2025 Ronstan Marine Catalogue - Catalog - Page 41
SPORTS BLOCKS
Series 75 Ultimate Ratchet Block™
39
RF72100
RF72175
4 x 6mm (1/4”)
RF72174
Clicking
Crew
RF72000
Load
Low
lead in
Pivoting
4 x 6mm (1/4”)
Effective extruded hole design provides
up to 20:1 holding power.
High quality forged stainless steel shackle
and durable alloy cheek plates.
Sheave & cheek plates: Anodised aluminium.
On/Off switch is fitted to both sides of block
so it can be used on port or starboard side.
Switch can be removed from one side if required.
Dinghy mainsheet systems - when maximum
holding power is required.
Ratchet pawl: High strength Torlon®.
Unique On/Off switch mechanism can be
operated under load.
Spinnaker sheets on sportsboats and
small keelboats (lateral lead blocks).
Ball bearings: High compression strength acetal.
Swivel shackle head fitting:
Grade 316 stainless steel.
Control line applications on larger yachts.
Low friction ball bearing system.
PRODUCT No.
DESCRIPTION
Ball Bearing
RF72000
Sheave
RF72100
Single block, manual, swivel shackle head
RF72174
Pivoting low lead block
RF72175
Pivoting low lead block, cleat
* Line load through cleat not to exceed 175kg (385lb).
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
75
75
75
75
12
12
12
12
PIN
DIAM. M.W.L.
mm
kg
7
-
420
420
420*
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in.
MAX.
ROPE
in.
2000
1370
1370
90
290
270
405
3
3
3
3
1/2
1/2
1/2
1/2
PIN
DIAM. M.W.L.
in.
lb
9/32
-
930
930
930*
B.L.
lb
WEIGHT
oz
4410
3020
3020
3.2
5.7
9.5
14.3
