介子；垫片 washer

    介指铁 ring mandrel

    介电常数；电容率 permittivity

    介稳态的；亚稳态的 metastable

    内力 internal force

    内卡尺 inside calipers

    内能 internal energy

    内涵性质 intensive properties

    内圆弯凿 scribing gouge

    内锁式配件 interlocking fitting

    内燃机 internal combustion engine

    内螺纹制造法 tapping

    内螺丝 internal thread

    内弯边 concave edge

    六角金属枝 hexagonal bar

    六角匙 Allen key

    六角头螺丝 hexagonal head screw

    公制的；十进制的 metric

    公差 tolerance

    冗余构件 redundant member

    分力 component force

    分子 molecule

    分子力 molecular force

    分切；分割；切断 parting off