Nomenclature for screws

Nomenclature: Screw length_(LDu) x thread_diameter_(LDu) {head type} {slot type}

At present we have the following {head type}:
- Countersunk
- Pan
- Flat
- Beveled
Screw length is measured from the flat underside of the head, except for Countersunk when it is measured from the flat top surface.

At present we have the following {slot type}:
- Slotted
- Cruciform
- Triangular

Examples:
u9000.dat - ~Screw 44.5 x  5 Countersunk Slotted
u9013.dat - ~Screw 12 x  6 Pan Cruciform
u9021.dat - ~Screw  6 x  5 Flat Slotted
u9022.dat - ~Screw  4 x  4 Beveled Triangular
--Mikeheide 09:56, 10 July 2011 (EDT)