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276
Series 75
2 x 10mm (3/8 )”
108A
RF74
RF74202
RF74151
RF74251
High static & dynamic load capacity achieved from 2-stage bearing system.
Ball bearings also address side thrust loads.
Long service life; vir tually maintenance free.
Central hub hole can be used as a becket take-off point.
RF74108 Halyard block has a removable 8mm (5/16”) threaded pin for
attaching to mast collar or mainsail headboard.
RF74108A Mast base block has removable 8mm (5/16”) clevis pin to suit a
14mm (9/16”) wide mast collar post.
*
Universal head can be fixed at 0° or 90° or left free to swivel, by using a
2.5mm Hex/Allen Key.
Mainsheet, spinnaker sheet, vang, halyard and backstay applications on
boats to 14m (46ft).
General applications on larger yachts.
Sheave: U.V. stabilised acetal, or anodised alumium (AW models).
Cheek plates: aluminium alloy.
Ball Bearings: High compression strength carbon black acetal.
Shackle & hub: Grade 316 stainless steel.
Pins: 2205 stainless steel (RF74108, RF74108A, RF74202).
B
LO
CKS
™
RF74108A suits 14mm (9/16”)
mast collar post (not supplied)
14mm
(9/16”)
RF74108
14mm (9/16”)
SHEAVE
DIAM.
MAX.
ROPE
PIN
DIAM. M.W.L. B.L. WEIGHT
SHEAVE
DIAM.
MAX.
ROPE
PIN
DIAM. M.W.L. B.L. WEIGHT
PRODUCT No.
DESCRIPTION
mm mm mm kg kg
g
in.
in.
in.
lb
lb
oz
Core Blocks™
RF74108
Halyard block
75
14
8 1500 3000 234
3
9/16 5/16 3300 6600 8.3
RF74108A
Mast base block
75
14
8 1500*
1
3000*
1
230
3
9/16 5/16 3300*
1
6600*
1
8.1
RF74151
Foot block, single
75
14
-
1500 3000 259
3
9/16 -
3300 6600 9.2
RF74202
Double block, non-swivel head
75
14
-
1500 3000 506
3
9/16 -
3300 6600 17.9
RF74251
Foot block, double
75
14
-
1500*
2
3000*
2
530
3
9/16 -
3300*
2
6600*
2
18.7
*1 Full block rated load can only be achieved with uniformly distributed load across full length of clevis pin. ie. 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.
NEW
NEW
