Toshiba PORTEGE M780 Maintenance Manual page 318

4.1 Overview
Grip Color
Some screws have a colored grip area to help you determine the length of the screw.
 Even numbered length screws: Brown
 Odd numbered length screws: White
 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, 2.6 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 type + Screw length (mm)
Screw type
Example: B6 ... 6mm Bind screw
Screw color/material
PORTÉGÉ M780 Maintenance Manual (960-809)
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B: Bind screw
F: Flat head screw
S: Super thin head screw
T: Tapping screw
U: Other screws (Unique screws: pan head, stud, etc.)
B: Black/Nickel
C: Silver/Non-Hexavalent Chromate
U: Other screws (Unique screws: such as stud, etc.)
4 Replacement Procedures
Grip area
[CONFIDENTIAL] 4-9