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- 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
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- 无锡奥林巴斯超声波探伤仪
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- Threadcheck螺纹规│三线规
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BSW and BSF Thread Gauges
Gauges for testing parallel threads having a full form Whitworth profile are manufactured to BS 84: 2007 and BS 919: Part 2: 2007.
BS 84 specifies basic information for the Whitworth form, and tabulates diameters for threads designated BSW and BSF.
BSW is a coarse thread series from 1/8" to 6" diameter.
BSF is a fine thread series from 3/16" to 3" diameter.

- Basic Form Whitworth Thread
- H = 0.960491p
- h=2/3H= 0.640327p
- H/6 = 0.160082p
- r = 0.137329p
Provision is made for three classes of fit for external threads. Close, Medium and Free and two classes for internal threads; Medium and Normal.
Close class applies to threads requiring a snug fit and is only used where there is a controlled accuracy of form and pitch. Medium class applies to better class interchangeable threads. Free and Normal classes apply to the majority of commercial quality threads.
Unless otherwise specified by the customer, gauges for all internal and external product threads are made to the basic sizes as specified in BS 84, with the exception of Medium and Free fit bolts up to and including 3/4” diameter. These have a plating allowance, the magnitude of which is dependant on diameter and pitch.
BS919: Pt 2: 2007 specifies the limits for gauges with threads having a full form profile.
The gauge limits are dependant upon the diameter/pitch. Generally, the larger the diameter, the larger the limit within defined bands.
The types of gauge which are recommended to be used are similar to those used for ISO and Unified threads, with the exception that the Go plugs and Go rings test the major, effective and minor diameters of the product threads (Maximum material limit). The No Go gauges test the effective diameter only.