A back flap hinge is a flat steel hinge with two wide plates. The plates are called flaps. People use it on cupboard doors, boxes, table tops and wooden doors. If a hinge is made badly, it bends, gets rust or does not move smoothly. This is why India has a quality rule for it. The rule is called IS 3843:1995. It is made by the Bureau of Indian Standards, also called BIS. It talks about two kinds of back flap hinges, light weight and heavy weight. Both are made of mild steel. The rule tells makers which steel to use, what size to follow and how the hinge should look and feel. BIS certification for steel back flap hinges is a must in India. This is a government rule. You cannot make and sell these hinges without a BIS licence and the ISI Mark. If you sell without it, you can pay a fine and lose your stock. What does BIS check? BIS checks the steel, the size, the finish and the pin of the hinge. It also checks that the hinge opens and closes freely. The checking is done in a lab that BIS has approved. This is how a maker gets the BIS licence for steel back flap hinges: Step 1: Collect your company, factory and product papers. Step 2: Apply online and pay the fees. Step 3: A BIS officer comes to your factory. Step 4: Your samples are tested in a lab. Step 5: BIS checks everything and gives you the license. In India, this usually takes 30 to 45 days if your papers are ready. Papers you may need: Business proof, factory address proof, list of machines, product details and details of your testing tools. Makers from other countries also need a helper in India. BIS also has a guide for this hinge. It is called a product manual. It tells you which tests to do in your own factory and what records to keep. Read it before you apply. Common mistakes: Wrong or old papers, steel that does not match the rule, and samples that are not made in regular work. EVTL India is one of the leading BIS Consultant in India, helping manufacturers obtain their BIS licenses hassle-free. Our team explains each step in easy words and stays with you until the license is in your hands.