2025 Ronstan Marine Catalogue - Catalog - Page 12
SPORTS BLOCKS
Series 20 Utility
10
RF20202
RF20332
RF20302
RF20101
RF20100
RF20101HL
RF20141
RF20111
RF20212
RF20312
RF20281
RF20284
4mm (5/32”)
RF498
Precision moulded acetal sheaves running on
stainless steel ball bearings provide high performance
& low friction.
SP versions feature a Nylatron® sheave
suitable for rope and wire.
High static and dynamic load capacity.
Light weight.
Versatile head fittings.
PRODUCT No.
RF1850S
3mm (1/8”) slotted pin, suits loop top single blocks
BL reduced to 500kg (1100lb)
RF318
Suits RF20101 & RF20111
DESCRIPTION
Single blocks are available with swivel head
or 2 way loop top.
Linked blocks are used for dinghy barber haulers,
cunninghams and spinnaker pole launching systems.
Double & triple blocks are supplied with shackle and
have a 2 way head that can be fixed at
0° or 90°.
Double & triple blocks allow the creation of powerful
purchase systems.
Upright lead blocks are available in low
profile fixed or pivoting options.
SHEAVE
DIAM.
mm
MAX. MAX. PIN
ROPE WIRE DIAM. M.W.L.
mm mm mm
kg
B.L. WEIGHT
kg
g
SHEAVE
DIAM.
in.
MAX. MAX. PIN
ROPE WIRE DIAM. M.W.L.
in.
in.
in.
lb
B.L.
lb
WEIGHT
oz
Ball Bearing
RF20100
Single block, swivel shackle head
RF20101
Single block, loop head
RF20111
Single block, becket, loop head
RF20141
Stand-up block
RF20202
Double block, 2-axis shackle head
RF20212
Double block, becket, 2-axis shackle head
RF20281
Double block, in-line
RF20284
Linked blocks, S20 & S20
RF20302
Triple block, 2-axis shackle head
RF20312
Triple block, becket, 2-axis shackle head
RF20332
Triple block, becket, cam cleat, 2-axis shackle head
20
20
20
20
20
20
20
20
20
20
20
6
6
6
6
6
6
6
6
6
6
6
-
3
4
4
4
4
4
250
250
250
250
350
350
250
250
400
400
400*
550
550
550
550
700
700
550
550
850
850
850
20
16
18
20
42
44
28
30
62
64
122
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
-
1/8
5/32
5/32
5/32
5/32
5/32
550
550
550
550
770
770
550
550
880
880
880*
1210
1210
1210
1210
1540
1540
1210
1210
1870
1870
1870
0.7
0.6
0.6
0.7
1.5
1.6
1.0
1.1
2.2
2.3
4.3
Special Purpose - Nylatron® Sheave
RF20101HL
Single block, loop head
20
6
3
-
275
550
14
3/4
1/4
1/8
-
610
1210
0.5
* Line load through cleat not to exceed 125kg (275lb).
