Single Line Clamshell Buckets Application: Hawco single line clamshell buckets can be used on any crane equipped with a single lifting hook. Designs are available with either automatic trip (touch down) or manual trip opening mechanisms. This type of clamshell bucket is primarily used on ship's cranes to unload bulk commodities from ships. Because of the designed digging characteristics of this type of bucket, the density of the materials to be handled is limited to 100 pounds per cubic foot. Sizes: _ to 8 cubic yards Standard Features: All alloy steel construction. Pins and bushings made of heat treated 4140 and 4150 alloy stock. All pins and bushings are lubricated through recessed grease fittings. Sheaves are cast of alloy steel and fitted with 9C aluminum bronze bushings. Oversized guide rollers for less cable wear. Lip material is T-1 alloy. Scoop reinforcing bars on bowls for prolonged life. Double rib support on bowl arms for additional strength. Recessed center shaft to protect from external contact. Options: 400 BHN hardened alloy steel lips Environmental "lap" type lip seal Environmental rubber lip seal Spill plates to increase capacity Spillways to decrease capacity Environmental dust covers Hydraulic dampening cylinders to reduce shock load to crane during mid-air opening