O O-RING Occlusion OCTG OD Oddsides Off Center Off Gauge Off Gauge Reel Off Iron Off Line Off-Dimension Off-Gage (Off-Size) Off-Grade Metal Off-Size Offset Offset Dial Offsetting Oil and Whiting Test Oil Cooler Oil Core or Mold Oil Country Tubular Goods (OCTG) Oil Film Weight Oil Hardening Oil Hardening Steel Oil Quenching Oil Sample Oil Sands Oil Shot Oil Stain Aluminum Oil Stones Oil Test Oil-Hardening Steel Oil-Oxygen Binder (Cold-Setting, Air-Setting Binders) Oiled Oiling OIT Old Blowing Room Oleoresinous Olive Olsen (Ductility) Test On Cast On Check On Line Term One-Piece Pattern One-Screen One-Side Bright Mill Finish OPEB Expense Open Die Forging Open Face Mold Open Flame Furnace Open Grain Structure Open Hearth Furnace Open Hearth Line Open Line OPEN LOOP Open Riser Open Sand Casting Open Surface Open-Hearth Furnace Open-Hearth Process Openhearth Furnace OPERATING PRESSURE Operating Rates Operator Side Optical Pyrometer Optimum Moisture Options Orange Peel Orange Peel (effect) Orange Peel Bucket OrCAD Software Order Matte Order Rate Ore Ore 2 Organosol Orientation (crystal) Orientation (crystal) 2 Oriffice Oriffice Plate ORIFICE Orifice Flange Os Oscillate Wound/Ribbon Wound Oscillated Wound or Scroll Wound Oscillating Oscillating Trough Cooler Osmium Osmondite Ottowa Sand Out of Register Outboard Bearing Outlet OUTPUT STAGE Oval Ovality Oven, Drying Ovens Overaging Overaging 2 Overaging 3 Overaging 4 Overarm Overfill Overfiring Overflows (Overflow Wells) Overhand Overhead Magnets Overhead Separators Overheated Overheating Overheating 2 Overheating 3 OVERLAP Overpickled OVERSHOOT Overspeed Trip Overspeed Trip Switch Overstressing Overwidth Overwind Overwrap Owen Jet Dust Counter OXIDATION Oxidation 2 Oxidation Losses Oxide Oxide Discoloration Oxidized Surface Oxidizing Atmosphere Oxy-Acetylene Welding Oxygen Oxygen Blow Oxygen Bomb Calorimeter Oxygen Impingement Process Oxygen Lance Oxygen-Free Copper
