Toshiba A20-S259 - Satellite - Pentium 4 2.66 GHz Maintenance Manual page 218

4 Replacement Procedures
Color of Screw Shaft
To avoid mistakes on the screw length, screw shafts are colored as follows:
q Even number length screw:
q Odd number length screw:
q Special length screw:
Screws whose lengths are indicated to one or more decimal places such as 2.5 mm or 2.8
mm.
Marking of Screws on the Computer Body
To make maintenance of the computer easier, markings of the kinds of the screws including the
types and lengths of the screws are indicated on the computer body.
Kind of screws
q BIND screw
q FLAT HEAD screw
q SUPER FLAT HEAD screw
q TAPPING screw
q Other screws
(Unique screws, STUD, etc.)
Examples:
q 6 mm BIND screw
q 12 mm BIND screw
q 5 mm FLAT HEAD screw
q (Indicates the screwed length in round number regardless the length of the stud.)
4-8
brown
white
blue
Symbol
B
F
S
T
U
B6
B12
F5
Satellite A20 Maintenance Manual (960-444)
4.1 General