Hanco Industrial Engine

Interstate Assembly Systems, formerly known as Southwest Products, is a leading provider of custom vehicle upfitting and assembly solutions in Santa Fe Springs, CA. With a commitment to delivering high-quality products built to precise specifications, Interstate Assembly Systems stands out from the competition by offering a comprehensive range of assembly solutions, from full-stage assembly line entry sequencing to in-plant production support and engineering product development.

With certified staff and facilities, Interstate Assembly Systems ensures that all customer, statutory, and regulatory requirements are met, while continuously improving processes and adhering to industry regulations. With extensive options and custom builds available for various industries, including wallboard, material handling, mechanics, fuel and lube, and railroad, Interstate Assembly Systems is the go-to choice for businesses seeking reliable and efficient assembly solutions.

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