S-94361A374 1/2"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength and Durability: With a tensile strength of 140,000 psi and Rockwell C32 hardness, this shoulder screw withstands high-stress applications, reducing the risk of failure and extending service life.
• Superior Corrosion Resistance: The black oxide finish provides a protective layer that minimizes rust and wear, ideal for harsh industrial environments and enhancing longevity.
• Precision Thread Fit for Secure Fastening: Class 3A UNF fine threads ensure tight, reliable connections with minimal backlash, improving assembly accuracy and vibration resistance.
• Enhanced Grip and Easy Installation: The knurled head and 5/16" hex drive allow for secure tool engagement and straightforward tightening, speeding up maintenance and reducing installation errors.
• Accurate Shoulder Dimensions for Stable Alignment: Features a 5/8" shoulder diameter and 1 1/4" shoulder length with tight tolerances, providing consistent spacing and support in machinery and equipment.
• Compliance with Environmental Standards: Meets RoHS 3 and REACH regulations, ensuring safe use in regulated industries and supporting global supply chain requirements.
• Versatile Material for Demanding Applications: Made from alloy steel, it offers excellent strength-to-weight ratio, suitable for heavy-duty uses in automotive, aerospace, and industrial assembly.

Professional Applications & Engineering Value

This alloy steel shoulder screw with a black oxide finish is engineered to address common industrial challenges, such as misalignment and corrosion in high-load environments. The 1/2"-20 UNF Class 3A thread provides a fine, precise fit that resists loosening under vibration, making it ideal for machinery, equipment assembly, and precision instruments. The knurled head and hex drive facilitate quick installation, while the robust shoulder design ensures stable component positioning, reducing wear and maintenance downtime. By combining high tensile strength and corrosion resistance, it delivers reliable performance in demanding sectors like automotive manufacturing and aerospace, where durability and compliance with standards are critical.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNF fine thread standards, ensuring high precision with a thread size of 1/2"-20. Dimensions include a shoulder diameter of 5/8" (tolerance: -0.004" to -0.002") and shoulder length of 1 1/4" (tolerance: -0.005" to 0.005"), supporting accurate assembly. It is manufactured to meet RoHS 3 (2015/863/EU) with exemption 6(a) for lead in steel and is REACH (EC 1907/2006) compliant, confirming its suitability for regulated industrial applications.