S-94383A270 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
- Enhanced Durability: Alloy steel construction with Rockwell C32 hardness ensures long-lasting performance in high-stress environments.
- Superior Thread Precision: Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies.
- Corrosion Resistance: Black oxide finish protects against rust and wear, extending service life in harsh conditions.
- High Load Capacity: 140,000 psi tensile strength and 84,000 psi shear strength support demanding mechanical applications.
- Secure Grip & Easy Installation: Knurled head and 5/32" hex drive allow for firm handling and efficient torque application.
- Accurate Shoulder Alignment: Tight shoulder diameter and length tolerances ensure precise component positioning.
- Broad Compliance: Meets ASME B18.3, ASTM A574, RoHS 3, and REACH standards for reliable, industry-approved use.
Professional Applications & Engineering Value
This alloy steel shoulder screw with 1/4"-20 UNC coarse threads and Class 3A fit is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The black oxide finish enhances corrosion resistance, making it suitable for environments exposed to moisture or chemicals. Its high tensile and shear strength ensures reliable performance in dynamic applications, such as rotating shafts and pivoting mechanisms, where shoulder diameter and length tolerances maintain exact component spacing. The knurled head and hex drive facilitate quick, secure installation, reducing assembly time while meeting strict ASME B18.3 and material specifications for consistent quality.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threads for precise engagement, and shoulder dimensions including a diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" to ensure accurate alignment. It complies with ASME B18.3 and ASTM A574 standards for material and manufacturing consistency, and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, supporting environmental and safety regulations in global supply chains.
