S-91263A169 1/4"-20 x 3 1/2" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional corrosion resistance with zinc-plated alloy steel construction for long-lasting performance in harsh industrial environments
- Superior load-bearing capability with 120,000 psi tensile strength and Rockwell C32 hardness for demanding applications
- Precise thread engagement with Class 3A fit UNC coarse threading ensuring reliable fastening and vibration resistance
- Optimized flush mounting with standard 82° countersink angle for seamless surface integration and reduced snagging
- Enhanced installation efficiency through hex drive design allowing high-torque application with standard tools
- Reliable partial threading providing unthreaded shank section for improved shear strength and alignment
- Full regulatory compliance meeting ASME B18.3 standards and environmental regulations for global industrial use
Professional Applications & Engineering Value
These zinc-plated alloy steel flat head screws deliver critical engineering solutions for industrial assembly challenges. The UNC coarse threading with Class 3A fit provides superior resistance to vibration loosening in machinery and equipment, while the 82° countersink angle ensures flush mounting in precision applications. The partial threading design enhances structural integrity by maintaining full diameter in the unthreaded portion, making these flat head hex screws ideal for heavy-duty fastening in construction, manufacturing, and automotive applications where 120,000 psi tensile strength is required to withstand extreme mechanical stresses.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit precision and UNC coarse threading standards. The 1/4"-20 thread size with 3-1/2" length maintains strict dimensional accuracy. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets while meeting all specified mechanical and dimensional requirements.
