S-90585A133 6-40 x 1/2" ASME B18.3, ASTM F879 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 in harsh environments due to 316 stainless steel construction and passivated finish
- Exceptional thread engagement and vibration resistance from the precision 6-40 UNF fine thread with Class 3A fit
- Reliable high-strength performance with a 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Flush, secure installation enabled by the standard 82° flat head profile and hex drive for precise torque application
- Guaranteed dimensional accuracy and interchangeability through compliance with the ASME B18.3 standard
- Safe for regulated industries with full compliance to RoHS 3 and REACH environmental directives
- Maximum grip and holding power from the fully threaded design along the entire 1/2" length
Professional Applications & Engineering Value
This 316 stainless steel flat head screw is engineered to solve critical challenges in corrosive and high-stress environments. The UNF fine threading and Class 3A fit provide superior resistance to loosening under vibration, a common failure point in machinery and equipment. The combination of passivated finish and marine-grade 316 material offers exceptional protection against chemicals, saltwater, and industrial atmospheres, significantly extending service life in applications like marine hardware, chemical processing equipment, and food machinery. The 82° countersink angle ensures a flush fit, eliminating protrusions for safer operation and streamlined assemblies. Manufactured to ASME B18.3, this fastener delivers the precision and reliability required for critical industrial fastening where failure is not an option.
Specification Summary & Compliance
This flat head screw features a 6-40 UNF thread with Class 3A fit for high precision, a head diameter of 0.307", and a length of 1/2". It is fully threaded and manufactured in accordance with ASME B18.3 specifications. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substances.
