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Main Manufacturing, Inc.

. has manufactured and distributed hydraulic flanges to SAE J518, ISO 6162, ISO 6164, JIS, and other flange standards for over 50 years. MAIN also manufactures and/or sells flange adapters, SAE split flanges, manifolds, subplates, special hydraulic connectors and other components. A twenty-first century manufacturing facility, located in Grand Blanc, Michigan, allows MAIN to control quality and helps assure On-Time Delivery of both standard and special parts.


  • EXPERIENCE & QUALITY - comes from over 50 years of experience, our employees' dedication to quality, and a well- equipped and picky QC department.

  • AVAILABILITY - and on time delivery comes from our over 4 million-dollar inventory of standard flanges, special flanges, and other components (7500+ different items) and a quick turnaround of non-stock items.

  • ASSISTANCE - experts are available to HELP YOU and review your orders. MAIN's engineers are part of the SAE, NFPA, and ISO committees.

  • EFFICIENCY - was designed into our "State-of-the-Art" 48,000-sq.ft. US manufacturing facility. We can handle both small and large special requests quickly.

Main Manufacturing, Inc.WE ARE HERE TO HELP. Orders and inquiries are reviewed by engineers. Each week MAIN's order review system discovers many customer typos, mismatched descriptions, mismatched parts, and other problems. This saves time, money, and embarrassment. MAIN's engineers sit on several SAE and NFPA committees, have been US experts to ISO committees, and are involved in writing the standards. These same people are available to help customers with a difficult connection or piping situation.

*Note: Split Flanges, cap screws, lock washers, O-rings and some other accessory items are not made by MAIN Manufacturing. These items may or may not be imported.

Product Catalog

Connector Plates
(18 Products)
Hydraulic Fittings
(148 Products)
Pipe Fittings
(144 Products)
Pipe Flanges
(113 Products)
Tube Fittings
(4 Products)
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