About Diedrich Drill
For more than 50 years, Diedrich Drill has built a reputation for manufacturing durable, dependable drilling equipment used across the United States and around the world. Diedrich rigs are trusted by engineering firms, drilling contractors, and government agencies who rely on equipment that performs in demanding conditions.
Built for Performance, Proven in the Field
Founded in 1973 by John Diedrich, Diedrich Drill began as a small machine shop in La Porte, Indiana, dedicated to supplying precision parts for the coal and mineral exploration industries. Over the years, the company evolved rapidly, channeling its engineering expertise and commitment to quality into manufacturing drilling equipment and tooling that professionals in the geotechnical, environmental, and groundwater industries trust.
John Diedrich’s vision was simple yet bold: to build rugged and reliable drill rigs and components that deliver exceptional performance, durability, and ease of service. That commitment to innovation and customer-driven design has guided the company’s growth for more than five decades.
A New Chapter of Growth & Investment
In 2016, the private equity firm Cape Kauri Partners LLC acquired Diedrich Drill. The transaction reflected the group’s strategy of investing in middle-market industrial companies where operational expertise and financial backing could drive growth and efficiency across the company. The acquisition positioned Diedrich Drill for further expansion under private equity ownership while maintaining its established role in the drilling market.
Today, Diedrich Drill is still recognized as a premier manufacturer of top-quality drill rigs, and a full range of specialized tooling. Supported by a knowledgeable team of engineers, machinists, sales professionals, and service technicians, the company continues to set industry standards for performance and support, serving drilling professionals across the United States and around the world.
A Trusted Manufacturer of Drilling Equipment
With decades of experience and a broad range of models, Diedrich has earned a reputation as a trusted leader serving drilling professionals across multiple applications. Our focus on efficiency, reliability, and long-term use helps customers reduce downtime and get the job done right.
Short Lead Times
Integrated in-house production enables shorter, more reliable manufacturing timelines.
Durability First
Engineered to withstand years of heavy use in demanding field conditions.
In-House Manufacturing
Manufactured under one roof to ensure consistent quality, precise fit, and dependable performance.
Practical Customization
Standard rig platforms with configurable options, built for function, not overdesign.
Over 50 Years of Manufacturing Excellence
Diedrich Drill has supported the drilling industry for decades, building equipment that is commonly used for:
- Geotechnical investigations
- Standard penetration testing (SPT)
- Geothermal installations
- Groundwater monitoring and sampling
Many Diedrich rigs remain in service for decades, a testament to the quality of their design and construction. Our team continues to support legacy rigs with parts, tooling, and service expertise to ensure customers can keep their equipment operating efficiently.
Industry Affiliations
We’re proud to be connected with organizations that support innovation, safety, and advancement within the drilling and geotechnical industries. Through these partnerships and affiliations, we stay connected with industry best practices and emerging technologies while continuing to support the professionals who rely on drilling equipment every day.
Industries We Serve
Diedrich Drill equipment is trusted across multiple drilling industries for dependable field performance.
Geotechnical
Designed for soil and rock exploration, foundation testing, and standard penetration testing (SPT) in geotechnical and infrastructure projects.
Geothermal
Supports shallow geothermal and ground-source heat pump drilling applications requiring accuracy and consistent performance.
Groundwater
Used for groundwater exploration, monitoring, and observation wells, not high-volume well production.
Environmental
Provides control and adaptability for environmental site sampling, investigations, and monitoring in sensitive or confined conditions.