S-91781A561 1/4"-28 x 1" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws
Stainless 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
- Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and extended service life
- High tensile strength of 80,000 psi ensures reliable, vibration-resistant fastening in demanding applications
- Precision Class 2A thread fit with UNF fine threads provides smooth assembly and secure, tight connections
- 82° countersink angle and standard flat head profile enable flush mounting for a clean, aerodynamic, and safe finish
- Fully threaded design offers maximum grip and load distribution along the entire 1" length
- Rockwell B80 hardness delivers excellent durability and resistance to wear and deformation
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees consistent quality, safety, and environmental standards
Professional Applications & Engineering Value
This 1/4"-28 UNF flat head slotted screw is engineered to address critical industrial challenges, such as corrosion, vibration loosening, and space constraints. Constructed from 18-8 Stainless Steel with a passivated finish, it resists rust and chemical exposure, making it ideal for marine, chemical processing, and outdoor equipment. The fine thread spacing and Class 2A fit ensure precise engagement in materials like metals and plastics, reducing the risk of stripping. The flat head with 82° countersink allows for seamless integration in assemblies requiring a smooth surface, such as aerospace panels or machinery housings, enhancing both performance and aesthetics while meeting rigorous ASME B18.6.3 standards.
Specification Summary & Compliance
This screw features a 1/4"-28 UNF thread with Class 2A fit for precise dimensional accuracy and fine thread spacing. It is manufactured in accordance with ASME B18.6.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
