S-92949A556 1/4"-20 x 3 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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
- Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Superior load-bearing capacity with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Precise thread engagement through Class 3A fit and UNC coarse spacing, ensuring reliable fastening in heavy-duty assemblies
- Easy installation and removal with 5/32" hex drive and rounded button head design, reducing assembly time and tool wear
- Full-length threading provides consistent grip along the entire 3 1/2" length, maximizing holding power in thick materials
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety
- Durable surface protection through passivation, enhancing longevity in corrosive or high-moisture conditions
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw delivers critical performance in industrial settings where corrosion resistance and mechanical strength are paramount. The passivated finish significantly extends service life by preventing oxidation in chemical processing, marine, or outdoor equipment. With its UNC coarse thread and Class 3A fit, it ensures rapid assembly and vibration resistance in heavy machinery, structural frameworks, and transportation systems. The hex drive and button head design facilitate access in confined spaces, while the fully threaded construction distributes clamping force evenly across joints. Ideal for OEM manufacturing and MRO operations, this screw addresses common failure points like thread stripping and environmental degradation.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit and UNC coarse spacing (1/4"-20). Dimensions include 0.437" head diameter, 0.132" head height, and 3 1/2" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.
