2025 Ronstan Marine Catalogue - Catalog - Page 14
SPORTS BLOCKS
Series 25 & 30 Utility
12
SERIES 25
SERIES 30
RF571
RF572
RF2332
RF573
RF280
RF681
SERIES 30
RF469
RF470
RF469A
RF443
RF567
RF467
RF469A Cheek plates
rotate to open block
RF667
RF560
RF418
RF418C
RF468
RF104
RF103
Simple, versatile and economical blocks
that have many uses.
Vang, cunningham and trapeze retriever
systems on dinghies.
AP Sheaves: UV stabilised acetal.
SP Sheaves: Self-lubricating Nylatron®
Lightweight, durable construction and acetal
or Nylatron® sheaves.
Leech line tackles and bunk adjusters
on larger yachts.
Cheeks & head fittings:
Grade 316 stainless steel.
Stainless steel cheeks and acetal sheaves
ensure long service life with virtually no maintenance
required.
PRODUCT No.
DESCRIPTION
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
PIN/EYE
DIAM. M.W.L.
mm
kg
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in.
MAX.
ROPE
in.
PIN/EYE
DIAM. M.W.L.
in.
lb
B.L.
lb
WEIGHT
oz
Series 25 RF571
RF572
RF573
RF2332
All Purpose
Single block, loop head
Single block, becket, loop head
Single block, swivel shackle head
Single block, swivel ring head
25
25
25
25
6
6
6
6
4
10
300
300
150
150
600
600
300
300
15
20
20
20
1
1
1
1
1/4
1/4
1/4
1/4
5/32
3/8
660
660
330
330
1320
1320
660
660
0.5
0.7
0.7
0.7
Series 30 RF280
RF443
RF467
RF469
RF469A
RF470
RF567
RF681
All Purpose
Single block, loop head
Single block, swivel ring head
Single block, swivel shackle head
Single block, ferrule eye head
Single block, snatch
Single block, becket, ferrule eye head
Single block, becket, swivel shackle head
Single block, becket, loop head
30
30
30
30
30
30
30
30
8
10
10
10
10
10
10
8
13
5
10
10
10
5
-
300
250
250
300
300
300
250
300
600
500
500
600
600
600
500
600
20
44
50
40
40
45
55
25
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
5/16
3/8
3/8
3/8
3/8
3/8
3/8
5/16
1/2
3/16
3/8
3/8
3/8
3/16
-
660
550
550
660
660
660
550
660
1320
1100
1100
1320
1320
1320
1100
1320
0.7
1.6
1.8
1.4
1.4
1.6
1.9
0.9
45
45
25
25
25
20
20
6
6
3
3
3
3
2
6
6
3
3
3
3
2
850
850
450
450
450
250
200
1700
1700
900
900
900
500
400
88
80
40
39
33
20
20
1 3/4
1 3/4
1
1
1
3/4
3/4
1/4
1/4
1/8
1/8
1/8
1/8
3/32
1/4
1/4
1/8
1/8
1/8
1/8
3/32
1870
1870
990
990
990
550
440
3740
3740
1980
1980
1980
1100
880
3.1
2.8
1.4
1.4
1.2
0.7
0.7
Wire Blocks RF103
RF104
RF418
RF418C
RF468
RF560
RF667
Special Purpose, Nylatron® Sheave
Single block, tubular rivet head, removable sheave
Single block, ferrule top, removable sheave
Single block, tubular rivet head
Single block, removable clevis pin head
Single block, ferrule top, removable sheave
Single block, ferrule eye
Single block, loop top
