S-90276A564 1/4"-28 x 2" ASME B18.6.3 Steel Round Head Slotted Screws
Steel Round Head Slotted 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 zinc-plated steel construction, extending service life in harsh industrial environments
- Excellent holding power from UNF fine threads and Class 2A fit, ensuring secure fastening in precision applications
- High tensile strength rating of 60,000 psi provides reliable performance under heavy loads and vibration
- Optimized drive engagement with standard slotted head design for straightforward installation and removal
- Full threading along 2" length offers maximum grip depth and adjustment flexibility in assembled components
- Consistent hardness (Rockwell B69) maintains structural integrity and prevents stripping during torque application
- Rounded head profile reduces surface marring and provides a finished appearance in visible applications
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws deliver critical reliability in industrial assembly where vibration resistance and corrosion protection are paramount. The UNF fine thread configuration maintains tighter clamping force in machinery, automotive components, and electrical enclosures compared to coarse threads. With full threading along the entire 2" length, engineers gain maximum engagement depth for securing thick materials or stacked components. The slotted drive accommodates standard tools for maintenance accessibility, while the rounded head design minimizes snagging hazards in moving equipment. This combination addresses common failure points in heavy-duty applications through superior tensile strength and controlled thread fit.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerances ensuring consistent mating with UNF nuts and threaded holes. The 1/4"-28 UNF fine thread maintains precise pitch control with 0.25" major diameter. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety standards. Mechanical properties include 60,000 psi tensile strength and Rockwell B69 hardness for dependable performance in regulated industrial applications.
