We are the North American subsidiaries of Nihon Parkerizing Co., Ltd. (headquarter in Tokyo, Japan), the world leader in Meta ... l Improvement Technology. The Parker Trutec Group operates 6 facilities in the United States and Mexico which specialize in surface treatments that improve the resistance to wear, corrosion and fatigue of metal components. Heat Treating, ISONITE® Salt Bath Nitriding, ISONITE® QPQ Nitriding, Gas Carburizing / Carbonitriding, Gas Soft Nitriding, Neutral Hardening, Vibratory Polish, Shot Blasting, Centerless Buffing, Clamping Press read more