S-90275A112 4-40 x 5/8" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted Flat Head 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
- Enhanced corrosion resistance with zinc plating for extended service life in demanding industrial environments
- Superior holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable, vibration-resistant fastening
- Precision thread engagement with Class 2A fit and UNC coarse threads for quick installation and reduced cross-threading risks
- Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface finishing
- Full-threaded design providing maximum grip along the entire 5/8" length for superior load distribution
- Industry-standard compliance with ASME B18.6.3 specifications ensuring interchangeability and reliability
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices
Professional Applications & Engineering Value
These 4-40 UNC flat head slotted screws deliver exceptional engineering value for industrial applications requiring precise flush mounting and reliable fastening performance. The zinc-plated steel construction provides essential corrosion protection in manufacturing environments, while the Class 2A thread fit ensures consistent engagement without binding. The fully threaded design maximizes surface contact for superior vibration resistance in machinery, electronics, and equipment assembly. With 60,000 psi tensile strength and standardized 82° countersink angle, these screws solve critical challenges in applications where surface integrity and reliable fastening under stress are paramount. The slotted drive offers compatibility with standard tools, making them ideal for maintenance and production lines requiring versatile fastening solutions.
Specification Summary & Compliance
These flat head screws maintain precise Class 2A thread fit tolerances with UNC coarse thread spacing and right-hand threading. Manufactured to exact ASME B18.6.3 specifications, they ensure dimensional consistency and mechanical reliability. The products fully comply with RoHS 3 (2015/863/EU) restrictions on hazardous substances and meet REACH (EC 1907/2006) requirements for chemical safety, making them suitable for global industrial applications requiring environmental compliance.
