Ykk Corporation

Itaru Hasegawa

Kouta Kido

Takuya Koizumi

Kazuya Akitsu

Atsushi Ogihara

Yasuharu Yoshimura

Takahiro Fukuyama

Chikako Hiromi

Takanori Kumei

Yasuhara Yoshimura

Kyudo Ota

Yuri Katsumi

Kousuke Seki

Kentaro Yarino

A black metal fastener member can be manufactured at low cost. The fastener member comprises a base material made of a copper alloy containing zinc at a concentration of 30% by mass or more and 43% by mass or less, and a black copper oxide coating covering at least a part of the base material. The black copper oxide coating has a lower layer and an upper layer. The lower layer is a layer below a center line with respect to the thickness of the black copper oxide coating and the upper layer is a layer above the center line. The porosity of the lower layer is smaller than the porosity of the upper layer. In some cases, the difference between the porosity of the lower layer and the porosity of the upper layer is 10% or more.

Fastener member

An improved season cracking resistance of a metallic fastener member is provided and includes a copper alloy containing zinc as a base material. The metallic fastener member includes, as a base material, a copper alloy containing zinc, and the metallic fastener member has a surface to which a rust prevention treatment has been applied and has such a property that, when analyzed by a scanning X-ray photoelectron spectroscopy apparatus, a maximum value of an atomic concentration of Mn is detected at a depth of 100 nm or less from the surface.

Metallic fastener member and fastener equipped with same

A metallic fastener member has a specific color of light gold and also has high strength, discoloration resistance and high workability to withstand practical use. A metallic fastener member including a base material of a copper alloy having composition containing 1 to 30% by mass of Zn and 1 to 11% by mass of Ni, the balance being Cu and inevitable impurities, wherein the metallic fastener member has a Vickers hardness of Hv 120 or more and less than Hv 220.

Metallic fastener member having light gold color, and fastener provided therewith

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Toyama, Japan

Itaru Hasegawa