絲口是一種連接方式，就是螺紋的意思，分內螺紋和外螺紋.

公稱壓力最高使用壓力試驗壓力（水壓）1.6MPA120℃以下水、油、瓦斯飽和蒸汽閥體閥座1.76MPA0.6MPA9.5MPA7MPA  Q11F-16P一片式INCH1/4″3/8″1/2″3/4″1″1 1/4″1 1/2″2″DN610152025324050L394456.558717883100H32.0534.543.5475560.574.580.5D579.212.5162024.532A70709090110110140140Q11F-16P二片式INCH1/2″3/4″1″1 1/4″1 1/2″2″    DN152025324050    L5566778798.5115    H475560.563.57887    D152025324050    A102125143143178178    Q11F-16P一片式INCH1/4″3/8″1/2″3/4″1″1 1/4″1 1/2″2″2 1/2″3″4″DN6101520253240506580100L394456.558717883100162182230H32.0534.543.5475560.574.580.5128137173D579.212.5162024.5326580100A70709090110110140140247247295