Toshiba Tecra M2-S519 Maintenance Manual - Page 221

4.1 General 4 Replacement Procedures Color of Screw Shaft To avoid mistakes on the screw length, screw shafts are colored as follows: ‰ Even number length screw: ‰ Odd number length screw: ‰ Special length screw: brown white blue 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 ‰ BIND screw ‰ FLAT HEAD screw ‰ SUPER FLAT HEAD screw ‰ TAPPING screw ‰ Other screws (Unique screws, STUD, etc.) Symbol B F S T U Examples: ‰ 6 mm BIND screw B6 ‰ 12 mm BIND screw B12 ‰ 4 mm FLAT HEAD screw F4 (Indicates the screwed length in round number regardless the length of the stud.) TECRA M2 Maintenance Manual (960-468) 4-7