42
312
313
314
320
© Medora Media / Doug Wake
302
306
310
301
305
309
300
304
308
466
‡Fasteners included.     *#10 (5 mm) RH fasteners.     ** 6 mm (1/4") RH fasteners.     *** 8 mm (5/16") RH fasteners.   
Cutout
302 11 mm (13/32") x 39 mm (1 17/32")
306 13 mm (17/32") x 59 mm (2 5/16") 
310 14 mm (9/16") x 73 mm (2 23/32")
Line/Wire High 
Strength Blocks
Lightweight, low-friction wire blocks carry wire halyards 
and high-strength control lines on boats of all sizes. 
High-load composite bearings carry axial loads. 
Hard Lube-anodized sheave for strength and 
corrosion resistance. 
25 mm (1") wire blocks use low-friction thrust washers. 
38 mm (1.5") and 51 mm (2") wire blocks feature 
sideload balls between the sheave and the sideplate 
to minimize friction from unfair leads. 
466 features a forkhead and becket making it useful 
for vangs, halyards and control lines.   
Use for:
Wire halyards
Vangs
Control lines
High-load composite bearings handle 
wire and high-strength line.
Sideplates rotate to insert preswaged/
Nico-pressed wire fittings.
302 – 54 mm (2 1/8")
306 – 75 mm (2 15/16")
310 – 94 mm (3 11/16")
301 – 22 mm (7/8")
305 – 32 mm (1 1/4")
309 – 41 mm (1 5/8")
Part
No.
Description
Sheave
Ø
Weight
Shackle pin
Ø
Max wire
Ø
Max line
Ø
Maximum
working load
Breaking
load
in
mm
oz
g
in
mm
in
mm
in
mm
lb
kg
lb
kg
 300 
 Single 
 1 
 25 
 1 
 28 
 3/16 
 5 
 3/32 
 2 
 5/32 
 4 
 1000 
 454 
 2000 
 907 
 301 
 Cheek‡* 
 1 
 25 
 1.25 
 35 
 
 
 3/32 
 2 
 5/32 
 4 
 1000 
 454 
 2000 
 907 
 302 
 Through-deck* 
 1 
 25 
 1 
 28 
 
 
 3/32 
 2 
 5/32 
 4 
 1000 
 454 
 2000 
 907 
 304 
 Single 
 1 1/2 
 38 
 2.75 
 78 
 1/4 
 6 
 1/8 
 3 
 3/16 
 5 
 1500 
 680 
 3000 
 1361 
 305 
 Cheek‡** 
 1 1/2 
 38 
 3.25 
 92 
 
 
 1/8 
 3 
 3/16 
 5 
 1500 
 680 
 3000 
 1361 
 306 
 Through-deck* 
 1 1/2 
 38 
 3.25 
 92 
 
 
 1/8 
 3 
 3/16 
 5 
 1500 
 680 
 3000 
 1361 
 308 
 Single 
 2 
 51 
 5.25 
 149 
 5/16 
 8 
 3/16 
 5 
 1/4 
 6 
 2000 
 907 
 4000 
 1814 
 309 
 Cheek‡*** 
 2 
 51 
 6 
 170 
 
 
 3/16 
 5 
 1/4 
 6 
 2000 
 907 
 4000 
 1814 
 310 
 Through-deck** 
 2 
 51 
 5.75 
 163 
 
 
 3/16 
 5 
 1/4 
 6 
 2000 
 907 
 4000 
 1814 
 312 
 Single/becket 
 1 
 25 
 1.25 
 35 
 3/16 
 5 
 3/32 
 2 
 5/32 
 4 
 1000 
 454 
 2000 
 907 
 313 
 Single/becket 
 1 1/2 
 38 
 3 
 85 
 1/4 
 6 
 1/8 
 3 
 3/16 
 5 
 1500 
 680 
 3000 
 1361 
 314 
 Single/becket 
 2 
 51 
 5.75 
 163 
 5/16 
 8 
 3/16 
 5 
 1/4 
 6 
 2000 
 907 
 4000 
 1814 
 320 
 Ferrule head 
 1 1/2 
 38 
 3 
 85 
 
 
 1/8 
 3 
 3/16 
 5 
 1500 
 680 
 3000 
 1361 
 466 
 Single forkhead/becket 
 1 
 25 
 1.02 
 29 
 3/16 
 5 
 3/32 
 2 
 5/32 
 4 
 1000 
 454 
 2000 
 907 

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