Custom Production Grinding LLC
Corporate brand
UnclaimedA Wisconsin precision grinding and honing shop that has held tight cylindrical tolerances for machine shops, contract manufacturers, and OEMs since 1983.
Last updated September 28, 2026
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Overview
Custom Production Grinding LLC (CPG) is an American precision grinding and honing company based in Menomonee Falls, Wisconsin. Founded in 1983, the company has concentrated on a single trade for decades: the precision grinding and honing of cylindrical parts, with surface grinding to match. Its customers are machine shops that need to subcontract work beyond their own equipment, contract manufacturers, and OEMs that prefer to outsource standing production rather than tool up for it in-house. CPG describes itself as a dedicated grinding shop rather than a general machine shop, and its published capabilities are the core of its identity: tolerances of 0.0002 inch on outside diameter (OD) and inside diameter (ID), 0.0001 inch on centerless grinding with roundness under 0.0001 inch, lengths held to 0.0006 inch, and surface finishes to 8 Ra. It also hones bores from 0.087 to 2.0 inches to the same standard. The company operates a climate-controlled 33,000-square-foot plant with more than forty grinding, honing, and hard-turning machines under one roof. Its equipment list includes ten centerless machines, twelve Mitsubishi CNC OD grinders, and ten Sunnen honing centers. Parts are inspected in two dedicated quality-control rooms with their own HVAC, under a quality system certified to ISO 9001:2015 by DNV. CPG works hardened steel, chrome-plated rod, and nickel and high-temperature alloys as production work, including Inconel, Hastelloy, Monel, Incoloy, A286, titanium, and PH stainless grades. CPG serves customers across industries such as automotive, agriculture, fluid handling, marine, and metering, including major national OEMs with headquarters or operations in the Midwest and beyond. The company emphasizes service reliability, acknowledging every order with a ship date and offering expedite capacity for line-down situations. At the start of 2021, a new ownership group acquired the company, remaining committed to its existing vision while investing in capabilities and service area. CPG is located close to Interstate 41 and U.S. Highway 45, providing efficient access for manufacturers in the region.
History
Custom Production Grinding LLC was founded in 1983 in Menomonee Falls, Wisconsin, and has focused on precision grinding and honing of cylindrical parts since that time. The company built its business around a single trade rather than general machining, positioning itself as a dedicated grinding shop that machine shops, contract manufacturers, and OEMs could rely on for work their own equipment could not hold or that they did not want to tool up for. Over the decades, CPG expanded its equipment and capabilities to more than forty grinding, honing, and hard-turning machines under one roof, including ten centerless machines, twelve Mitsubishi CNC OD grinders, and ten Sunnen honing centers. It developed the ability to work hardened steel, chrome-plated rod, and nickel and high-temperature alloys such as Inconel, Hastelloy, Monel, Incoloy, A286, titanium, and PH stainless grades as production work. The company also invested in quality infrastructure, including two dedicated QC rooms with their own HVAC, and achieved ISO 9001:2015 certification by DNV. At the start of 2021, a new ownership group acquired the company. The new owners stated a commitment to the existing vision while seeking to enhance capabilities and service area. The company operates from a 33,000-square-foot climate-controlled facility and continues to invest in equipment and people to grow the business. Its location near Interstate 41 and U.S. Highway 45 provides efficient access for manufacturers in the region.
- 2021
A new ownership group acquired the company at the start of 2021, committing to the existing vision and further enhancing capabilities and service area.
- 1983
Custom Production Grinding founded in Menomonee Falls, Wisconsin, focused on precision grinding and honing of cylindrical parts.
Products and positioning
A dedicated precision grinding and honing shop for cylindrical parts, serving machine shops, contract manufacturers, and OEMs that need tight diameters and fine finishes beyond their own capacity.
Precision OD grinding
Outside diameter grinding to tolerances of 0.0002 inch.
Precision ID grinding
Inside diameter grinding to tolerances of 0.0002 inch.
Centerless grinding
Centerless grinding to 0.0001 inch with roundness under 0.0001 inch.
Precision honing
Honing bores from 0.087 to 2.0 inches to tight tolerances.
Surface grinding
Surface grinding to match cylindrical grinding capabilities.
Hard turning
Hard turning as part of the company's grinding and honing operations.
Recent events
Reported
Custom Production Grinding unveils a new brand and website[4]
As part of its acquisition and growth plan, Custom Production Grinding unveiled a new brand and a new website.
Reported
Blackwell Capital Group acquires Custom Production Grinding[4]
Blackwell Capital Group acquired Custom Production Grinding, a Wisconsin-based provider of precision grinding services.
Sources4 sources
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