Description
3173 and 3174 high-load controls allow 2:1 to 6:1 purchases on offshore boats with mainsails over 37 m ² (400 ft ²). Controls feature 57 mm Black Magic Big Boat ball/roller sheaves and high-load aluminum sideplates.
Sheave Ø(mm)57 mm
Sheave Ø(in)2 1/4 in
Length (mm)164 mm
Length (in)6 7/16 in
Width (in)2 1/4 in
Width (mm)57 mm
Height above track (mm)28 mm
Height above track (in)1 1/16 in
Weight (g)981 g
Weight (oz)35 oz
Weight for pair (g)981 g
Weight for pair (oz)35 oz
Maximum line Ø(mm)12 mm
Maximum line Ø(in) 7/16 in
Maximum working load (kg)1134 kg
Maximum working load (lb)2500 lb
Breaking load (lb)5000 lb
Breaking load (kg)2268 kg
Purchase 1:1 / 2:1
Sheave Ø(in)2 1/4 in
Length (mm)164 mm
Length (in)6 7/16 in
Width (in)2 1/4 in
Width (mm)57 mm
Height above track (mm)28 mm
Height above track (in)1 1/16 in
Weight (g)981 g
Weight (oz)35 oz
Weight for pair (g)981 g
Weight for pair (oz)35 oz
Maximum line Ø(mm)12 mm
Maximum line Ø(in) 7/16 in
Maximum working load (kg)1134 kg
Maximum working load (lb)2500 lb
Breaking load (lb)5000 lb
Breaking load (kg)2268 kg
Purchase 1:1 / 2:1
Product Details
We usually dispatch within 2–8 days.
In a hurry? If the item’s in stock, we might be able to send it out the same day — just let us know.
Not the Right Fit? We’ve Got You.
If your boating gear isn’t quite right — in size, fit, or feel — you can return it within 30 days for a full refund or exchange. No stress, no risk.