Axis Bank introduced the 'lock FD' feature, which allows you to add an extra layer of security to your investments. With this feature, you can lock your FD, after which the FD amount can't be withdrawn online. So, post FD lock, if you wish to close FD, visit the nearest Axis Bank branch.Steps to lock FD via Axis Bank mobile app (Open)For existing customers who already have invested their money in an Axis Bank FD, they need to follow the steps below to lock the FD online.1. Log in to the Open app using mPIN2. Go to the FD/RD section 3. Lock FD banner will appear on the screen4. Click on the banner and select the type of FD 5. In case you have multiple FDs with the bank, select the one you wish to lock6. Click on the 'Lock Selected FDs' button7. Now, enter your mPIN 8. Your FDs are lockedIf you're a new user and want to invest in Axis Bank FDs, you can also enable the 'lock FD' option at the time of creating the fixed deposit. Axis Bank offers fixed deposit rates ranging from 3.00% to 7.35% depending on the deposit amount and tenure. For amounts less than Rs 3 crore, the rates vary from 3.00% for short tenures to 6.60% for longer tenures, while amounts between Rs 3 crore and less than Rs 5 crore have slightly higher rates, reaching up to 7.35%.Axis Bank's 'lock FD' feature is optional, and you can use it to maximise the security of your deposit. Because once you lock FD, you can't withdraw funds prematurely from the FD account. So, enjoy the benefits of lock FD and secure your FD from any fraudulent activity. Besides the security feature, lock FD can also help you build a habit of savings, because after locking your FD, you can't withdraw funds from it. Either you need to visit the bank branch or close the FD offline.(Disclaimer: The above article is meant for informational purposes only, and should not be considered as any investment advice. ET NOW DIGITAL suggests its readers/audience to consult their financial advisors before making any money related decisions.)