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4.1 General 4 Replacement Procedures
NB250/NB255 Maintenance Manual 4-7
Colors of Screw Shanks
For easy identification of the correct screws, the screw shanks are colored according to their
lengths, as follows:
Screws of an odd-numbered length Blue
Screws of a special length Black
(Screws of a special length are those of a length having decimal places, eg - 2.5 mm).
Symbols of Screws on the Laptop Body
For easy maintenance, the screw types are shown on the laptop body as symbols. A symbol
consists of a letter representing the screw type and a numeral representing the screw length.
Screw type Letter
Bind screw B (stands for bind)
Flat-head screw F (stands for flat-head)
Super flat-head screw S (stands for super flat-head)
Tapping screw T (stands for tapping)
Other screws U (stands for unique-pan head screws, studs, etc.)
Symbol examples
6 mm bind screw B6
12 mm bind screw B12
5 mm stud U5
(The numeral represents the rounded length of the threaded portion regardless of the
entire stud length.)