Profile: Michigan Spline Gage Co. is a source for precision spline and gear products. Our gage line includes precision spline and gear products such as concentricity spline gages, master gears, variable spline gages, tapered spline arbors & spline related products. We specialize in designing, manufacturing and calibrating a wide variety of precision spline gages and related spline & gear products for the aerospace, automotive, farm implement and mining industries.