S-90627A114 Length 1/2" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior holding power in plastic materials through advanced DST thread forming technology that creates strong, permanent threads without chips.
• Enhanced corrosion resistance with black zinc-plated steel construction for extended service life in various industrial environments.
• Reliable installation and removal with Phillips No. 1 drive that provides secure tool engagement and reduces cam-out risks.
• Full-length threading ensures maximum grip along the entire fastener length for superior load distribution in plastic assemblies.
• Optimized for plastic applications with blunt tip design that prevents material splitting while maintaining precise alignment.
• Standardized compatibility with No. 44 drill bits (0.086" diameter) for streamlined installation processes and reduced preparation time.
• Pan head design offers excellent bearing surface for secure fastening while maintaining a low-profile appearance.

Professional Applications & Engineering Value

These thread forming screws are specifically engineered to address common challenges in plastic fastening applications, where traditional fasteners often cause material stress, cracking, or stripping. The DST thread forming technology creates precise mating threads through material displacement rather than cutting, eliminating chips that can interfere with electronic components or moving parts in assemblies. The black zinc-plated steel construction provides essential corrosion protection for industrial environments while maintaining the mechanical strength required for durable plastic connections. With their fully threaded design and right-hand thread direction, these tapping screws ensure uniform stress distribution across the entire engagement length, preventing localized stress concentrations that can lead to plastic fatigue failure. The combination of Phillips drive and standardized pan head profile facilitates efficient installation in high-volume manufacturing settings where reliability and speed are critical.

Specification Summary & Compliance

These No. 4-24 x 1/2" thread forming screws feature precision Class 2A thread tolerances and comply with ASME B18.6.3 specifications for dimensional accuracy and performance reliability. The manufacturing process adheres to strict quality controls ensuring consistent thread diameter of 0.112" with approximately 24 threads per inch for optimal engagement in plastic materials. The screws are designed for use with standard No. 44 drill bits (0.086" diameter) and feature fully threaded construction with right-hand thread direction. Compliance with industry standards guarantees interchangeability and performance consistency across applications, while the black zinc-plated surface treatment meets common industrial requirements for corrosion protection.