2025 Ronstan Marine Catalogue - Catalog - Page 44
SPORTS BLOCKS
Wire Blocks, Sheave Boxes & Exit Blocks
42
RF30721
RF25711
RF15711
RF35711HL
RF35711
RF25711HL
2 x 4mm (5/32”)
2 x 4mm (5/32”)
2 x 5mm (3/16”)
2 x 5mm (3/16”)
RF51712
RF41712
RF31712
RF45711
6 x 5mm (3/16”)
6 x 5mm (3/16”)
RF45711N
RF45711HL
6 x 5mm (3/16”)
D
D
B
A
A
B
C
C
2 x 6mm (1/4”)
Exit and sheave boxes are ideal for applications
where lines need to be led through decks, bulkheads
or spars minimising friction and chafing.
PRODUCT No.
Sheave Boxes RF31712
RF41712
RF51712
SHEAVE MAX.
DIAM. ROPE
mm
mm
MAX.
WIRE
mm
A
mm
B
mm
Special Purpose, Nylatron® Sheave
30
8
4
44.0
27
14.0
40
10
5
54.0
33
17.0
50
12
5
62.0
42
21.0
2 x 6mm (1/4”)
BB & AP sheaves: UV stabilised acetal.
Housings: Grade 316 stainless steel.
SP sheaves: Self-lubricating Nylatron®.
Housings: Aluminium alloy, anodised black RF45711,
RF45711HL, RF45711N.
HHL sheaves: Grade 2205 stainless steel.
C
mm
2 x 6mm (1/4”)
SHEAVE MAX.
DIAM. ROPE
in
in
MAX.
WIRE
in
45
75
145
1 3/16
1 9/16
2
5/16
3/8
1/2
5/32
3/16
3/16
D
mm
M.W.L.
kg
B.L.
kg
WEIGHT
g
5
5
5
375
500
750
800
1000
1500
A
in
B
in
C
in
D
in
M.W.L.
lb
B.L.
lb
WEIGHT
oz
1 3/4 1 1/16 9/16
2 1/8 1 5/16 11/16
2 7/16 1 5/8 13/16
3/16
3/16
3/16
830
1100
1650
1760
2200
3300
1.6
2.6
5.1
1 9/16
260
1 7/8
550
2 1/4
660
3 1/4
660
3 1/4 880/1760*
1210
2200
2430
1650
4410
0.5
0.6
1.2
2.1
2.7
Exit Blocks RF15711
RF25711
RF35711
RF30721
RF45711
Ball Bearing
15
5
20
6
30
8
30
8
40
10
10
12
14
18
22
13.0
13.0
19.0
23.0
30.0
40
48
58
82
83
120
250
300
300
400/800*
550
1000
1100
750
2000
14
18
34
60
77
9/16
3/4
1 3/16
1 3/16
1 9/16
3/16
1/4
5/16
5/16
3/8
-
1 1/16 3/8
1/2
1 5/16 1/2
1/2
1 5/8 9/16
3/4
2 11/16 11/16 15/16
2 1/4 7/8 1 3/16
Exit Blocks RF25711HL
RF35711HL
RF45711HL
High Grade Stainless Steel Sheave
20
6
34.0
12
30
8
42.0
14
40
10
58.0
22
13.0
19.0
30.0
48
58
83
300
550
1000
1100
1100
2000
22
56
123
3/4
1 3/16
1 9/16
1/4
5/16
3/8
-
1 5/16
1 5/8
2 1/4
1/2
9/16
7/8
1/2 1 7/8
3/4 2 1/4
1 3/16 3 1/4
2430
2430
4410
0.8
2.0
4.3
Exit Blocks -
All Purpose
30.0
75
400/800* 1600
65
1 9/16
5/16
-
2 1/4
5/8
1 3/16 2 15/16 880/1760* 3530
2.3
RF45711N
40
8
-
-
*MWL = 400kg dynamic load, 800kg static load.
27.0
34.0
42.0
68.0
58.0
58.0
16
660
1210
2200
