2025 Ronstan Marine Catalogue - Catalog - Page 68
KEELBOAT BLOCKS
Series 180 Orbit
66
© Contest Yachts
RF189109A
RF189151
RF189251
1 x 16mm (5/8”)
2 x 20mm (3/4”)
Exceptionally high strength-to-weight ratio.
Captive ball bearings for side thrust loads.
Side cheeks incorporating head structure and hub
are precision machined as a single part from solid
alloy, leaving material only where it contributes to the
load carrying capacity of the block and eliminating the
need for additional fasteners.
PRODUCT No.
DESCRIPTION
Ball Bearing
RF189109A
Lashing block, single
RF189151
Foot block, single
RF189251
Foot block, double
* Total block load. Maximum load on top sheave not to exceed 50% of total block load
1 x 16mm (5/8”)
2 x 20mm (3/4”)
Foot block cover plate can be removed for service
access without removing fixing bolts.
Cheek plates: Fully machined aluminium alloy.
Mainsheet and genoa sheet systems on boats
to 31m (102ft).
Needle rollers: Torlon®.
Sheave: Aluminium alloy.
Ball bearings: Torlon®.
Spinnaker systems, halyards on boats to
33m (108ft).
Running backstay systems on boats to
32m (105ft).
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
PIN
DIAM.
mm
M.W.L.
kg
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in
MAX.
ROPE
in
PIN
DIAM.
in
180
180
180
26
22
22
-
12000
9750
9750*
30000
19500
19500*
2450
2075
3710
7
7
7
1
7/8
7/8
-
M.W.L.
lb
B.L.
lb
26400 66000
21500 42990
21500* 42990*
WEIGHT
oz
89.9
73.2
130.9
