S-90283A103 4-40 x 1/8" ASME B18.6.3 Steel Pan Head Slotted Screws
Steel Pan Head Slotted Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
- High tensile strength of 60,000 psi ensures reliable fastening under substantial mechanical loads
- Rockwell B60 hardness provides excellent durability and resistance to wear during installation and use
- Class 2A thread fit with UNC coarse threading enables quick assembly and reduces cross-threading risks
- Fully threaded design offers maximum grip and consistent holding power along the entire length
- Slotted pan head design allows for easy installation with standard screwdrivers in confined spaces
- Compliance with ASME B18.6.3, RoHS, and REACH guarantees quality assurance and environmental safety for industrial procurement
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws deliver exceptional performance in industrial fastening applications where reliability and compliance are critical. The coarse thread design combined with Class 2A thread fit ensures rapid installation while minimizing the risk of thread stripping in soft materials or repeated assembly operations. The zinc-plated surface treatment provides essential corrosion protection for equipment exposed to moisture, chemicals, or outdoor conditions. With their fully threaded right-hand configuration and slotted drive style, these screws offer versatile mounting solutions for electronic enclosures, machinery components, and assembly fixtures where space constraints demand the low-profile pan head design. The combination of 60,000 psi tensile strength and Rockwell B60 hardness makes these fasteners ideal for applications requiring repeated maintenance without compromising thread integrity.
Specification Summary & Compliance
These rounded head screws feature precise Class 2A thread fit with UNC coarse threading (4-40 size) and are manufactured to ASME B18.6.3 specifications for dimensional accuracy. The fasteners maintain 1/8" length with standard pan head profile (0.219" diameter) and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet current industrial safety and sustainability requirements.
