S-94361A324 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
• Black oxide finish offers enhanced corrosion resistance, extending service life in harsh operating conditions.
• Knurled socket head with 5/32" hex drive allows for secure tool grip and easy installation, even in confined spaces.
• Alloy steel construction with Rockwell C32 hardness delivers excellent durability and wear resistance for long-term use.
• Fine UNF thread design ensures accurate positioning and clamping force in precision assemblies.
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and suitability for global markets.

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 instruments. The Class 3A thread fit and fine UNF threading provide exceptional accuracy and stability, preventing misalignment in assemblies subject to vibration or thermal cycling. The black oxide finish not only resists corrosion but also reduces galling during installation, making it ideal for applications in humid or chemically aggressive environments. With a shoulder diameter of 5/16" and tight tolerances, it ensures precise component positioning, reducing wear and maintenance needs in high-cycle operations. These features make it a reliable choice for robotics, conveyor systems, and fixture designs where repeatability and strength are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNF thread standards with a Class 3A fit for high precision. Dimensions include a thread size of 1/4"-28, shoulder diameter of 5/16" with tolerance of -0.004" to -0.002", and shoulder length of 5/16" with tolerance of -0.005" to 0.005". It is manufactured from alloy steel with a hardness of Rockwell C32 and tensile strength of 140,000 psi. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(a) and REACH (EC 1907/2006) compliant, ensuring it meets stringent environmental and safety regulations.