S-91259A711 3/8"-16 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
- Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications
- Superior corrosion resistance through black oxide finish, extending service life in harsh industrial environments
- Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Enhanced grip and torque application featuring knurled head texture and 1/4" hex drive for secure tool engagement
- Accurate shoulder positioning with controlled diameter and length tolerances for precise component alignment
- High material integrity from alloy steel construction with Rockwell C32 hardness for lasting durability
- Broad regulatory compliance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
Engineered for precision industrial applications, these alloy steel shoulder screws provide critical alignment and rotational control in machinery assemblies. The 3/8"-16 UNC coarse threads with Class 3A fit ensure rapid installation and secure fastening in high-vibration environments, while the black oxide finish delivers reliable corrosion protection for extended service life. The knurled socket head with 1/4" hex drive allows for high-torque installation without slippage, making these shoulder screws ideal for precision equipment, rotating assemblies, and mechanical linkages where dimensional accuracy and strength are paramount. The controlled shoulder dimensions provide consistent bearing surfaces for moving components, eliminating the need for additional spacers or bushings.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and controlled shoulder diameter tolerance (-0.004" to -0.002") and length tolerance (-0.005" to 0.005"). Complies with ASME B18.3 specifications under ASTM A574 material standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for industrial use.
