Harken 16mm 404 Block

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The 16 mm is Harken’s smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race and has a 250 lb (113 kg) maximum working load. The 404 uses an O-ring to keep the line in the sheave during intermittent loading.


Length (in) 1 1/8 in
Weight (oz) .33 oz
Sheave Ø (mm) 16 mm
Sheave Ø (in) 5/8 in
Length (mm) 29 mm
Weight (g) 10 g
Maximum line Ø (mm) 5 mm
Maximum line Ø (in) 7/32 in
Maximum working load (kg) 113 kg
Maximum working load (lb) 250 lb
Breaking load (kg) 544 kg
Breaking load (lb) 1200 lb