Description
Low-profile mastbase halyard lead blocks are lightweight and can be grouped in a small area at the mastbase. Flared cheeks prevent chafe on the halyards. The high-load bearing system has a PTFE composite bushing and sideload balls. The sheave is hardcoat-anodized aluminum for additional strength.
Sheave Ø(mm)102 mm
Sheave Ø(in)4 in
Length (mm)173 mm
Length (in)6 13/16 in
Width (mm)50 mm
Width (in)1 15/16 in
Height (mm)130 mm
Height (in)5 1/8 in
Weight (g)1000 g
Weight (oz)35.25 oz
Maximum line Ø(mm)16 mm
Maximum line Ø(in)5/8 in
Number of fasteners3
Fasteners (mm)M16 SHCS mm
Maximum working load (kg)6000 kg
Maximum working load (lb)13227 lb
Breaking load (lb)26455 lb
Breaking load (kg)12000 kg
Sheave Ø(in)4 in
Length (mm)173 mm
Length (in)6 13/16 in
Width (mm)50 mm
Width (in)1 15/16 in
Height (mm)130 mm
Height (in)5 1/8 in
Weight (g)1000 g
Weight (oz)35.25 oz
Maximum line Ø(mm)16 mm
Maximum line Ø(in)5/8 in
Number of fasteners3
Fasteners (mm)M16 SHCS mm
Maximum working load (kg)6000 kg
Maximum working load (lb)13227 lb
Breaking load (lb)26455 lb
Breaking load (kg)12000 kg
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.