S-97595A557 2-56 x 1/4" ASME B18.3 Brass Hex Drive Flat Head Screws
Brass Hex Drive 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
- Superior corrosion resistance due to brass construction, ensuring long-term reliability in harsh environments
- Precise Class 3A thread fit delivers secure, vibration-resistant connections for critical assemblies
- High 50,000 psi tensile strength provides exceptional load-bearing capacity in demanding applications
- Rockwell B55 hardness offers excellent wear resistance and durability under repeated use
- 0.050" hex drive design enables easy installation with standard tools while preventing cam-out
- 82° countersink angle allows for flush mounting in precision-machined components
- Full threading ensures maximum grip length and uniform stress distribution
Professional Applications & Engineering Value
This 2-56 UNC brass flat head screw addresses critical engineering challenges in precision manufacturing and electronics assembly. The coarse thread spacing provides rapid installation while maintaining holding power, particularly valuable in high-volume production environments. The brass material offers inherent corrosion resistance without additional plating, making it ideal for electrical components, marine equipment, and chemical processing applications where galvanic corrosion is a concern. The Class 3A thread fit ensures consistent engagement in tapped holes, eliminating play and reducing vibration-induced loosening in machinery and instrumentation. The flat head profile with 82° countersink creates seamless surface finishes in precision-machined parts, while the hex drive provides superior torque transmission compared to slotted alternatives.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 standards with Class 3A thread tolerances for precision fit. Features UNC coarse threads with 0.086" thread diameter and 1/4" length in inch system measurements. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global markets. The 82° countersink angle meets industry standard specifications for flush mounting applications.
