Tel: (613) 764-0572

1262 Baker Road, CASSELMAN, Ontario Canada K0A 1M0


The 114 series tube expander is one of the most common boiler expanders. Used for flaring tubes with a 40-degree flare in a compact design. Self-retaining rollers held in place using an inner sleeve. Thus allowing the cage and rollers to be placed in the tube before inserting the mandrel. Therefore allowing easier insertion when limited access is available. Meanwhile, some manufacturers and service companies use a flaring expander before manual beading.
In summary, the general design of this expander incorporates overlapping rolls, accordingly this  eliminates ridging. Consisting of four straight rollers. This makes the gas-tight seal and an additional two rollers for flaring. Albeit a flaring expander, the 114 series is convertible to a straight rolling configuration.

Uses of the 114 Series Tube Expander

Therefore, listed as a general-purpose boiler tube expander for expanding and flaring tubes. These would be fire tube boilers, water wall, downcomers, economizers and air heaters. These tube expanders can also be converted to roll in a straight configuration.

Sizes Available

  • Tube OD 2.0″ to 4.1/2″
  • BWG 2 to 15.
  • Tube Sheet Thickness Range from 1/2″ to 2.5/8″.
  • Drum Mandrels are Available.
  • Header type Mandrels.
  • Short Series Mandrels 5.1/8″
  • Short Series Mandrels 7.1/8″

114 Series Tube Expanders for Flaring Boiler Tubes

114 Series Tube Expander
114 Series tube expanders for boilers


Furthermore, read the two tables horizontally together thereby giving you all the details required.

  1. Find the Tube OD and match it with the tube wall thickness.
  2. Check the minimum tube ID the tool will enter. (Tube OD – (2 x wall thickness)).
  3. Find the correct tube sheet thickness range.
  4. Then below the tube sheet thickness range is the required part number.
  5. Moving to the second panel gives you the Roll set part and part numbers for different mandrels.
  6. We suggest downloading these part number pages from the link below; 
114 series specifications. page 1.
114 Series Specifications Page 2.

Further Information

Read our page Rolling Boiler Tubes. This link, Rolling Boiler Tubes, describes how to work out the finished ID of the tube. Also, we cover reasons why boiler tube joints fail.