到2A螺纹之表面处理之适用性但3A螺纹因为没有配合公差所以表面处理时必需特别小心以免造成无法组合
高温状况
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当紧固件长其暴露在高温通常在500度F以上时就必需加大配合公差以避免磨损情形发生
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表1螺纹强度面积表
尺寸螺纹距螺纹系列
As
抗拉强度面积平方寸
080UNF164UNC172UNF256UNC264UNF348UNC356UNF440UNC448UNF540UNC544UNF632UNC640UNF832UNC836UNF1024UNC1032UNF1224UNC1228UNF1420UNC1428UNF51618UNC51624UNF
00018000026300027800037000039400048700052300060400066100079600083000090900101500140001470017500200002420025800318003640052400580
Ar
抗剪应力面积平方寸
00015100021800023700031000033900040600045100049600056600067200071600074500087400120001280014500175002060022600269003260045400524
ASs
As

抗松应力面积
平方寸寸
外螺纹
内螺纹
2A
3A
2B
3B
006030074801060116
008350091301330144
008310092201300142
0101010901620174
0101010901560170
0118012701910204
0118013001860201
0138014702210235
0140015102160232
0161017202480263
0162017302460262
0180018902810296
0182019702740292
0226023903340353
0227024403310350
0263027704010420
0275028903890411
0312032704580478
03170368
03360385
04500539
04740563
0373040305210549
0470050206820710
0479052006630696
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尺寸螺纹距螺纹系列
As
抗拉强度面积平方寸
3816UNC3824UNF71614UNC71620UNF1213UNC1213UNF91612UNC91618UNF5811UNC5818UNF3410UNC3416UNF789UNC7814UNF
18UNC112UNF114UNS1187r