2025 Ronstan Marine Catalogue - Catalog - Page 36
SPORTS BLOCKS
Series 55 Orbit
34
ORBIT BLOCK™ RATCHET
HOLDING
POWER
20:1
RF56101
RF56100
RF56110
Auto & manual
ratchet modes
Load sensing
auto ratchet
RF150
4.8mm (3/16”) pin
RF56100 & RF56110 - swivel shackle head
for unlimited block rotation.
Spinnaker sheets on sportsboats and
small keelboats (lateral lead blocks).
Dinghy mainsheet systems.
Control line applications on larger yachts.
Mainsheet systems on sportsboats using RF6
or RF7 mainsheet swivel cleat unit.
Sheave: Anodised aluminium.
Spinnaker sheets on dinghies.
PRODUCT No.
Ball bearings: High compression strength acetal.
Frame/cheeks: Toughened,
glass fibre reinforced nylon.
Soft link: UV stabilised, multi-strand
SK78 Dyneema®.
Swivel shackle head fitting:
Grade 316 stainless steel.
DESCRIPTION
Ball Bearing
RF56100
Single block, auto and manual, swivel shackle head
RF56101
Single block, auto and manual, Dyneema® link head
RF56110
Single block, becket, auto and manual, swivel shackle head
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
55
55
55
10
10
10
PIN
DIAM. M.W.L.
mm
kg
5
5
250
250
250*
* Total block load. Load on becket not to exceed block load. i.e. MWL 250kg (550lb), BL 750kg (1650lb). Suitable for 2:1 system at rated block load.
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in.
MAX.
ROPE
in.
750
750
750
82
78
86
2 5/32
2 5/32
2 5/32
3/8
3/8
3/8
PIN
DIAM. M.W.L.
in.
lb
3/16
3/16
550
550
550*
B.L.
lb
WEIGHT
oz
1650
1650
1650
2.9
2.8
3.0
