S-91781A551 1/4"-20 x 2 1/4" 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 construction and passivated finish, ideal for harsh industrial environments.
- High tensile strength of 80,000 psi and Rockwell B80 hardness ensure reliable, long-lasting fastening under stress.
- Precise Class 2A thread fit and UNC coarse threading for easier, faster assembly and reduced cross-threading risk.
- 82° countersink angle and standard flat head profile allow for a flush, secure fit in countersunk holes.
- Partially threaded design provides enhanced grip and clamping force on specific material sections.
- Compliance with ASME B18.6.3 ensures dimensional accuracy and interchangeability for professional applications.
- Environmentally compliant with RoHS 3 and REACH standards, supporting sustainable and safe manufacturing practices.
Professional Applications & Engineering Value
This 1/4-20 UNC flat head screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The 18-8 stainless steel material, combined with a passivated finish, offers exceptional resistance to rust and chemical exposure, making it suitable for outdoor machinery, marine equipment, and food processing applications. The coarse thread spacing and partially threaded shank ensure quick installation and strong holding power in soft materials or pre-tapped holes. Its slotted drive allows for straightforward manual assembly, while the 82° countersink angle ensures a seamless, low-profile finish that minimizes protrusion and improves safety in dynamic environments.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances and UNC thread standards for consistent performance. It meets ASME B18.6.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
