2025 Ronstan Marine Catalogue - Catalog - Page 55
KEELBOAT BLOCKS
Series 45 Core
53
© Colab Creative
RF44100
RF44188
RF44140
RF6170
RF2429-02
13mm (1/2”)
inside width
High dynamic and static load capacity delivered by
an efficient 2-stage bearing system. Ball bearings also
counteract side thrust loads.
RF44140 Stand-up block features a strong
cast padeye base, and has a swivel head
post to allow full rotation and articulation.
Long service life; virtually maintenance free.
Mainsheet, halyard and spinnaker sheet applications
on boats to 10m (33ft).
Central hub hole can be used as a becket
take-off point.
RF44188 Halyard block incorporates a low profile
swivel head fork with a removable
screw pin for attaching to a padeye or
12mm (1/2”) diameter mast collar post.
2 x 6mm (1/4”)*
2 x 6mm (1/4”)
RF150
4.8mm (3/16”) pin
Sheave: UV stabilised acetal.
Cheek body: Aluminium alloy.
Various control line applications on
larger yachts.
Ball bearings: High compression strength acetal.
Shackle, head post & hub:
Grade 316 stainless steel.
Padeye: Grade 15-5PH stainless steel.
Fork pin: Grade 2205 stainless steel (RF44188).
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
PIN
DIAM.
mm
M.W.L.
kg
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in
MAX.
ROPE
in
PIN
DIAM.
in
M.W.L.
lb
B.L.
lb
WEIGHT
oz
Ball Bearing
RF44100
Single block, swivel shackle head
RF44140
Stand-up block, swivelling
RF44188
Halyard block, swivel fork head
45
45
45
12
12
12
5
5
5
700
700
700
1400
1400
1400
104
151
121
1 3/4
1 3/4
1 3/4
1/2
1/2
1/2
3/16
3/16
3/16
1540
1540
1540
3090
3090
3090
3.6
5.3
4.2
Accessories
RF2429-02
RF6170
-
-
5
750
500
1500*
1000
26
49
-
-
3/16
1650
1100
3300*
2200
0.9
1.7
PRODUCT No.
DESCRIPTION
Padeye, 34mm (1 5/16”) diameter (see page 207)
Snap shackle head adapter
* A4-80 DIN7991 grade fasteners recommended to achieve BL
