33
407
406
391
405
404
404HL
408
416
416HL
417
376
432
421
437
442
368
409
467
404HL
416HL
Cutout
11 mm (7/16") x 35 mm (1 3/8")
Hardened stainless steel inner race 
for maximum strength-to-weight ratio.
16 mm
The 16 mm is Harken’s smallest block. It is perfect for small synthetic control lines 
found on high-tech dinghies. 
The bearing system uses stainless steel balls in a captive grooved race and has 
a 113 kg (250 lb) maximum working load—the highest on the market compared 
to similarly sized blocks.
The 442 uses a spacer and the 404/404HL uses an O-ring to keep the line in 
the sheave during intermittent loading.
The 467 and 484 use a narrow sheave for extremely small control lines and have 
a ferrule head for soft attachments. They use the same high load ball system. 
The 484 features a bronze sheave for added durability.
Use for:
Dinghy control lines Spinnaker pole trip lines
Big boat leech lines Outhauls
Downhauls 
Cunninghams
Traveler controls 
Halyards on prams
Actual size
Cutout
11 mm (7/16") x 41 mm (1 5/8")
12.7 mm
(1/2")
44.5 mm
(1 3/4")
27 mm
(1 1/16")
36 mm
(1 7/16")
60.3 mm
(2 3/8")
Part
No.
Description
Sheave
Ø
Length
Weight
Max line
Ø
Maximum
working load
Breaking
load
in
mm
in
mm
oz
g
in
mm
lb
kg
lb
kg
 368 
 In-line exit* 
 5/8 
 16 
 3 
 76 
 .94 
 27 
 7/32 
 5 
 250 
 113 
 1200 
 544 
 376 
 Forkhead 
 5/8 
 16 
 1 1/8 
 29 
 .38 
 11 
 7/32 
 5 
 250 
 113 
 1200 
 544 
 391 
 Hook-in halyard 
 5/8 
 16 
 1 5/8 
 41 
 .5 
 13 
 7/32 
 5 
 250 
 113 
 400 
 181 
 404 
 Single** 
 5/8 
 16 
 1 1/8 
 29 
 .33 
 10 
 7/32 
 5 
 250 
 113 
 1200 
 544 
Single/high-load
 5/8 
 16 
 1 1/8 
 29 
 .33 
 10 
 7/32 
 5 
500
226
 1200 
 544 
 405 
 Single/becket 
 5/8 
 16 
 1 1/2 
 38 
 .44 
 12 
 7/32 
 5 
 250 
 113 
 1200 
 544 
 406 
 Double 
 5/8 
 16 
 1 11/16 
 43 
 .94 
 27 
 7/32 
 5 
 450 
 204 
 1200 
 544 
 407 
 Double/becket 
 5/8 
 16 
 2 1/8 
 54 
 1 
 28 
 7/32 
 5 
 450 
 204 
 1200 
 544 
 408 
 Triple 
 5/8 
 16 
 1 13/16 
 46 
 1.44 
 41 
 7/32 
 5 
 700 
 318 
 1200 
 544 
 409 
 Triple/becket 
 5/8 
 16 
 2 1/4 
 57 
 1.5 
 43 
 7/32 
 5 
 700 
 318 
 1200 
 544 
 416 
 Cheek* 
 5/8 
 16 
 1 13/16 
 46 
 .44 
 12 
 7/32 
 5 
 250 
 113 
 1200 
 544 
Cheek/high-load
 5/8 
 16 
 1 13/16 
 46 
 .44 
 12 
 7/32 
 5 
500
226
 1200 
 544 
 417 
 Single/swivel*** 
 5/8 
 16 
 1 13/16 
 46 
 .63 
 18 
 7/32 
 5 
 250 
 113 
 750 
 339 
 421 
 Through-deck* 
 5/8 
 16 
 2 3/8 
 60 
 .63 
 18 
 7/32 
 5 
 250 
 113 
 1200 
 544 
 432 
 Pivot cheek* 
 5/8 
 16 
 1 3/8 
 35 
 .38 
 11 
 7/32 
 5 
 250 
 113 
 750 
 339 
 437 
 Flip-flop* 
 5/8 
 16 
 1 5/16 
 34 
 .75 
 21 
 7/32 
 5 
 250 
 113 
 1200 
 544 
 442 
 Block/eyestrap assembly* 
 5/8 
 16 
 1 3/8 
 35 
 .44 
 12 
 7/32 
 5 
 250 
 113 
 1200 
 544 
 467 
 Narrow ferrule head 
 5/8 
 16 
 1 15/32 
 37 
 .44 
 12 
 5/32 
 4 
 250 
 113 
 750 
 339 
*4 mm (#8) RH fasteners.    **Contact Harken for replacement O-rings HSB340.     ***Shackle pin diameter 4 mm (5/32"). 

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