Description of common screw specifications:
A. Slotted: a word (Minus)
B. Phillips cross (Plus)
Phil-Slot: a word/cross
D. Hex Socket: Hex Socket
E. One Way: One Way (only locked in and not out)
A-4: Head Code/Head appearance.
A. Flat: Flat head (after locked in, top with work piece)
B. Oval: salad head, O head, half head
C. Round, Round head
D. Pan: round and round head
E. Truss: large round flat head
F. Hex: hexagon head.
A-5: Finish Code/appearance processing.
Metric self-tapping screw: label the tap Type directly after the product name.
Ex: M3 x 6 -- PPB,Tapping Type:
M3 self-tapping screw, 6mm long, cross, round flat head, blackened.
The product is usually labeled as Sheet Metal or plastic.