Dimensional accuracy is useless without material strength. ASME B18.6.4 defines:
Beyond dimensions, the standard specifies the physical performance criteria that these fasteners must meet. This includes:
: Deep dives into Type AB, Type B, Type BP, and Type C threads, which are designed to create their own mating threads in materials like plastic or thin metal.
ASME B18.64 is an important standard for several reasons: asme b1864 pdf
A review of the official ASME catalog reveals no active standard with the number B1864. The only active standard from ASME with a similar nomenclature is , which covers "Thread Forming and Thread Cutting Tapping Screws and Metallic Drive Screws, Inch Series". A quick look at the titles of well-known ASME collections, such as the B16 Series of standards for pipe flanges and fittings or the B18 Series for fasteners , reveals no document matching B1864.
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:
If your work involves cutting, gauging, or inspecting pipe threads, the standard you need is . Dimensional accuracy is useless without material strength
If you'd like me to compare specific screw types from this standard (like Type A vs Type B), or if you need help finding technical specs for a particular head style, Share public link
The standard categorizes screws not only by head style but, more critically, by the geometry of the thread and point. This geometry dictates the screw's interaction with the host material.
Sharp-pointed screws with coarse threads for pre-drilled sheet metal. ASME B18
Standardized drive sizes reduce operator errors.
Some key features of ASME B18.64 include:
These displace material around the pilot hole to form threads without generating chips.
: Requirements for steel and stainless steel variants, including heat treatment processes to achieve necessary surface hardness (e.g., Rockwell C45 minimum). ASME B18.6.4 Tapping Screws Standard | PDF - Scribd