About Us
Lock Joint Tube manufactures mechanical and structural grade steel tubing in five plants located in Indiana, Ohio, Texas, and Tennessee. Selecting hot rolled, cold rolled, aluminized, and galvanized steel, Lock Joint Tube services fabricators and distributors, as well as original equipment manufacturers with different sized and shaped steel tubing used in such diverse industries as solar, automotive, office furniture, health care, exercise, and display fixtures to name a few.

Processing capabilities:
Processing capabilities: Mechanical and structural grade steel tubing, saw and laser-cutting, custom tubing sizes including round, square, rectangle, oval, octagon, and other various special shapes.
We excel in special-shaped tubing to help differentiate our customers in their particular marketplaces. Our In-house metallurgical lab hosts 2 degreed metallurgists and 60 years of expertise in product and process metallurgy.
Industries Served
Lock Joint Tube is proud to work with a variety of industries, including but not limited to:
- Automotive
- Heavy-duty truck
- Solar
- Recreational Vehicles
- Furniture (office, hospital, music, standing desks)
- Exercise equipment
- Trailer
Why Lock Joint Tube?
We excel in special-shaped tubing to help differentiate our customers in their particular marketplaces. Our In-house metallurgical lab hosts 2 degreed metallurgists and 60 years of expertise in product and process metallurgy.
Our Metallurgists
Our metallurgists understand the importance of the raw material (steel coil) and how it responds to LJT processing into tubing. Design and engineering begins with technical interaction with the steel mills and optimizing chemistry, Hot Strip mill rolling practices, etc
Strive to reduce variability in our products so customer fabrications are predictable and controllable. This begins with consistency in raw materials, defining internal specifications often times more restrictive than industry or customer standards.
Apply best practice and Continuous Improvement methodologies to gain competitive advantages
Provide customers opportunities for cost reduction or light-weighting by introducing new shape profiles or stronger materials to reduce wall thickness or reduce tubing perimeter. LJT Technical Services offer customer Failure Analyses and Value Add Value Engineering support.
Lock Joint Tube is proud to work with a wide variety of industries including but not limited to:
Automotive, heavy-duty truck, solar, recreational vehicles, furniture (office, hospital, music, standing desks), exercise equipment, trailer.
we can accommodate special & unique requirements
Custom Tubing Solutions for Your Application
Process Innovation
At Lock Joint Tube, innovation isn’t just a buzzword—it’s in our DNA. For over a century, we’ve been redefining what’s possible in tube manufacturing. With over 360 unique shapes and sizes, we lead the industry in variety, offering more options than any other mill in North America.
Customer Service
At Lock Joint Tube, we understand that strong supplier communication is the foundation of a successful partnership.
Engineering Expertise
Industries
We are committed providing excellent service to the automotive, construction, excersice equipment, fence, furniture and solar industries, and we are always expanding our capabilities. Have an idea for a project? Contact our engineers today!
Have a Question?
Our experts can help
Give us a call at 800-257-6859 or leave us a message.
