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
Sheave Ø (in)5/8 in
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