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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.


Sheave Ø (mm)
16 mm
Maximum line Ø (mm)
5 mm
Length (mm)
29 mm
Maximum working load (kg)
113 kg
Weight (g)
10 g
Breaking load (kg)
544 kg



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