NPSM , NPTF , NPT là tiêu chuẩn ren đường ống của mỹ (góc độ ren 60 độ ) & BSPT tiêu chuẩn ren ống của Anh (góc độ ren là 55độ )


NPT(National pipe tapered)   là tiêu chuẩn ren ống côn quốc gia  ANSI /ASME B1.20.1  dùng để bịt kín các loại đường ống chuyển chất lỏng và khí

NPTF(National pipe taper fuel)  là tiêu chuẩn ren nhiên liệu ống  quốc gia ANSI /ASME B1.20.3

Ren nhiên liệu ống côn quốc gia (NPTF), còn được gọi là ren ống côn tiêu chuẩn quốc gia Mỹ Dryseal, được định nghĩa bởi ASME B1.20.3, được thiết kế để mang lại khả năng bịt kín không bị rò rỉ,mà không cần sử dụng băng PTFE (còn gọi là “Teflon”) hoặc hơp chất bịt kín khác . Các Ren NPTF có hình dạng cơ bản giống nhau nhưng chiều cao đỉnh và gốc được điều chỉnh để khớp khít vơi nhau, loại bỏ được rò rỉ nhiên liệu qua đường xoắn ốc .

NPSM là tiêu chuẩn ren cơ khí  đường ống thẳng quốc gia  ANSI /ASME B1.20.1

Ren NPSM (Cơ khí ống thẳng quốc gia) cũng thường được tìm thấy trong các hệ thống chuyển chất lỏng.

BSTP  là tiêu chuẩn ren đường ống  của anh AS 1722.1 = BS 21 = ISO 7  góc độ ren là 55độ


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