Detroit, Michigan · Est. 1980
American Manufacturing for the Arsenal of Democracy.
We Engineer Solutions for Mission Critical Industries.
Tolerance Tool is an independent machining and engineering firm focused on solving critical manufacturing challenges in support of human-safety grade missions of national interest.
Who we are
An independent precision engineering firm — Detroit, since 1980.
Quality is built in, not inspected in: verified at every stage, from material intake to final inspection. The parts are high-consequence — single points of failure in the programs they serve — and a program never changes hands as it grows. One team, one standard, prototype to production.
What we do
Machining
- CNC Machining — multi-axis machining centers running one-off prototypes through full-rate production, bar stock to finished part under one roof.
- CNC Turning & Turn-Mill — live-tool and twin-spindle turning centers finish complex parts complete in a single setup, up to 15-inch chucks.
- Precision Grinding — surface and OD/cylindrical grinding for the finishes and tolerances a milled or turned feature alone can't hold.
Tool, Die & Engineering
- Tool & Die — dies, fixtures, jigs, and gauging built and maintained in-house.
- Reverse Engineering & Solid Modeling — from an existing part to a machinable CAD model using CMM digitizing.
- Welding & Fabrication — TIG, MIG, gas, and arc in steel, stainless, aluminum, tool steel, copper, and titanium.
Inspection & Metrology
- Mitutoyo CMM, optical comparator, and a full metrology lab — first-article and in-process verification at every stage.
- Held to ±.0002″ when the print calls for it.
Prototype to Production & Rapid Response
- Prototype to Production — first article to rate manufacturing, same routings, same inspection.
- Rapid-Response Repair & Emergency Machining — mold and die repair and urgent machining when a line is down.
