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300
A
B
C
D
SHEAVE
DIAM.
MAX.
ROPE
MAX.
WIRE
M.W.L.
B.L.
WEIGHT
SHEAVE
DIAM.
MAX.
ROPE
MAX.
WIRE
M.W.L.
B.L.
WEIGHT
PRODUCT No.
mm mm mm
kg
kg
g
in.
in.
in.
lb
lb
oz
Upright Lead Blocks
RF453
22
3
3
160
320
30
7/8
1/8
1/8
350
700
1.1
RF568
19
5
-
250
500
20
3/4
3/16
-
550
1100
0.7
RF569
19
8
-
250
500
20
3/4
5/16
-
550
1100
0.7
RF917
19
8
-
250
500
20
3/4
5/16
-
550
1100
0.7
RF919
29
6
-
600
1200
50
1 3/32
1/4
-
1320
2640
1.8
RF2379
13
5
-
250
500
20
19/32
3/16
-
550
1100
0.7
RF2416
32
5
-
300
800
40
1 1/4
3/16
-
660
1760
1.4
SHEAVE
DIAM.
MAX.
WIRE M.W.L.
B.L. WEIGHT
SHEAVE
DIAM.
MAX.
WIRE M.W.L.
B.L. WEIGHT
PRODUCT No.
DESCRIPTION
mm mm kg
kg
g
in.
in.
lb
lb
oz
Wire Blocks
RF103
Single block, tubular rivet head, removable sheave
45
6
850 1700 88
1 3/4 1/4 1870 3740 3.1
RF104
Single block, ferrule top, removable sheave
45
6
850 1700 80
1 3/4 1/4 1870 3740 2.8
RF418
Single block, tubular rivet head
25
3
450 900 40
1
1/8 990 1980 1.4
RF418C
Single block, removable clevis pin head
25
3
450 900 39
1
1/8 990 1980 1.4
RF468
Single block, ferrule top, removable sheave
25
3
450 900 33
1
1/8 990 1980 1.2
RF560
Single block, ferrule eye
19
3
250 500 20
3/4
1/8 550 1100 0.7
RF667
Single block, loop top
19
2
200 400 20
3/4 3/32 440 880 0.7
SHEAVE
DIAM.
MAX.
ROPE
MAX.
WIRE A B C D M.W.L. B.L. WEIGHT
SHEAVE
DIAM.
MAX.
ROPE
MAX.
WIRE A B C D M.W.L. B.L. WEIGHT
PRODUCT No.
mm mm mm mm mm mm mm kg kg
g
in.
in.
in.
in.
in.
in.
in.
lb
lb
oz
Sheave Boxes
RF452
22
3
3 25.5 26 7.5 5 160 320 30
7/8 1/8 1/8 1
1 5/16 3/16 350 700 1.1
RF31712
30
8
4 44.0 27 14.0 5 375 800 45
1 3/16 5/16 5/32 1 3/4 1 1/16 9/16 3/16 830 1760 1.6
RF41712
40
10
5 54.0 33 17.0 5 500 1000 75
1 9/16 3/8 3/16 2 1/8 1 5/16 11/16 3/16 1100 2200 2.6
RF51712
50
12
5 62.0 42 21.0 5 800 1500 145
2
1/2 3/16 2 7/16 1 5/8 13/16 3/16 1760 3300 5.1
Wire blocks have purpose designed narrow sheaves and grooves.
Upright lead blocks are a low profile solution for leading lines to cleats
or jammers.
Sheave boxes are ideal for applications where lines (rope or wire) need to
be led through decks, bulkheads or spars minimising friction and chafing.
Wire blocks suit halyards, vang and backstay applications.
U.V. stabilised Acetal sheaves.
Nylatron
®
sheaves (wire blocks and sheave boxes).
Grade 316 stainless steel cheeks.
RF560
RF667
RF418C
RF418
RF103
RF104
RF468
RF453
RF568
RF569
RF2379
RF917
RF919
RF51712
RF41712
RF31712
RF452
Wire Blocks, Sheave Boxes & Upright Lead Blocks
RF2416
