HP LOK Restrained Joint Pipe and Fittings

HP LOK Ductile Iron Pipeline

HP LOK Restrained Joint Pipe and Fittings provide flexible push-on joints for 30”–64” pipe sizes. The HP LOK Restrained Joint has a working pressure equivalent to the working pressure rating of the parent pipe with a maximum working pressure rating of 350 psi. An HP LOK Ring that is factory installed in the bell provides a positive axial lock between the bell interior surface and a retainer weldment on the spigot end of the pipe. HP LOK is available with a variety of coatings and linings. Metallic Zinc coating is also available.

Installation Video for 30 - 64" HP LOK

Product Downloads


  • HP LOK Restrained Joint

    HP LOK Restrained Joint Pipe and Fittings provide flexible push-on joints for 30"– 64" pipe sizes. The HP LOK Restrained Joint has a working pressure equivalent to the working pressure rating of the parent pipe with a maximum working pressure rating of 350 psi.

    View PDF
  • TYTON® Gasket

    U.S. Pipe’s TYTON® Gasket is used in U.S. Pipe’s TYTON JOINT® and HP LOK® Joint Ductile Iron Pipe & Fittings. It is a circular rubber gasket which has a modified bulb shape in cross section. The TYTON® Gasket conforms to ANSI/AWWA C111/A21.11. Composition and dimensions of the gasket have been carefully engineered to ensure a water-tight and lasting seal.

    View PDF
  • HP LOK® Field Weld

    This brochure describes the procedure to be used in applying a field weld bar to the plain end of field-cut HP LOK® Pipe. The weld bar is an integral component of the HP LOK Joint Restraint system. As such, it is to be applied with careful adherence to this procedure for proper performance. This procedure should only be applied by welders qualified in the skill of Shielded Metal Arc Welding (SMAW).

    View PDF
  • MJ HARNESS LOK

    View and/or download to see U.S. Pipe's restrained mechanical joint alternative to friction MJ restraint systems.

    View PDF
  • TR FLEX® and HP LOK® Telescoping Sleeves 4"-64"

    U.S. Pipe Telescoping Sleeves are Ductile Iron restrained joint fittings which can be utilized to provide expansion and contraction capability in a pipeline. Telescoping sleeves are available with TR FLEX ends for 4" through 24" sizes and with HP LOK ends for 30" through 64" sizes. The restrained joints of the telescoping sleeves are suitable for 350psi operating pressure in all sizes. Standard lining and coating is a petroleum asphaltic material.

    View PDF

Product Information


Product Information
HP LOK® Assembly
View Video