Engineering guides
Reference tables for specifying a custom turned part: the shaft fits, keyseats, threads, and surface finishes we cut to. Every value on these pages is one the configurator applies when you build a part, so the reference and the finished part agree.
Computed upper and lower limits for the common shaft fit classes, f7 and g6 through k5, n6, and p6, across the diameters we turn, with guidance on clearance, transition, and interference fits for bearing, seal, and coupling seats. Open the fits guide →
Square parallel key and keyseat sizes by shaft diameter: key cross-section, keyseat width, and the cut depth we use, plus end versus captivated keyseats and how the key length is chosen. Open the keyseat guide →
UNC and UNF major and minor diameters, threads per inch, and tap-drill sizes, plus Acme power-thread basics, for threaded shaft ends, tapped holes, and studs. Open the thread guide →
The roughness each process reaches and the finish targets we hold on bearing seats, seal journals, and bushing surfaces, with how to read an Ra callout against a diameter tolerance. Open the finish guide →
Specifying the material too? See the per-grade materials guides and the shop capabilities and specs.