Features：

• The grooves of sheave are intermediate frequency quenched so that the surface hardness will be improved and the service life will be extended.

• Combining the travelling block and the hook together reduces overall length to meet the requirements of a top drive.

• The primary load-carrying parts of the hook are subject to NDE test.

• There is a reliable safety device at the hook.

• The shafts of travelling block are forged with alloy steel and provided with a lubrication hole for single sheave bearing.

• The travelling block assembly is in accordance with API Spec. 8C and API monogram can be used on it.