S-93791A416 1/4"-20 x 3/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws
Stainless Steel 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 with 18-8 stainless steel construction and black-oxide passivated finish, ideal for harsh industrial environments.
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance in demanding applications.
- Precise Class 3A thread fit ensures secure, vibration-resistant fastening with minimal risk of loosening.
- Fully threaded design provides maximum grip and load distribution along the entire length.
- Standard 82° countersink angle allows for a flush, clean finish when installed in countersunk holes.
- Hex drive (5/32") enables high-torque installation with common tools, reducing assembly time.
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head screws are engineered to address critical challenges in industrial assembly, such as vibration-induced loosening and corrosion in demanding environments. The 18-8 stainless steel material combined with a black-oxide, passivated finish provides excellent resistance to rust and chemical exposure, making them suitable for outdoor equipment, machinery, and automotive applications. The coarse thread spacing and Class 3A thread fit ensure quick installation and a secure hold, reducing maintenance needs. With a fully threaded design and hex drive, they offer efficient fastening in tight spaces, enhancing productivity and reliability in heavy-duty fastening scenarios.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 3A fit for precise dimensional accuracy, and an 82° countersink angle per standard flat head profiles. It complies with ASME B18.3 specifications for consistency and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance compliance.
