AMMAC, Inc. traces it history back to 1905 as W. H. Ottemiller Company.  Since it's beginning as a manufacturer of square head set screws, the company is today a contract manufacturer of screw machine products.  Located in York, PA., the company operates out of an 170,000 square foot facility located close to major interstates in central PA.


Our Mission

Is to provide the finest quality product delivered as promised at a fair and competitive price.  We continually strive to improve our processes and provide the highest level of service to our customers.



ISO Certified


Bar Code Labeling


Mill direct purchasing

Heat Treat and Plating

Packaging and Assembly Services