Weld-on Casing Adapters - Akkerman


Akkerman Inc.

Akkerman’s Weld-On Casing Adapters are often imitated, but never duplicated. These adapters are designed to connect pilot tubes that have been installed on line and grade to steel casing that will be installed by either auger boring or pipe ramming.  Designed with high grade steels and a specific weld process to match, these adapters can be custom built to suit your specific diameters.

Weld-On Reaming Head (WORH) Features:
  • Designed for guided auger boring applications in displaceable ground conditions.
  • Diameters up to 36-in can be connected directly to the installed pilot tube string using standard Akkerman supplied connections.
  • Multi-Stage WORHs are recommended for diameters larger than 36-in. Typical stage is ½ times the final casing diameter for casings up to 72-in.
  • Weld-On Reaming heads may be used with a pneumatic pipe ram in the event obstacles are encountered.
  • Weld-On Reaming heads allow the contractor to “lag the cutter” behind the adapter creating a natural plug during unstable ground, or easily remove augers for removal of obstacles.
  • Standard steel casing bore diameters are stocked. Custom diameters are available.
Guided Ramming Head Features:
  • Designed specifically for guiding steel casing installations using pneumatic pipe hammers.
  • Optimized to allow dynamic soil movement along the casing walls while resisting fatigue and eliminating side loading to keep the alignment straight.
  • An additional 10-ft hex core rod is recommended when connecting ramming heads directly behind pilot tubes to absorb additional shock loads.
  • Standard steel casing bore diameters are stocked. Custom diameters are available.

Single‐Stage Weld-On Reaming Head

Two‐Stage Weld‐On Reaming Head


Weld-on Casing Adapters

ModelDiameterGround ConditionsLength
WORH Standard12‐36 inN < 30110 in typ.
WORH 2-Stage42-72 inN < 3090 in typ.
GRH Standard20‐36‐in.Variable110 in typ.
GRH 2-StageCustomVariable90 in typ.
Print This Page


It is great to see a family-owned company in the tunneling industry continue to succeed and progress with their next generation of leadership at the helm. Akkerman continues to put cutting edge technology in the hands of contractors like ourselves that enable our talented people to do what we love to do: put pipe in the ground precisely online and grade! Whether it’s a guided boring system, a custom-built TBM, top notch field technician support on a Microtunnel drive, or the gathering of the industry’s top experts at one of their “Akktoberfests” to educate us all; they are doing things the right way. Akkerman has played a big role in our company’s success in the trenchless industry and we look forward to working with them for years to come.

See What Our Clients Say