More about Acme Screws

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Acme screws are power fasteners with specialized threads that were developed more than 100 years ago. There are a number of Acme fasteners available, including threaded rods, studs and lead screws. The advantage of Acme screws is that their threads are wider and stronger than those of standard fasteners.

Acme threads have three standard forms: centralizing, stub and general purpose. The included angle for each type is 29 degrees, although certain thread forms have a 30-degree included angle. Within the category of general purpose Acme threads, there are three subdivisions, labeled 2G, 3G and 4G, which can be used interchangeably. Likewise, centralizing threads fall into three categories, 2C, 3C and 4C; older classifications also include the outdated 5C and 6C threads. Stub Acme threads are not categorized by class, and are instead represented by diameter and threads-per-inch. These threads are preferred in situations that call for a shallower depth than those of general purpose and centralizing Acme threads.

Materials used in Acme screws include stainless steel and other alloys. Nuts and other matching fasteners are available in a wide range of materials, including bronze, stainless steel and plastic. Each material is rated for a specific standard and dynamic load capacity, as well as the required driving torque needed to move a specific load. Screw length and column strength are also considerations for purchasers.

The Acme thread standards used by manufacturers were established in 1952. When installing screws, critical speed, pitch diameter and other important factors should be considered; users should refer to the appropriate materials for proper selection and use.