S-91259A154 4-40 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
- Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by the black oxide finish, extending service life in demanding industrial environments
- Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Optimized hardness profile at Rockwell C32 for excellent wear resistance while maintaining necessary ductility
- Consistent dimensional accuracy with controlled shoulder diameter and length tolerances for precise component alignment
- Easy installation and maintenance through standard 5/64" hex drive socket head design
- Regulatory compliance assurance meeting ASTM A574, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish delivers critical performance in precision machinery, automation systems, and heavy-duty equipment where alignment accuracy and high-strength fastening are paramount. The 4-40 UNC coarse threads with Class 3A fit provide superior vibration resistance in dynamic applications, while the precisely machined shoulder ensures proper component spacing and rotational stability. Engineered to withstand extreme mechanical stresses, these socket head shoulder screws maintain dimensional integrity under loads up to 140,000 psi tensile strength, making them ideal for pivoting mechanisms, bearing retention, and precision assembly applications where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit and controlled shoulder diameter tolerance (-0.004" to -0.002") and shoulder length tolerance (-0.005" to 0.005"). Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features UNC coarse thread profile with 5/32" thread length and standard shoulder fit for consistent performance across industrial applications.
