-
-
3/16
PIN
DIAM. M.W.L.
mm
kg
PIN
DIAM. M.W.L.
in.
lb
B.L.
lb
WEIGHT
oz
1100
1100
1650
1650
1650
1540*
2200
2200
3310
3310
3310
3310
4.2
3.0
4.1
5.9
6.2
11.2
1100
2200
1.7
