83
1734
716
714
712
754
727
C4579
C7842
694
693
692
691
High-Load Sheaves
High-load sheaves are offered as replacement parts or for use in special applications. Their bearing 
system combines sideload-carrying balls with a PTFE composite bushing to carry radial loads. While 
not as free-rolling as the standard Harken ball/roller bearing system, this compact bearing system is 
extremely durable and perfect for carrying high loads in a restricted diameter.
Installation requires clamping or securing inner race.
Custom sheaves available by request. View more options on harken.com.
Use for:
Masts
Booms
Deck organizers
Through-the-transom running backstays
Narrow Halyard & Steering Sheaves
Narrow high-load sheaves in mastheads improve sail handling, speed sail changes, and allow the use of smaller, 
lighter halyard winches. Used in steering systems, these sheaves return “feel” to wheel-steered boats.
Sheaves combine sideload-carrying balls with a PTFE composite bushing for radial loads. These durable sheaves 
are made of 6061-T6 aluminum and are well-suited for masthead and steering installations.
Installation requires clamping or securing inner race.
Use for:
Masthead/halyard sheaves
Steering systems
*Based on use of solid 304 stainless shafts.
Part
No.
Sheave
Ø
Width
Weight
Center pin
Ø
Max Ø
Maximum
working load
Breaking 
load*
Line
Wire
in
mm
in
mm
oz
g
in
mm
in
mm
in
mm
lb
kg
lb
kg
 712 
 4 
 102 
 7/8 
 22 
 10 
 284 
 11/16 
 17.6 
 1/2 
 12 
 5/16 
 8 
 12000 
 5443 
 32000 
 14515 
 714 
 5 
 127 
 1 
 25 
 17 
 481 
 7/8 
 22.28 
 5/8 
 16 
 5/16 
 8 
 15000 
 6804 
 51000 
 23133 
 716 
 6 
 152 
 1 
 25 
 23 
 652 
 7/8 
 22.28 
 5/8 
 16 
 3/8 
 10 
 18000 
 8165 
 51000 
 23133 
 727 
 2 1/4 
 57 
 7/8 
 22 
 4 
 113 
 3/8 
 10 
 1/2 
 12 
 5/16 
 8 
 4950 
 2245 
 9900 
 4491 
 754 
 3 
 76 
 7/8 
 22 
 5 
 142 
 1/2 
 12.7 
 1/2 
 12 
 5/16 
 8 
 7000 
 3175 
 16500 
 7484 
 1734 
 8 
 203 
 1 3/8 
 35 
 46 
 1300 
 1 1/4 
 31.7 
 7/8 
 22 
 1/2 
 12 
 37000 
 16783 
 100000 
 45360 
 C4579 
 6 
 152 
 1 1/4 
 32 
 32 
 903 
 1 31/64 
 37.74 
 7/8 
 22 
 
 
 41000 
 18600 
 82000 
 37200 
 C7842 
 3 1/2 
 90 
 1 15/16 
 50 
 20 
 578 
 11/16 
 18 
 5/8 
 16 
 
 
 12811 
 5811 
 25622 
 11622 
*Based on use of solid 304 stainless shafts.
Part
No.
Sheave
Ø
Width
Weight
Center pin
Ø
Max Ø
Maximum
working load
Breaking 
load*
Line
Wire
in
mm
in
mm
oz
g
in
mm
in
mm
in
mm
lb
kg
lb
kg
 691 
 3 
 76 
 5/8 
 16 
 4.5 
 128 
 1/2 
 12.7 
 3/8 
 10 
 3/16 
 5 
 4000 
 1814 
 16500 
 7484 
 692 
 4 
 102 
 3/4 
 19 
 8 
 227 
 1/2 
 12.7 
 7/16 
 12 
 5/16 
 8 
 8250 
 3742 
 16500 
 7484 
 693 
 5 
 127 
 3/4 
 19 
 12 
 340 
 3/4 
 19.1 
 7/16 
 12 
 5/16 
 8 
 12000 
 5443 
 37100 
 16828 
 694 
 6 
 152 
 7/8 
 22 
 19 
 539 
 3/4 
 19.1 
 1/2 
 12 
 3/8 
 10 
 16000 
 7258 
 37100 
 16828 

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