2025 Ronstan Marine Catalogue - Catalog - Page 15
SPORTS BLOCKS
Series 25 & 30 Utility
13
SERIES 25
SERIES 30
RF2335
RF343
RF185
RF417
RF341
RF285
2 x 4mm (5/32”)
SERIES 30
RF188
RF186
RF187
RF81
RF83
RF82
RF807
4.8mm (3/16”) pin, suits single and fiddle blocks
Simple, versatile and economical blocks
that have many uses.
Hollow rivets accept fixing screws, shackles
or can be used as a becket for extra purchase.
Leech line tackles and bunk adjusters
on larger yachts.
Lightweight, durable construction.
V-jam cleats allow fast secure cleating of
control lines.
Sheaves: UV stabilised acetal.
Stainless steel cheeks and acetal sheaves
ensure long service life with virtually no maintenance
required.
PRODUCT No.
DESCRIPTION
Series 25 RF341
RF343
RF2335
All Purpose
Single block, becket, v-jam cleat, removable pin head
Triple block, becket, v-jam cleat, loop head
Single block, narrow, tube rivet head
Series 30 RF81
RF82
RF83
RF185
RF186
RF187
RF188
RF285
RF417
All Purpose
Double block, loop head
Triple block, loop head
Double block, becket, loop head
Single block, tube rivet head
Fiddle block, tube rivet head
Fiddle block, v-jam cleat, tube rivet head
Single block, becket, tube rivet head
Cheek block, curved base
Double block, tube rivet head
Cheeks: Grade 316 stainless steel.
Vang, cunningham and trapeze retriever
systems on dinghies.
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
M.W.L.
kg
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in.
MAX.
ROPE
in.
M.W.L.
lb
B.L.
lb
WEIGHT
oz
25
25
25
5
5
5
225
500
175
450
1000
350
30
75
65
1
1
1
3/16
3/16
3/16
500
1100
390
990
2200
770
1.1
2.6
2.3
30
30
30
30
30 + 40
30 + 40
30
30
30
8
8
8
8
8
8
8
8
8
300
550
300
300
300
300
300
300
450
600
1100
600
900
600
600
600
600
1300
40
60
50
20
50
60
35
42
40
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8 + 1 9/16
1 1/8 + 1 9/16
1 1/8
1 1/8
1 1/8
5/16
5/16
5/16
5/16
5/16
5/16
5/16
5/16
5/16
660
1210
660
660
660
660
660
660
990
1320
2420
1320
1980
1320
1320
1320
1320
2860
1.4
2.1
1.8
0.7
1.8
2.1
1.2
1.5
1.4
