Verified Nov 2026
Metal Fabrication
·
South Bend, Indiana
·
Since 1919
Lock Joint Tube manufactures mechanical, structural, and industrial steel tubing from its headquarters in South Bend, Indiana, founded in 1919. The company operates five production plants across Indiana, Ohio, Texas, and Tennessee, serving automotive, construction, medical, renewable-energy, and industrial-equipment sectors. With 200–500 employees and an estimated revenue of $50–100 million, it produces hot-rolled, cold-rolled, aluminized, and galvanized tubing, and acquired a Wisconsin mechanical tube facility in late 2025.
Lock Joint Tube at a glance
Revenue
$50-100M
Est. band
Employees
200-500
Founded
1919
Headquarters
South Bend, Indiana
Certifications
ISO 9001
Import activity
17
Industries
Automotive
Construction
Medical
Renewable Energy
Industrial Equipment
Sourcing and import activity
From US customs bill-of-lading records
US sea imports
17
Named foreign suppliers
8
Top origins
Germany · Italy · Belgium · Spain
Shared foreign counterparties do not establish that these companies buy from Lock Joint Tube.
What this tells a buyer
The company imports equipment and materials from Belgium, Germany, Italy, Spain, and the Netherlands, with Belgian suppliers accounting for over 9,700 shipments to support production.
Lock Joint Tube holds ISO 9001 certification and offers laser tube cutting, special coatings, value engineering, and lightweighting options tailored to industry-specific applications.
The privately held manufacturer operates five plants and recently expanded capacity through the acquisition of the Tectron Tube product line and facility.
Source: US customs bill-of-lading records and public filings · Last verified Nov 06, 2026
STABILITY SIGNALS
Established & active
107 years in operation (founded 1919).
17 US import shipments on record.
Holds ISO 9001 certification(s) per public sources.
Overview
Lock Joint Tube manufactures mechanical, structural, and industrial steel tubing from its headquarters in South Bend, Indiana, founded in 1919. The company operates five production plants across Indiana, Ohio, Texas, and Tennessee, serving automotive, construction, medical, renewable-energy, and industrial-equipment sectors. With 200–500 employees and an estimated revenue of $50–100 million, it produces hot-rolled, cold-rolled, aluminized, and galvanized tubing, and acquired a Wisconsin mechanical tube facility in late 2025.
At a glance
Attribute | Detail |
|---|---|
Founded | 1919 |
Headquarters | South Bend, Indiana |
Employees | 200-500 |
Revenue | $50-100M (estimated) |
Primary capability | Metal Fabrication |
Certifications | ISO 9001 |
What Lock Joint Tube makes
Lock Joint Tube holds ISO 9001 certification and offers laser tube cutting, special coatings, value engineering, and lightweighting options tailored to industry-specific applications.
Products and capabilities described on the company's own site include Steel, Interior (source: ljtube.com).
Certifications
Lock Joint Tube is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:
ISO 9001 — ljtube.com
Trade and customs footprint
The company imports equipment and materials from Belgium, Germany, Italy, Spain, and the Netherlands, with Belgian suppliers accounting for over 9,700 shipments to support production. US customs bill-of-lading records list 17 inbound shipments across 8 foreign suppliers, with top origins including Germany · Italy · Belgium · Spain.
Latest developments
2026-10-06 — Monitoring system makes production more reliable for tube maker (thefabricator.com)
2026-08-27 — Thank you! | Lock Joint Tube (linkedin.com)
2026-02-01 — Lock Joint Tube Acquires Tectron Tube Product Line and Facility (mfgnewsweb.com)
2025-12-03 — Lock Joint Tube buys Wisconsin mechanical tube plant - Steel Market Update (steelmarketupdate.com)
2025-12-02 — Lock Joint Tube acquires Tectron Tube product line and facility (thefabricator.com)
2025-12-01 — Atkore Inc. Announces Sale of Tectron Tube Product Line and Manufacturing Facility (businesswire.com)
Facilities
Lock Joint Tube is headquartered in South Bend, Indiana. Public sources also reference these locations:
De Pere, WI — mfgnewsweb.com
Company details
The privately held manufacturer operates five plants and recently expanded capacity through the acquisition of the Tectron Tube product line and facility. Lock Joint Tube was founded in 1919, has an estimated 200-500 employees, and is headquartered in South Bend, Indiana. On the LightSource stability read it is rated "Established & active": 107 years in operation (founded 1919). 17 US import shipments on record. Holds ISO 9001 certification(s) per public sources.
Frequently asked questions
What does Lock Joint Tube make?
Lock Joint Tube manufactures mechanical, structural, and industrial steel tubing from its headquarters in South Bend, Indiana, founded in 1919. The company operates five production plants across Indiana, Ohio, Texas, and Tennessee, serving automotive, construction, medical, renewable-energy, and industrial-equipment sectors. With 200–500 employees and an estimated revenue of $50–100 million, it produces hot-rolled, cold-rolled, aluminized, and galvanized tubing, and acquired a Wisconsin mechanical tube facility in late 2025.
Where is Lock Joint Tube headquartered?
Lock Joint Tube is headquartered in South Bend, Indiana (515 W Ireland Rd, South Bend, Indiana, 46614).
When was Lock Joint Tube founded?
Lock Joint Tube was founded in 1919.
How big is Lock Joint Tube?
Lock Joint Tube has an estimated 200-500 employees, with revenue in the $50-100M range (estimated).
What certifications does Lock Joint Tube hold?
Lock Joint Tube lists ISO 9001 on its website. Confirm the certified scope for the specific plant producing your part.
Does Lock Joint Tube import from overseas suppliers?
US customs bill-of-lading records show 17 inbound shipments for Lock Joint Tube, with top origins including Germany · Italy · Belgium · Spain.
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Last verified Nov 2026. Is this your company? Request a correction.
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