Harken 57mm Carbo Ratchamatic Flip Flop Block

Small Boat Flip-Flop blocks pivot around the line axis to keep the line close to the deck. Hinged construction allows for various lead angles. Ratchamatic block versions roll freely in both directions under low loads and automatically engage a ratchet mechanism as loads increase, giving sailors a holding power of up to 15:1. The ratchet engagement can be adjusted to a higher or lower load depending on the sailor’s strength, sailing style and system usage.

Technical Description

Sheave Ø (mm)	57 mm
Sheave Ø (in)	2 1/4 in
Length (mm)	110 mm
Length (in)	4 5/16 in
Width (mm)	50 mm
Width (in)	2 in
Height (mm)	66 mm
Height (in)	2 5/8 in
Weight (g)	156 g
Weight (oz)	5.5 oz
Maximum line Ø (mm)	10 mm
Maximum line Ø (in)	3/8 in
Maximum working load (kg)	227 kg
Maximum working load (lb)	500 lb
Breaking load (lb)	1000 lb
Breaking load (kg)	554 kg