ACME是英制螺纹的一种，包括一般用途的和定心的两种配合的梯形螺纹，其中一般用途者与我国标准GB/T5796-1986规定的梯形螺纹的性能相类同。

ACME螺纹的国别及标准号为美国标准ANSI B1.5，是牙型角为29°的英制传动螺纹。

英制螺纹是螺纹尺寸用英制标注，按外形分圆柱、圆锥两种；按牙型角分55°、60°两种。螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径，单位是英寸。一英寸等于8分，1/4 英寸就是2分，如此类推。

 standard and special General Purpose Acme Thread Gages per ASME B1.5 - 1997. Acme Thread Gauges are used to gage internal and external threaded product. Acme Thread Gages are priced on request. The following list of diameters and associated pitches are recommended as preferred. The threads below have been specifically selected to meet requirements with the least number of items in order to keep to a minimum the inventory of gages and tooling. Other size combinations including multiple start threads, centralizing threads, Stub Acme, Centralized Stub Acme, 60 degree Stub and diameters over 5.0 inches can be priced on request. Acme General Purpose threads have 3 classes of fit - 2G, 3G, and 4G.

General Purpose Threads class 2G, 3G, and 4G are designed with clearance on all diameter which enables free movement. General Purpose These threads are ideal for assemblies where the internal thread is rigidly fixed and the external thread moves perpendicular to its axis. It is recommended that threads of the same class should be assembled together. Class 2G is the most popular thread class of fit. Class 3G and 4G should be used if less backlash is required.

Centralizing Acme thread gauges are designated by the letter C and the classes of fit are designated as 2C, 3C, and 4C.

Other types of threads are Stub Acme and Centralizing Stub Acme.

All Acme threads have a 29 degree included angle.

The abbreviations listed below are recommended for correct thread nomenclature on gages, tools and drawings.

ACME = ACME Threads
G=General Purpose
C=Centralizing
P=Pitch
L=Lead
LH=Left Hand

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