Jonesville Tool & Manufacturing offers a broad range of assembly and test services, supported by our highly skilled build-and-test personnel. Our degree of precision helps our customers realize a competitive advantage when outsourcing their assembly operations, including light assembly.

Testing enables JTM to achieve exceptionally high quality, and to prove the performance of an assembly prior to delivery. Our highly experienced quality engineering and inspection staff offers clients a broad range of testing options, including parts compliance testing, air leak testing, Mass Flow testing, resistance testing, automated visual inspection techniques. If your needs demand contract assembly and testing services, JTM can deliver.

Not Your Average Contract Manufacturer!

On-time delivery reports just came out and you guys are at 100% shipping to all plants. I want to thank you for this. Keep up the good work and let me know if there is anything I can do to help you guys out.


At JTM, we know that our reputation is based on the quality of our parts and our ability to meet delivery dates. That’s why we offer our clients peace of mind in the form of on-time, defect-free parts, every time.


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Jonesville Tool & Manufacturing – Your Contract Manufacturer for Life 517-849-2923