The door is wooden, but the door frame is metal (I found out when the screw wouldn't go in no matter how I hammered it). Is there a way to install a hasp to put padlock on? (Are there screw drivers for metal surfaces?) Or is there any other way to have the door locked without having to installing a cylinder lock?
You need to drill a hole first with a metal twist drill bit. Get a drill bit that is the same size as the screw shank (the solid part below the threads - the hole must be smaller than the diameter of the threads, so there is material for the threads to bite into), mark the location of the holes for the hasp on the frame, and drill the holes to the depth of the screws. Then attach the hasp.
I have been known to drill holes in the frame and use carriage bolts with locking nuts and locktite to hold it. I use carriage bolts so they can't be removed from the outside.
Either drill a pilot hole for the screws, or use a tek screw to drill the hole as you install it. Talk to the people at the hardware store. There are different head styles for the tek screws so you need to be careful. Also they are not designed for thick metal. If the frame is more than 10 ga, then drill and tap is preferred.
The metal door frame is heavy gauge steel. There are 2 ways to do this. #1. Purchase a 1/4-20 tap and a # 7 high speed steel drill bit. Mark the location of your holes for the hasp on the steel door frame. Drill holes with the #7 bit. Run the 1/4-20 tap into the hole slowly and straight - back out the tap after every couple of turns to clean out the holes. Keep running the tap in and out until you are all the way through the steel. Now purchase some 1/4-20 hex head machine screws and install in the holes. #2. Purchase some self drilling screws hex head ( these screws have a drill point on the end of them). You do not need to pre-drill holes for these screws. Simply run them in the hasp holes. Use like a #8 or #10 self drill screw with a hex head probably 3/16 or 1/4 hex head. This is the easiest of the two methods.
