2025 Ronstan Marine Catalogue - Catalog - Page 33
SPORTS BLOCKS
Series 55 Orbit
31
RF55101
RF55111
RF55171
2 x 6mm (1/4”)
RF55151
RF55201
RF55301
3 x 5mm (3/16”)
Integrated becket
Single inner cheeks on doubles and triples for
reduced weight and bulk.
RF55111 - Ultra-low profile integrated becket.
Mainsheet systems and spinnaker sheets
on dinghies, sportsboats and small keelboats
to 9m (30ft).
RF55151 - Recessed underside suits flat or
curved mounting surface.
Halyard, vang and backstay applications
on boats to 8m (26ft).
PRODUCT No.
DESCRIPTION
Ball Bearing
RF55101
Single block, Dyneema® link head
RF55111
Single block, becket, Dyneema® link head
RF55151
Cheek block
RF55171
Upright lead block
RF55201
Double block, Dyneema® link head
RF55301
Triple block, Dyneema® link head
Low profile head
Control line applications on larger yachts.
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.
M.W.L.
lb
B.L.
lb
WEIGHT
oz
55
55
55
55
55
55
10
10
10
10
10
10
-
500
500*
500
500
800
1000
1000
1000
1000
1000
1600
2000
68
75
70
91
134
205
2 5/32
2 5/32
2 5/32
2 5/32
2 5/32
2 5/32
3/8
3/8
3/8
3/8
3/8
3/8
-
1100
1100*
1100
1100
1765
2200
2200
2200
2200
2200
3520
4410
2.4
2.6
2.5
3.2
4.7
7.2
* Total block load. Load on becket not to exceed 50% of block load. i.e. MWL 250kg (550lb), BL 500kg (1100lb). Suitable for 2:1 system at rated block load.
