The 1N4001 is a standard recovery rectifier diode in a DO41 type package. Used for power protection, clipping, and more.
Standard Recovery Power Rectifier
Repetitive Reverse Voltage Max, Vrrm: 50V
Forward Current Avg Rectified, IF(AV): 1A
Forward Surge Current Max, Ifsm: 30A
Forward Voltage Max, VF: 1.1V
Current Rating: 1A
PLEASE NOTE: Never bend the leads in such a way as to apply any stress to the casing. Always use a heat sink when soldering.