2020 Ronstan Sailboat Hardware Catalogue - Page 58



KEELBOAT BLOCKS
56
Series 75 Core
14mm (9/16”)
RF74100
RF74100AW
RF74108
RF74202
RF618T
RF74251
RF74151
ALUMINIUM SHEAVE
RF74110
2 x 10mm
(3/8”)
RF74140
RF74108A
14mm
(9/16”)
RF618A
8mm (5/16”) pin suits
single shackle head blocks
RF74108A suits 14mm (9/16”)
mast collar post (not supplied)
4 x 6mm (1/4”)
Universal head can be fixed at 0° or 90° or left free
to swivel, by using a 2.5mm hex key.
Mainsheet, spinnaker sheet, vang, halyard and
backstay applications on boats to 14m (46ft).
Ball bearings: High compression strength acetal.
RF74108 Halyard block has a removable
8mm (5/16”) screw pin for attaching to
mast collar or mainsail headboard.
General applications on larger yachts.
Pins: Grade 2205 stainless steel
(RF74108, RF74108A, RF74202).
RF74108A Mast base block has removable
8mm (5/16”) clevis pin to suit a 14mm (9/16”) wide
mast collar post.
PRODUCT No.
Shackle, post & hub: Grade 316 stainless steel.
Cheek plates: Aluminium alloy.
Sheave: UV stabilised acetal, or anodised
aluminium (SP models).
DESCRIPTION
SHEAVE MAX. MAX. PIN
DIAM. ROPE WIRE DIAM. M.W.L.
mm
mm mm mm
kg
Padeye: Grade 15-5PH stainless steel.
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in
MAX.
ROPE
in
Ball Bearing
RF618T
Twist shackle body, suits RF64202 & RF74202, for 90° attachment
RF74100
Single block, universal head
RF74108
Halyard block, screw pin with roller head
RF74108A
Mast base block, clevis pin head
RF74110
Single block, becket, universal head
RF74140
Stand-up block, swivelling
RF74151
Foot block, single
RF74202
Double block, non-swivel shackle head
RF74251
Foot block, double
75
75
75
75
75
75
75
75
14
14
14
14
14
14
14
14
-
8
8
8
8
-
1500
1500
1500*1
1500
1500
1500
1500
1500*2
3000
3000
3000*1
3000
3000
3000
3000
3000*2
40
354
234
230
428
468
259
506
530
3
3
3
3
3
3
3
3
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
Special Purpose - Aluminium Sheave
RF74100AW
Single block, rope/wire sheave, universal head
75
14
8
8
1500
3000
432
3
9/16
*1 Full block rated load can only be achieved with uniformly distributed load across full length of clevis pin. i.e. 14mm (9/16”) diameter mast collar post or 14mm (9/16”) wide mast collar plate/tang.
*2 Total block load. Maximum load on top sheave not to exceed 50% of total block load.
MAX. PIN
WIRE DIAM. M.W.L.
in
in
lb
-
5/16
5/16
5/16
5/16
-
5/16 5/16
B.L.
lb
WEIGHT
oz
3300
3300
3300*1
3300
3300
3300
3300
3300*2
6600
6600
6600*1
6600
6600
6600
6600
6600*2
1.4
12.5
8.3
8.1
15.1
16.5
9.2
17.9
18.7
3300
6600
15.3

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