The standard dictates the precise geometry for various head types to ensure driving tools fit perfectly without stripping. Covered designs include: Flat, oval, and undercut countersunk heads Pan, truss, and binding heads Hex and hex washer heads 2. Recess and Slot Dimensions
Small thread-forming screws secure printed circuit boards (PCBs) into plastic or aluminum housings.
Proper thread forming reduces the risk of stripping.
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Ensure that downloaded versions include any supplementary errata or active updates issued by the ASME B18 committee to guarantee compliance with modern global manufacturing baselines. asme b1864 pdf
ASME B18.64 provides detailed requirements for socket weld fittings, including:
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Minor variations in thread tolerance tables can cause cross-threading or stripping during automated assembly.
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. The standard dictates the precise geometry for various
The scope of ASME B18.64 includes:
: ASME standards are technically voluntary but are often mandated by law or contract in many engineering and construction sectors. Standards & Certification - FAQ - ASME
Precise head diameter, head height, body diameter, and length requirements.
: You can purchase and download the PDF or printed version directly from the ASME Standards & Certification page or the ASME Digital Collection Standards Aggregators : Sites such as IHS Markit/S&P Global Techstreet are licensed distributors of ASME standards. Library Access Proper thread forming reduces the risk of stripping
What you are fastening into (e.g., sheet metal, plastics, cast iron)? The head style or drive type required for your assembly? Any specific torque or load requirements you must meet?
Hex washer head tapping screws are the standard choice for sealing ductwork and sheet metal enclosures.
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