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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标准B2.4 -这个标准控制美国尼必可软管连接螺丝螺纹。

A. N. s. I. standard b2.4-this standard controls NIBCO hose coupling screw threads.

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直到最近，这些标准涵盖PV C (D - 2464)和CPVC (F - 437)目录80螺纹压力连接件。

Until recently, these standards covered PVC (D-2464) and CPVC (F-437) Schedule 80 threaded pressure fitting.

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