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57mm Aluminum Mastbase Block

Part No. 1988

Sheave Ø (mm) 57 mm

Sheave Ø (in) 2 1/4 in

Maximum line Ø (mm) 10 mm

Maximum line Ø (in) 3/8 in

Maximum working load (kg) 1136 kg

Maximum working load (lb) 2500 lb

Low-profile mastbase halyard lead blocks are lightweight and can be grouped in a small area at the mastbase.
Sheave Ø (mm)57 mm
Sheave Ø (in)2 1/4 in
Length (mm)81 mm
Length (in)3 3/16 in
Width (mm)35 mm
Width (in)1 3/8 in
Height (mm)73 mm
Height (in)2 7/8 in
Weight (g)175 g
Weight (oz)6.2 oz
Maximum line Ø (mm)10 mm
Maximum line Ø (in) 3/8 in
Number of fasteners3
Fasteners (mm)6 FH mm
Fasteners (in)1/4 FH in
Maximum working load (kg)1136 kg
Maximum working load (lb)2500 lb
Breaking load (lb)5000 lb
Breaking load (kg)2273 kg