My guess is a 10 24 round head screw 1 1 4 long.
Screws used in door handle.
The hardware on passage knobs and levers is for use on doors that do not require privacy or security.
The head may be too big to fit in the recess since it will not be the original screws.
Do not get them too long or the screw will bottom out before the handle is drawn tight.
Will a 10 x 32t work.
As long as your door is only 1 3 8 it can be 1 2 shorter.
These slotted 5 16 24 set screws are used with vintage style door knobs mounted on threaded spindles.
Passage door knobs and door levers.
Handle set screw package for a series hinged and outswing patio doors and 400 series frenchwood hinged and frenchwood outswing patio doors.
Made of brass plated steel.
Used on all hardware styles.
Package includes 4 1 4 20 unc knurled cup point set screws and 1 1 8 allen wrench replacement set screw finish may not match original.
The screws are a bit tired and i d like to replace them and i d prefer not messing them up.
So is the screw size for the door handle the 2 phillips heads that screw into the handle from the edge of the door and the inside really some obsolete 3 16 size.
The screw threads through the knob shank and tightens directly onto the spindle not to be confused with headed set screws used for tightening knobs onto tapped spindles.