S-91259A580 1/4"-20 ASME B18.3, ASTM A574 Shoulder Screws
Shoulder 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 black oxide finish for extended service life in demanding environments
- Exceptional mechanical strength with 140,000 psi tensile strength and Rockwell C32 hardness for heavy-duty applications
- Precision thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
- Optimized shoulder design with 5/16" diameter providing accurate component alignment and rotational stability
- Easy installation and removal with 5/32" hex socket drive and knurled head for secure tool grip
- Reliable performance in high-stress applications with minimum 84,000 psi shear strength
- Industry-standard compatibility with UNC coarse threads and right-hand direction for universal application
Professional Applications & Engineering Value
These alloy steel shoulder screws with black oxide finish deliver critical performance in precision machinery, automation systems, and industrial equipment where component alignment and rotational stability are paramount. The 1/4-20 UNC coarse threads with Class 3A fit ensure secure fastening while the precisely machined shoulder (5/16" diameter, 5/8" length) provides accurate bearing surfaces for gears, pulleys, and rotating assemblies. The socket head design with hex drive allows for compact installation in confined spaces, while the knurled texture enhances grip during manual adjustments. Engineered to withstand high tensile and shear loads, these screws prevent misalignment issues that can lead to premature wear in precision mechanisms.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit and shoulder diameter tolerance of -0.004" to -0.002" for precision applications. Complies with ASME B18.3 specifications and ASTM A574 material standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features UNC coarse thread profile with 7/16" thread length and right-hand thread direction for standardized industrial use.
