求助：ANSI B1.1和ANSI B1.2有什么区别

各位好：

我手上有两套通止规，上面标的字样为

3/8-32UNEF-2A ANSI B1.2

3/8-32UNEF-2A ANSI B1.1/BS919

请问ANSI B1.1和ANSI B1.2有什么区别

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ASME B1.1-1989 Unified Inch Screw Threads (UN and UNR Thread Form)
ANSI/ASME B1.2-1983 Gages and Gaging for Unified Inch Screw Threads
BS 919-1: 1960 Specification For Screw Gauge Limits And Tolerance Part 1. Gauges for Screw Threads of Unified Form
BS 919-4: 1964 Specification For Screw Gauge Limits And Tolerance Part 4. Limits of Size for Gauges for Screw Threads of Unified Form Diameters 1/4 in and larger

ANSI B1.1是统一螺纹产品的标准
ANSI B1.2是统一螺纹量规的标准
BS 919是螺纹量规极限值和公差的规范
ANSI B1.2与BS 919之间的区别在于公差带不同，计算方法不同

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