Welcome to HART Industrial Unions!


HART 2022-2023 Calendars are mailing soon!

HART 2022-2023 Calendars are on their way!


HART has expanded its manufacturing capacity to fully support the increased demand for high pressure pipe union applications. This includes all material variations of Carbon Steel commonly specified in high pressure systems.

HART is ready and able to respond to your needs for rapid turn around of difficult-to-find Carbon Steel Unions (as well as our entire line of Sure-Seal O-Ring Unions). We now offer Carbon Steel Unions in A105, A105 Normalized, A350-LF2, and 12L14 Carbon Steel to meet all service needs.

HART Industrial Unions, LLC is the leading domestic supplier of Sure Seal O-Ring Unions. We have a extensive selection of information and technical data about our products available on the left. If you have any questions or if we can help you further, please contact us at 1-800-769-0503.