六角头机械塑料螺丝-全牙(公英制）具备优异的绝缘性能，无磁性，隔热，重量轻，个别材料的塑料螺丝还具备耐高温，高强度，耐腐蚀性能，广泛应用于各工业领域。
也称为六角头螺丝或六角头螺栓。包括标准，钻孔头，左旋螺，自封式，军用规格螺栓。
Also known as Hex Head Screws or Hex Head Bolts. Includes Standard, Drilled Head, Left Hand Threaded, Self-Sealing, and Military Specification Cap Screws.
注意：如果只是维修阀瓣，就不要拆卸阀瓣固定器，只需拆卸支撑阀瓣固定器板的六角头螺丝和拆卸阀瓣即可。
NOTE: the disc holder should not be removed when servicing only the disc, remove Allen head screws holding the disc retaining plate and replace disc.
沉头内六角螺丝；
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