... button contacts, multi-layer contacts1.Products specification itemhead diameter D,mmhead thickness T,mmFace composite layer thickness S,mmTail ... diameter d,mmTail length L,mmTailcomposite layer thickness S,mmSpherical radius R,mmDemoulding angleDT SdLHSRangleBasic ... -protecting materials. function Tri-metal button contacts, multi-layer contacts has good electrical conductivity and its surface is ...