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Enter a Mil-Spec number or an IEH Part number. Mil-Spec numbers should start with “M55302/” followed by the rest of the part number. For IEH part numbers, please enter the first 8 characters.

Our Story

4th-Generation Family-Run, Manufactured in the USA for Nearly 80 Years.

Louis Offerman, Founder and 1st President of IEH, with his son Bernard, the 2nd President, Circa 1917.

Our company history began in New York City in 1941, when Louis Offerman and his two sons, Bernard and Seymour, founded a tool and die maker to support the war effort during WWII.

Following the war, we began making transistor and tube sockets for the nascent consumer electronics industry. We transitioned to supplying cathode ray tubes for the US television industry, and by the 1960’s we were the largest manufacturer of CRT sockets in the world!

In the late 1960’s we bought a license to manufacture Hyperboloid sockets, and began making printed circuit board connectors for the military and aerospace industries, under Mil-DTL-55302. We’ve been making these connectors ever since, and today, we’re one of the worldwide leaders in Hyperboloid connectors and contacts.

Louis Offerman in IEH’s original factory, 1941
Louis Offerman and his two sons Bernard and Seymour at IEH, 1965
Seymour Offerman, then President of IEH, with his nephew Michael Offerman, then VP of Sales, 1986

Four Generations of Family-Management

While much has changed over the years, our values and philosophy have remained the same. We’re still a family-managed business, and we still manufacture the highest quality products for the toughest environments. But most importantly, we remain committed to continuously improving our products and services, and exceeding our customers’ expectations, each and every day.