ACME and Trapezoidal thread gauge are common names in the market. They may seem similar but their uses are quite different. Gauges are generally used to measure the pitch and the lead of a threaded instrument. It is said that until the 1800s the square threads were in use. But, due to its drawbacks, the ACME thread gauges were manufactured and it came into existence. Trapezoidal thread forms are screw thread profiles with trapezoidal outlines. They are the most common forms used for leadscrews. They offer high strength and ease of manufacture. So, how exactly is the ACME thread gauge different from the Trapezoid Thread gauges? Well, they may seem to appear similar to each other. But, here are a few differences:

The ACME Thread Gauge:

The American ACME form has an included flank angle of 29-degrees. American Acme thread-form is used and accepted throughout the world. Acme diameters and pitches were established, all with Imperial Inches in diameter and Threads-per-Inch units of description. The Acme threads are used in precision instruments. Hence, you need precision tools to evaluate and determine its tolerance levels. The best tools for the purpose are ACME thread gauges.

The Trapezoidal Thread Gauge:

The Trapezoidal Thread Gauge flank angle is at 30-degrees. The European industries use the trapezoidal threaded forms more than the ACME threads. Metric standard trapezoidal threads are covered under DIN103. Diameter and pitch descriptions are in metric units of measure. These threads are also used in lead screws and other pivotal instruments. These threads have to be strong as well. You need a special gauge to measure the pitch of these trapezoidal threaded screws.

There is no much difference in the tool in itself. But they are important in their own ways. Here are a few similarities between the two thread gauges:

Both thread forms serve the purpose of producing linear motion when rotated, usually under heavy load. Some common uses include; lead screws for linear actuation on CNC machinery, table lifts, clamps and vises, valve stems, medical diagnostic device drives, trailer jacks and jack-stands. There were two problems with square threads, however. The threads were difficult to manufacture with the technology available at the time, and they tended to be weak. In order to overcome these shortcomings, the ACME thread gauge was produced in the US. Similarly, a new gauge was produced in Europe with mild changes, which came to be known as the Trapezoidal Thread Gauge.

Always have a professional pick the most appropriate gauge for you. In case you don't find a good local dealer, try buying these thread gauges online that are manufactured and sold by professionals. These are the basic differences and the similarities between the two thread gauges. So, do not get confused and do understand that they are unique in many ways. They are not the same.

Contact :

Chenchuan Tools Co.,LTD
Chenbei Industry Zone,
Longgang Road,
China, 435202
Phone     0714-7321211
Fax     0714-7321210