DIN (mm) ANSI B16.5 BS1560 (mm) Mss sp-44 API 605 公差 內環內徑 墊片內徑 <=600 <=24" >=26" and <=34" ±0.5 >600 and <=800 >24" and <=34" >=36" and <=60" ±0.9 >800 and <=1600 >34" and <=60" ±1.3 >1600 >60" ±1.6 墊片外徑 <=600 <=24" <=24" ±0.9 >600 and <=160000 >24" and <=60" >24" and <=60" ±1.8 1600 >60" ±2.2 外環外徑 >=1/2" and <=60" ±0.9 <=600 <=24" 0-1.0 >600 and <=1000 >24" and <=34" 0-1.8 >1000 and <=1600 >34" and <=60" 0-2.2