Toshiba libretto U100 Maintenance Manual page 233

4.1 General
Grip Color
Some screws have a colored grip area to help you determine the length of the screw.
θ Even numbered length screws: Brown
θ Odd numbered length screws: White
θ Special length screw: Blue
"Special length screw" means screws whose length is indicated in an integral number to the
first decimal places such as 2.5 mm, 2.8 mm and so on.
Screw Notation
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.
Format:
Screw shape + Screw length (mm)
Screw shape
B: Bind screw
F: Flat head screw
S: Super flat head screw
T: Tapping screw
U: Other screws (Unique screws: pan head, stud, etc.)
Example: B6 ... 6mm bind screw
libretto U100 Maintenance Manual (960-520)
4 Replacement Procedures
[CONFIDENTIAL] 4-7