To provide a screw parts for easy disassembly improving fastening reliability by enabling to distinguish at a glance from an outside that size is different and preventing error of kind.
This screw parts for easy disassembly includes a head part 12, a stepped part 14 of a smaller diameter than the head part 12, and a screw part 16 smaller diameter than the stepped part 14 in an order in an axial direction, and fixes a panel cover 33 on a panel base 30 via a spacer 22 built in surrounding of the stepped part 14 and restoring in an original shape and opening larger than outer diameter of the head part by heating. Axial length L1 from a lower end of the stepped part 14 to an upper end is determined with corresponding to dimension adding thickness of the panel cover 33 and thickness t of the spacer 22. An identification mark enabling to distinguish difference of axial length L1 of the stepped part 14 is formed on the head part 12 and/or the stepped part 14. The identification mark is a dimple and/or knurling mesh 19.
TANIGAWA MASANOBU
SUGIYAMA KAZUO
TAJIMA TADASHI
YOSHIDA KAZUYA
TAKAARA HIDEO
UNION SEIMITSU KK
UNIV TOKAI
NEC TOKIN CORP
Hiroshi Ochi
Sadao Matsumura
Isamu Kakiuchi