SA-210C內(nèi)螺紋管的尺寸及螺紋參數(shù)允許偏差
代號 |
項目 |
“A”型齒型允許偏差 |
“B”型齒型允許偏差 |
A |
外徑≤38.1mm
38.1mm<外徑<50.8mm
50.8<外徑<63.5mm
外徑≥63.5mm |
±0.15mm
±0.20mm
±0.25mm
±0.30mm |
--- |
B |
外徑≤38.1mm
38.1mm<外徑<50.8mm
50.8<外徑<63.5mm
外徑≥63.5mm |
--- |
±0.15mm
±0.20mm
±0.25mm
±0.30mm |
C |
螺紋根部內(nèi)徑:
外徑-(1.11×最小壁厚×2)
外徑≤38.1mm
38.1mm<外徑<50.8mm
50.8<外徑<63.5mm
外徑≥63.5mm |
±0.15mm
±0.20mm
±0.25mm
±0.30mm |
±0.15mm
±0.20mm
±0.25mm
±0.30mm |
E |
最小內(nèi)徑 |
負偏差為0 |
負偏差為0 |
F |
最小壁厚 |
﹢22%
0 |
﹢22%
0 |
G |
螺紋頭數(shù) |
--- |
--- |
I |
螺紋頂寬(周向): |
--- |
--- |
J |
螺紋高度:
外徑≤38.1mm
38.1mm<外徑<50.8mm
50.8<外徑<63.5mm
外徑≥63.5mm |
±0.3mm |
±0.18mm
±0.20mm
±0.23mm
±0.28mm |
K |
螺紋側(cè)邊角度 |
±15° |
±15° |
O |
螺紋根部圓角半徑 |
--- |
--- |
M |
螺紋節(jié)距 |
±3.2mm |
±3.2mm |
N |
螺紋導程 |
±3.2mm×螺紋頭數(shù) |
±3.2mm×螺紋頭數(shù) |
Qb |
螺旋升角 |
額定值 |
額定值 |
T |
螺紋頂寬(軸向) |
±1.3mm |
±1.3mm |
U |
螺紋頂部(軸向)槽寬 |
--- |
--- |
a 對“B”型齒型,任何一個螺紋高度的最大偏差可超出表中規(guī)定的允許偏差值,但不應(yīng)超出允許偏差0.08mm,且所有螺紋的平均高度應(yīng)符合所給出的偏差范圍。
b 額定值是以管子的軸線為基準。 |