产品搜索
产品分类
- 国产斯托茨非标定制螺纹规
- GSG石油螺纹规│API量规
- GSG美制螺纹规│美标螺纹规
- GSG美国精密量规│进口量仪
- GSG螺纹指示规│螺纹量仪
- GSG美国倒角量规│锪孔量规
- GSG美国进口管螺纹量规
- API 5B石油管线管LP螺纹规
- API 5B石油套管短圆CSG螺纹规
- API 5B偏梯扣油管BCSG螺纹规
- API 5B油管TBG│UPTBG螺纹规
- API 7-2 数字型NC螺纹量规
- API 7-2 正规型REG螺纹量规
- API 7-2 贯眼型FH螺纹量规
- API 7-2 内平型IF螺纹量规
- Sharp Vee螺纹规(VR塞规)
- 背压阀HBPV螺纹规BPV塞规
- 海克斯康(Hexagon)测量仪器
- 苏州甪直三丰Mitutoyo量具
- 昆山德国Fischer菲希尔仪器
- 张家港英国易高Elcometer
- 江阴美国GE超声波探伤仪
- 无锡奥林巴斯超声波探伤仪
- 吴江英国GBIS超声波探头
- 太仓Spectronics无损检测
- 常熟Bruker布鲁克光谱仪
- 美国赛普斯SCIAPS光谱仪
- 镇江美国磁通Magnaflux
- Western Instrument仪器
- 嘉兴南通友联无损检测仪器
- 绍兴G.A.L. Gage焊接量规
- 宁波瑞士Maurer Magnetic
- 苏州标样│无损探伤试块
- 盐城建湖BAQ GmbH硬度计
- SIC MARKING西刻打标机
- Clark硬度计│Sun-Tec
- 日本future-tech硬度计
- 美国King便携式布氏硬度计
- 美国Rex Gauge邵氏硬度计
- 进口Ames便携式洛氏硬度计
- 美国Hemco螺纹规中国总代理
- PMC Lone Star石油量规
- Vermont螺纹规│VTG螺纹规
- GageAssembly螺纹规代理商
- Threadmaster进口螺纹规
- Westport螺纹规│硬度块
- Threadcheck螺纹规│三线规
- 美国Mueller Gage沟槽量仪
- 德国Kroeplin内外径卡规
- 美国环球Universal Punch
- 东莞DULIANG光学检测仪器
- 德国Schwenk进口内径量仪
- 宝石石油量规│API石油规
- 美国Allen Gauge单项仪
- Fowler 测量仪器│福勒量具
- 美国SPI通用测量量具
- Micro-Vu影像测量仪
- 苏州测量仪器MRO一站式供应商
National Pipe Thread vs Aeronautical National Pipe Thread
摘要:The requirements for NPT (National Pipe Taper) screw threads are spelled out in ANSI B1.20.1
The requirements for ANPT (Aeronautical National Pipe Taper) screw threads are spelled out in ANSI SAE AS71051
请问NPT、NPTF和ANPT螺纹的区别。NPT和NPTF的区别我已经知道了。我也知道ANPT叫美制管用耐密推拔螺纹,只是不知道具体的区别在哪里。
NPT vs ANPT
THREAD DESIGN

The requirements for NPT (National Pipe Taper) screw threads are spelled out in ANSI B1.20.1
The requirements for ANPT (Aeronautical National Pipe Taper) screw threads are spelled out in ANSI SAE AS71051
The NPT and ANPT product screw threads in the sizes up to and including 2 inches are identical. Beginning at 2-1/2 inches NPT and ANPT product screw threads are NOT identical. Beginning at 2-1/2 inches the wrenching length of the coupling is different between NPT and ANPT product screw threads. NPT has 2 threads and ANPT has 3 threads. There are major differences in the gages.
PRODUCT ASSEMBLY
NPT and ANPT screw threads are designed to screw together. In most cases there will be no interference between the root and crest of the threaded at assembly. The tapered screw thread is designed to be assembled with some form of sealant to assure a leak free joint.
NPTF screw threads will screw together with both NPT and ANPT screw threads and should have no noticeable assembly problem. There will most likely be an interference fit between the root and crest on either the major or minor diameter of the screw thread, depending on which part is NPTF. To accomplish a seal on the joint, a sealant will be required.
GAGE REQUIREMENTS
Both NPT and ANPT screw threads have a requirement for an L1 gage. The gage is called L1 because it relates to the L1 dimension in the screw thread specification. Even though the L1 requirement is identical for both NPT and ANPT product screw threads, the tapered pipe screw thread gages are different at either the major diameter or the minor diameter. From my quick survey of the two standards I found: the ANPT-L1 tapered pipe screw thread plug gage major diameter was larger than the NPT major diameter; the ANPT-L1 tapered pipe screw thread ring gage minor diameter was larger than the NPT minor diameter. All other L1 gage parameters are identical between the NPT-L1 and ANPT-L1 gages. Technically; the NPT-L1 and the ANPT-L1 gages are not fully interchangeable.
The NPT screw thread standard only defines a L1 ring gage for the male thread and a L1 plug gage for the female thread. Both gages measure the hand tight L1 length of the screw thread.
There are no such NPT tapered pipe screw thread gages: L2; L3 or 6-Step Crest Check. If you have NPT tapered pipe screw thread gages marked: L2; L3 or 6-Step Crest Check, they are really ANPT gages which have been inappropriately remarked to meet a customer's demand. The gage maker should have educated the customer instead of supplying the incorrectly marked taper pipe screw thread gages. If these inappropriately marked taper pipe screw thread gages were sent to a calibration laboratory, the calibration laboratory should return the gages without calibration because there is no standard which defines the gages.
If your NPT product design requirements indicate additional measurements must be taken, consider changing the product requirement to ANPT per ANSI SAE AS71051. Because the majority of the taper pipe screw thread applications will be 2 inches or less; and because the NPT and ANPT product screw threads in the sizes up to and including 2 inches are identical; this should present no problems with the end product. If your product is over 2-1/2 inches some design consideration should be conducted.
ANPT requires: both L1 and L2 ring gages for the male thread; both L1 and L3 plug gages for the female thread; and Crest Check (frequently called 6-step) gages for both the internal or external thread.
ANPT螺纹规的详细资料和技术资料,可以与我们直接联系,欢迎前来咨询, http://www.gsgage.com.cn
苏州斯文克精密测量设备有限公司专业代理美国GSG量规,美国进口ANPT螺纹规