Some of the Precision Parts Ground by Cowan Precision Grinding 13-8MO Stainless Steel Ground O.D.s and I.D. Post Inside Sector .±0002” 440c Stainless Steel All O.D.s Plunge Ground in Two Operations Using Diamond Roll Technique 9310 Aircraft Alloy Steel I.D., O.D. & Face Ground 15-5 Stainless Steel Hard Chrome Plated 17-4 Stainless Steel Hard Chrome Plated Diameters & Flange Face Require 6/8 Microfinish Niralloy 135TM Nitriding Steel Six I.D. Grinds & Three O.D. Grinds in Two Setups 15-5 Stainless Steel Hard Chrome Plated A-2 Tool Steel Tolerance on Taper to Face .0001” 9310 Aircraft Alloy Steel Hard Chrome Plated & Gold Plated 15-5 Stainless Steel Hard Chrome Plated / Electron-Beam Welded 17-4PH Stainless Steel 304 Stainless Steel Casting Hard Chrome Plated I.D. 9310 Aircraft Alloy Steel Hard Chrome Plated 15-5 Stainless Steel Hard Chrome Plated 440c Stainless Steel Extreme Stock Removal 9310 Aircraft Alloy Steel Seven Grinds Done in Two Setups .0003” Tolerance / .0003“ T.I.R. ± .001 Linear Dimensions 440C Stainless Steel Ground Nose Raidus & O.D. Between Centers with 8 Microfinish 416 Stainless Steel Ground within .0005 T.I.R. Extremely Flimsy Part 15-5 Stainless Steel 9310 Aircraft Alloy Steel I.D. & O.D. Grinding .0002” Tolerance / .0003 T.I.R.