2025 Ronstan Marine Catalogue - Catalog - Page 18
SPORTS BLOCKS
Series 30 Utility
16
RF30101
RF30100
RF30101HL
RF30100HL
RF30111
RF30110
RF30141
RF30285
2 x 5mm (3/16”)
RF35711
RF30721
RF35711HL
RF30174
RF30171
2 x 5mm (3/16”)
RF34108
2 x 5mm (3/16”)
RF34000
2 x 5mm (3/16”)
2 x 5mm (3/16”)
Linked blocks are used for barber haulers,
cunninghams and spinnaker pole
launching systems.
Primary lead blocks on dinghies and catamarans.
Control lines on larger yachts.
Exit blocks minimise friction in lines passing through
the deck or exiting masts and booms.
PRODUCT No.
Ball Bearing
RF30100
RF30101
RF30110
RF30111
RF30141
RF30174
RF30285
RF34000
DESCRIPTION
RF615A
4mm (5/32”) pin,
suits swivel blocks
Upright lead blocks are a low profile solution
for leading halyards or other rig and sail controls back
to cleats or jammers. Pivoting version suits
controls that need to be trimmed from either
side of the boat.
RF323
6mm (1/4”)
Ball bearings: Acetal (RF34000 & RF34108
use Torlon® ball bearings).
Cheeks: Impact modified, fibre reinforced
and UV stabilised nylon.
BB sheaves: UV stabilised acetal.
Load straps & head fittings: Grade 316
stainless steel.
SP sheaves: Self-lubricating Nylatron®.
Frame/cheeks (RF34108): Grade 316 Stainless steel.
SHEAVE MAX. MAX. PIN
DIAM. ROPE WIRE DIAM. M.W.L.
mm
mm mm mm
kg
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in.
MAX.
ROPE
in.
MAX. PIN
WIRE DIAM. M.W.L.
in.
in.
lb
B.L.
lb
WEIGHT
oz
30
30
30
30
30
30
30+20
30
8
8
8
8
8
8
8+6
5
-
4
4
-
300
300
300
300
300
300
250
165
750
750
750
750
750
650
550
330
34
28
40
34
38
50
44
10
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16+3/4
1 3/16
5/16
5/16
5/16
5/16
5/16
5/16
5/16+1/4
3/16
-
5/32
5/32
-
660
660
660
660
660
660
550
360
1650
1650
1650
1650
1650
1430
1210
730
1.2
1.0
1.4
1.2
1.3
1.8
1.6
0.4
30
5
-
6
165
675
36
1 3/16
3/16
-
1/4
360
1490
1.3
30
30
8
8
-
-
300
300
1100
750
34
60
1 3/16
1 3/16
5/16
5/16
-
-
660
660
2430
1650
1.2
2.1
Special Purpose - Nylatron® Sheave
RF30100HL
Single block, swivel shackle head
RF30101HL
Single block, loop head
30
30
8
8
3
3
4
-
375
375
750
750
28
28
1 3/16
1 3/16
5/16
5/16
1/8
1/8
5/32
-
830
830
1650
1650
1.0
1.0
High Grade Stainless Steel Sheave
RF35711HL*
Single exit block
30
8
-
-
550
1100
56
1 3/16
5/16
-
-
1210 2430
2.0
RF34108
RF35711*
RF30721
Single block, swivel shackle head
Single block, loop head
Single block, becket, swivel shackle head
Single block, becket, loop head
Stand-up block
Pivoting lead block
Linked blocks, S30 & S20
Sheave, alloy, Torlon® balls
Single, removable loop head, alloy sheave,
Torlon® balls
Single exit block
Double exit block
RF134
RF134A (countersunk holes)
*Refer to the SUPPORT page at www.ronstan.com for mounting template.
