3400 Series

Flaring Boiler Expanders

High-Quality Steel For The Most Demanding Boiler Applications.

The recommended tube expanders for flaring tubes in watertube and firetube boilers.

3400 Series Expander
  • Tube Size: 1.500″ to 4.000″ (38.1 – 101.6mm) OD

  • Roll Type: Flaring

  • Application: Firetube Boiler and Watertube Boiler

Prong Style Collar Allows For Uniform Flaring

The prong style thrust collar produces uniform flare lengths as well as torque controlled tube rolling to obtain uniform expanded joints.

Prong Style Thrust Collar

Uniform flare lengths without the risk of driving flare rolling into the tube sheet.

High-Quality Steel

Manufactured from high-quality tool steels to assure long life under the toughest conditions.