Determine the security level you need
Choose the correct shackle size and clearance
Select the right shackle material and thickness
Pick a lock body material that matches the environment
Decide between keyed, combination, or smart access
Check for weather resistance if used outdoors
Look for anti-pick, anti-drill, and anti-shim features
Verify compatibility with the hasp, chain, or latch
Consider rekeyable or master-keyed options
Compare brand reputation and warranty
Match the padlock to the value of what you are securing
Test ease of use with your keys or code
Ensure the lock meets any required standards or certifications