The length of a bank card is 8.4CM, the width is 5.5CM, (54mm×85mm standard bank card size), and the thickness of a bank card is generally 0.76mm.

Generally speaking, except for some special-shaped cards, the sizes of bank cards in circulation at home and abroad are all the same. The specifications of the bank card are defined in the international standard ISO/IEC 7810: ID-1 standard, 85.60×53.98 mm (with a certain floating range), and the entire length-to-width ratio is 4:3.

The benefits of designing bank cards in the same size:

Firstly, it is convenient for cardholders to carry; secondly, ATM machines and POS machines can be designed for fixed bank card sizes, as long as they are opened With related services, you can use a card at ATMs and POS machines around the world; finally, it is also much more convenient for wallet manufacturers, as wallet designers can clearly design card slots.

: Bank card

Bank card refers to all or part of the credit card issued by commercial banks (including postal financial institutions) to the society with the functions of consumer credit, transfer settlement, cash deposit and withdrawal, etc. Functional credit payment tool. Bank cards reduce the circulation of cash and checks, allowing banking business to break through the limitations of time and space and undergo fundamental changes. The application of the bank card automatic settlement system has made the dream of a "checkless, cashless society" a reality.

Bank card classification:

1. Debit card:

Debit cards are divided into transfer cards, special cards and stored-value cards according to different functions. Debit cards cannot be overdrawn. Debit cards have the functions of transferring money, depositing and withdrawing cash, and spending money. A special card is a debit card used in a specific area and for special purposes (referring to purposes other than department stores, restaurants, and entertainment industries). It has the functions of transferring funds, depositing and withdrawing cash. A stored-value card is a prepaid wallet-style debit card in which the bank transfers funds to the card for storage at the request of the cardholder and directly deducts funds from the card during transactions.

2. Credit card:

Credit cards are divided into credit cards and quasi-credit cards. A credit card refers to a credit card in which the card-issuing bank gives the cardholder a certain credit limit, and the cardholder can consume within the credit limit first and repay later. A quasi-credit card refers to a credit card in which the cardholder first deposits a certain amount of reserve fund as required by the bank. When the reserve fund is insufficient to pay, the cardholder can overdraw within the credit limit specified by the card-issuing bank.