By Type
By Series
If you are a design engineer, procurement specialist, or manufacturer, understanding this standard is essential. This article provides a comprehensive overview of the standard, its key components, and its role in modern industry. What is the ASME B18.6.4 Standard?
These screws displace material rather than cutting it, generating a mating thread through plastic deformation. They are ideal for applications requiring high vibration resistance, as the material naturally compresses around the screw.
Fasteners featuring cutting edges or slots that physically remove material to cut a clean thread path.
The standard covers various slotted and recessed head styles, including: Flat Countersunk (80°–82°) Oval Countersunk Hex and Hex Washer Head 2. Recess Designs
Covers dimensions, types, and head styles for tapping screws. asme b1864 pdf
: Specifies requirements for materials such as steel (often quenched and tempered) and various grades of stainless steel, such as AISI 410 . Technical Specifications
Many engineering firms and universities provide free database access (e.g., via IEEE Xplore or institutional subscriptions) to employees and students.
The B18.6.4 standard defines specific recess types to ensure compatibility with driver bits, such as Type I (Phillips) and Type II (though Type II was removed in later revisions due to lack of use). 3. Thread Types
When working with fastening solutions in industrial, manufacturing, or construction environments, selecting the correct screw standard is critical to structural integrity. is a primary standard covering thread-forming and thread-cutting tapping screws, as well as metallic drive screws. If you are a design engineer, procurement specialist,
As with most engineering codes, a free PDF of the complete, authoritative ASME B18.6.4 standard is not legally available. It is a copyrighted publication that must be purchased. Here's how to acquire it:
Defines the dimensions of Phillips or other drive recesses to ensure proper tool engagement. 4. Appendix and Technical Data
The standard is a critical technical document established by the American Society of Mechanical Engineers (ASME) that provides comprehensive dimensional and general data for tapping screws and metallic drive screws. Purpose and Scope
The table below summarizes the key differences: These screws displace material rather than cutting it,
Material hardness (Rockwell C45 min for steel), case depth, and heat treatment protocols. ANSI B18.6.4 Self Tapping Drive Screws (Type U)
Tapping screws are categorized by letter designations that dictate their thread pitch and point geometry. ASME B18.6.4 standardizes these designations, including:
An authorized distributor of American National Standards.