S-91259A804 1/2"-13 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 Tensile Strength: Withstands up to 140,000 psi for reliable performance in high-stress industrial applications.
- Precision Shoulder Fit: Maintains tight tolerances (-0.004" to -0.002" diameter, -0.005" to 0.005" length) for accurate alignment and reduced vibration.
- Superior Corrosion Resistance: Black oxide finish provides enhanced durability in harsh environments.
- High Shear Strength: Minimum 84,000 psi shear strength ensures secure fastening under lateral loads.
- Easy Installation & Removal: Knurled socket head with 5/16" hex drive allows for quick, slip-resistant tool engagement.
- Industry Compliance: Meets ASME B18.3 and ASTM A574 standards, plus RoHS 3 and REACH regulations for safe, global use.
- Coarse Thread Advantage: 1/2"-13 UNC Class 3A threads enable faster assembly and better resistance to loosening.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 2-1/2" shoulder length with controlled tolerances acts as a precise pivot or axle, minimizing bushing wear and maintaining component positioning under dynamic loads. The black oxide finish not only resists corrosion but also reduces galling during repeated adjustments. With its 140,000 psi tensile strength and Class 3A thread fit, it ensures vibration-resistant connections in assemblies requiring high clamping force, such as robotic arms, conveyor systems, and fixture plates, reducing maintenance downtime and improving operational reliability.
Specification Summary & Compliance
This shoulder screw features a 1/2"-13 UNC coarse thread with Class 3A fit for precise engagement, and a shoulder diameter tolerance of -0.004" to -0.002" with length tolerance of -0.005" to 0.005". Manufactured from alloy steel hardened to Rockwell C32, it complies with ASME B18.3 and ASTM A574 specifications. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety standards for industrial use.
