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What is an ACME tap?
• Create ACME threads (trapezoidal in shape)
• Stronger than similarly sized square threads
• They allow rotation or transversing movement on equipment that carries heavy loads
• Common applications include: jacks, valves, and presses
• Tandem Acme Thread Spiral Flute Taps are designed with a roughing and finishing section to produce threads in a single pass eliminating the need for a leadscrew.
THREADING; ACME THREADS:
The uses of Acme Threads usually involve special designs so each tapping job becomes a minor engineering project of its own. The inherent exactness in application of Acme taps makes close coordination between manufacturer and user particularly important.
American Standard Acme Threads are used to produce traversing motion in valves and other power transmission mechanisms requiring high strength and free movement over long periods of operation.
American Standard General Purpose Acme Thread: Provides clearance of all points of contact between external and internal surfaces for free movement. Normally these applications are indicated with a Class of Fit symbols of “2G”, “3G”, or “4G”. The numbers 2,3, and 4 will control the amount of backlash allowed. Included flank angle is 29°.
American Standard Centralizing Acme Threads: Clearance at pitch and minor diameters, with limited clearance at major diameter so that alignment of screw and nut is controlled. The class of fit symbols here are indicated with “2C”, “3C”, and “4C”. Included flank angle is 29°
Stub Acme: Stub Acme are similar to General Purpose Acme but are used where coarse pitch thread of shallow height is required. Included flank angle is 29°.
60° Stub Threads: May be substituted where axial leads do not require the smaller flank angle; and applications where shallow thread height is required as on fitting-up bolts and nuts. Included flank angle is 60°.
Modified Square Threads: An equivalent to Square Threads for all practical considerations; but they should not be used where Acme Threads can serve the same purpose. Modified Square Threads have 10° included flank angles.
Acme thread’s block like profile requires a large amount of material be cut and removed. Chip load becomes a major factor and must be controlled.
Taps are furnished in normally two types for most of the above. Sets include either one or two roughers and a finisher. Single pass tandem taps can also be designed with the roughing section built ahead of the finishing section on the same body.
How to Buy
Special Acme Taps and other translating thread taps can be made to your requirements. Fill out the Special Tool Form to receive your free quote.
If you need a quantity <6 and then you might want to consider our ordering one of our Spot-Buy Packages instead, which offers a low fixed cost on specials.
