Flip-flop block 437
cheeksinglewith fork

flip-flop block
flip-flop block
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flip-flop, cheek
Number of sheaves
with fork
Maximum line diameter
max. rope ø 5 mm
Application domain
for sailing dinghies
Working load

113 kg (249.1 lb)

Breaking load

544 kg (1,199.3 lb)


The 16 mm is Harkens® 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.


*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.