Who We Are

ISSI Company Mission:

To be the leading provider of comprehensive machining solutions—specializing in reverse engineering, engineering design, large manual machining, and multi-axis CNC machining—while consistently exceeding customer expectations for quality, precision, and reliability.

History of ISSI Engineering & Machining

ISSI, formerly known as Industrial Sales & Supply, Inc., was founded in 1991 by Max Rettig, who began with nothing more than industry knowledge, strong relationships, and a determination to meet customer needs. Working from his property in Plainfield, Indiana, Max didn’t own any machines at first—instead, he partnered with trusted shops, personally inspected the work, and ensured every part met his high standards before delivering them himself. His commitment to quality and reliability quickly earned trust, and as demand grew, so did the company—prompting Max to invest in his own machines to better serve his customers.

In 2006, ISSI moved into its current location in Indianapolis, within the Park Fletcher Industrial Park across from the Indianapolis International Airport, expanding its capabilities and services. A second building was added in 2011 to support continued growth. Following Max’s passing in 2020, ISSI was acquired by Gribbins Specialty Group—preserving his legacy of craftsmanship, integrity, and service while positioning the company for the future.

Today, ISSI is a full-service machining and precision grinding shop, offering advanced machining and engineering services—still driven by the values Max built the business on: hard work, responsiveness, and a deep understanding of customer needs.

MEET THE TEAM WHAT WE DO

A Proud Part of the Gribbins Family

Gribbins Specialty Group, headquartered in Evansville, Indiana, is a family of companies providing specialized services and solutions to industrial and commercial clients across the United States. As part of this family, ISSI proudly upholds the core values that define us: integrity, safety, quality, and service.

Integrity drives us to operate with honesty, transparency, and accountability in every project. Safety remains a top priority—for our team, our clients, and every work environment we support. Quality is at the core of everything we do, from complex engineering design to precision machining and grinding. Our commitment to service means going the extra mile to meet client needs, solve complex challenges, and build long-term partnerships based on trust and results.

Whether it’s engineering a custom process, reverse engineering a critical part, or delivering precision CNC and conventional machining, ISSI is your trusted partner for dependable, high-quality manufacturing solutions.