These are the screws that fit our Machined pocket clip and both our TiButton® and NottaBolt® pen. These precision screws are custom made out of 6AL4V Titanium. 
The current inventory shown here is from Steve Kelly at TiConnector, who has been our supplier for years
They are machined for a T-8 Torx and are a 2-56 thread with a diameter of .140 and height of .045 

Price is per screw.