这个标准涵盖塑料美国锥管螺纹(NPT)的尺寸和计量方法，用于泄漏密封连接，现在已在所有有关塑料管道产品的ASTM标准中引用。

The standard covers dimensions and gaging of plastic tapered National Pipe Threads (NPT) for leak-tight joints, and it is now referenced in all ASTM Standards for plastic piping products.

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最终得到的新型塑料合金轴承材料力学性能可达到或超过美国国防部颁布的MIL - B - 17901(船舶)军用标准。

Then the new material for BTG water lubrication plastic alloy bearings is get. Its mechanic capability should attain or exceeded MIL-B-17901B standard (shipping) issued by US DOD.

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