2025 Ronstan Marine Catalogue - Catalog - Page 32
SPORTS BLOCKS
Series 55 Orbit
30
RF55110
RF55410
RF55210
Integrated becket
RF55310
RF55410
RF48209
see page 17
DSH-6GRY
see page 232
RF56330B
see page 36
9:1 MAINSHEET
SYSTEM
RF150
4.8mm (3/16”) pin.
2-stage ball bearing system.
Swivel shackle head for unlimited block rotation.
Single inner cheeks on multi-sheave blocks
for reduced weight and bulk.
Ultra-low profile integrated becket.
PRODUCT No.
DESCRIPTION
Ball Bearing
RF55110
Single block, becket, swivel shackle head
RF55210
Double block, becket, swivel shackle head
RF55310
Triple block, becket, swivel shackle head
RF55410
Quad block, becket, swivel shackle head
Mainsheet systems on dinghies, catamarans,
sportsboats and small keelboats to 9m (30ft).
Halyard, vang and backstay applications
on boats to 8m (26ft).
RF55410 when paired with a RF56330B and a
RF45209 lashed to the becket with a RF9004-09 or
DSH-6GRY, produces a powerful 9:1 mainsheet system
for use on catamarans to 5.5m (18ft). 8mm (5/16”)
rope recommended.
Control line applications on larger yachts.
Swivel shackle head fitting: Grade 316
stainless steel.
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
10
10
10
10
5
5
5
5
500*1
750*2
750*2
750*2
1000
1500
1500
1500
88
172
244
316
2 5/32
2 5/32
2 5/32
2 5/32
3/8
3/8
3/8
3/8
3/16
3/16
3/16
3/16
1100*1
1650*2
1650*2
1650*2
2200
3300
3300
3300
3.1
6.1
8.6
11.2
*1 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.
*2 Total block load. Load on becket not to exceed 33% of block load. i.e. MWL 250kg (550lb), BL 500kg (1100lb).
