2025 Ronstan Marine Catalogue - Catalog - Page 70
KEELBOAT BLOCKS
Upright & Pivoting Low Lead Blocks
68
RF68171
RF61171
RF61176
RF68174
4 x 6mm (1/4”)
1 x 8mm (5/16”)
1 x 10mm (3/8”)
1 x 8mm (5/16”)
1 x 10mm (3/8”)
1 x 8mm (5/16”)
1 x 10mm (3/8”)
RF78171
RF71171
RF78174
4 x 6mm (1/4”)
2 x 10mm (3/8”)
1 x 8mm (5/16”)
2 x 10mm (3/8”)
1 x 8mm (5/16”)
RF108171
2 x 10mm (3/8”)
1 x 8mm (5/16”)
High static and dynamic load capacity BB models have Torlon® needle rollers for
axial loads, and acetal ball bearings for side thrust
loads.
RF128171
3 x 10mm (3/8”)
1 x 8mm (5/16”)
3 x 12mm (7/16”)
1 x 10mm (3/8”)
Upright lead blocks keep lines close to the deck.
MAX.
ROPE
mm
M.W.L.
kg
Upright lead block
Pivoting low lead block
Upright lead block
Pivoting low lead block
Upright lead block
Upright lead block
Upright lead block
60
60
75
75
100
125
150
14
14
14
14
14
16
20
1500
1500
1990
1750
2200
3750
5500
Upright lead block
Over-the-top block
Upright lead block
60
60
75
14
14
14
1000
1000
1500
DESCRIPTION
Ball Bearing
RF68171
RF68174
RF78171
RF78174
RF108171
RF128171
RF158171
All Purpose
RF61171
RF61176
RF71171
Blocks can be disassembled for servicing.
Cheek cut-outs for easy bearing cleaning and
maintenance.
SHEAVE
DIAM.
mm
PRODUCT No.
RF158171
SHEAVE
DIAM.
in
MAX.
ROPE
in
M.W.L.
lb
B.L.
lb
WEIGHT
oz
3000 222
3000 341
3980 352
3500 470
4400 517
7500 777
11000 1714
2 3/8
2 3/8
3
3
4
5
6
9/16
9/16
9/16
9/16
9/16
5/8
3/4
3310
3310
4390
3860
4850
8270
12130
6610
6610
8770
7720
9700
16530
24250
7.8
12.0
12.4
16.6
18.2
27.4
60.5
3000
3000
3980
2 3/8
2 3/8
3
9/16
9/16
9/16
2200
2200
3310
6610
6610
8770
7.2
7.6
11.6
B.L.
kg
WEIGHT
g
205
215
329
