- ABB-ABL Ltd., Chennai
- ACC-Bobcock, Chennai
- ACC-Bobcock, Gulbarga
- Asea Brown Boveri Ltd., Bangalore
- Best & Crompton Ltd., Chennai
- Bharat Electronics Ltd., Chennai
- Bharat Heavy Electricals Ltd., Bangalore
- Bharat Heavy Electricals Ltd, Hyderabad
- Britannia Industries, Chennai.
- Carburettors Ltd., Maraimalai Nagar.
- Combat Vehicles Research & Development Establishment, Avadi
- Chemfab Alkalis, Pondichery
- Chemfab Chlorates, Pondichery
- Dharangadhara Chemicals Works, Arumuganeri
- Dalmia Cements, Dalmiapuram.
- Hindustan Latex Ltd., Trivandrum
- Indian Drugs and Pharmaceuticals Ltd., Chennai.
- Indian Organic Chemicals Ltd., Chennai
- Instrumentation Ltd., Bhilai
- Instrumentation Ltd. Chennai.
- Instrumentation Ltd. Kota
- Ispat Metallic India Ltd
- J & H Controls, Chennai
- Lucas TVS Ltd., Chennai
- Lakshmi Machine Works Ltd., Coimbatore
- Mettur Chemicals & Industrial Corporation, Mettur Dam
- Madura Coates, Chalakudi
- Madura Coats, Tuticorin
- Madras Fertilizers Ltd., Chennai
- Mecon, Chennai
- National Carbon Co. Chennai
- National Thermal Power Station, Ramagundam
- Neyveli Lignite Corporation Ltd., Neyveli
- Rashtriya Ispat Nigam Ltd ,Vishakapatnam Steel Plant
- South India Viscose Ltd., Coimbatore.
- Steel Authority of India , Bhilai Steel Plant
- Steel Authority of India , Bokaro Steel Plant
- Steel Authority of India , Durgapur Steel Plant
- Steel Authority of India , Rourkela Steel Plant
- Steel Authority of India , R&D Centre for Iron & Steel, Ranchi
- Sundaram Clayton Ltd., Chennai.
- Sundaram Fasteners, Chennai
- Titanium Equipment and Anode Manufacturer Ltd., Vandalur.
- Tuticorin Alkalis & Chemicals, Tuticorin.
- Taminadu News Print & Papers Ltd., Khagithapuram
- Tuticorin Thermal Power Station, Tuticorin.
- Tube Proucts, Chennai.
- TI Diamond Chain, Chennai
- WS Industries, Chennai.
- Wavin Industries, Chennai
- Zip Industries, Chengalpattu.
