S-91259A720 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
- Enhanced Durability & Corrosion Resistance: Black oxide finish protects against rust and wear in demanding industrial environments.
- Superior Tensile & Shear Strength: Alloy steel construction with 140,000 psi tensile and 84,000 psi shear strength ensures reliable performance under high stress.
- Precision Fit & Stability: Class 3A thread fit and 2" shoulder length provide exact alignment and reduced vibration in assemblies.
- Easy Installation & Removal: 1/4" hex socket drive and knurled head allow for secure, non-slip tool engagement.
- High Hardness for Longevity: Rockwell C32 hardness offers excellent resistance to deformation and extends service life.
- Broad Industrial Compliance: Meets ASME B18.3 standards and is RoHS 3 & REACH compliant for safe, regulated use.
- Optimized Thread Design: 3/8"-16 UNC coarse thread ensures quick assembly and strong holding power.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automotive systems, and precision equipment. The 2" shoulder length acts as a precise pivot or spacer, minimizing misalignment and wear on moving parts. The black oxide finish enhances corrosion resistance, which is vital in humid or chemically aggressive environments. With a Class 3A thread fit and UNC coarse thread, it provides rapid assembly and high clamping force, reducing installation time and improving operational reliability. The knurled head and hex socket drive facilitate easy handling even in tight spaces, making it ideal for applications requiring repeated adjustments or maintenance.
Specification Summary & Compliance
This shoulder screw features a 3/8"-16 UNC thread with Class 3A fit for precise threading and a shoulder diameter tolerance of -0.004" to -0.002" for accurate alignment. It is manufactured in accordance with ASME B18.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for industrial use.
