S-91259A497 8-32 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Tensile and Shear Strength: Withstands up to 140,000 psi tensile and 84,000 psi shear loads, providing reliable performance in high-stress industrial environments.
• Precision Class 3A Thread Fit: Ensures tight, secure fastening with minimal backlash, ideal for applications requiring exact alignment and vibration resistance.
• Durable Alloy Steel Construction: Offers superior hardness (Rockwell C32) and long-term wear resistance, reducing the need for frequent replacements.
• Corrosion-Resistant Black Oxide Finish: Enhances surface protection against rust and oxidation, extending service life in harsh conditions.
• Knurled Socket Head with Hex Drive: Allows for easy installation and removal using standard 3/32" hex tools, improving assembly efficiency.
• Standardized Shoulder Design: Features precise shoulder diameter and length tolerances for consistent positioning and load distribution in machinery.
• Compliance with Major Standards: Meets ASME B18.3, RoHS 3, and REACH regulations, ensuring safety, environmental responsibility, and global acceptance.

Professional Applications & Engineering Value

This 8-32 UNC shoulder screw is engineered to address critical challenges in precision assembly and heavy-duty applications. Made from alloy steel with a black oxide finish, it combats corrosion and wear in environments like automotive, aerospace, and industrial machinery. The Class 3A thread fit and coarse threading provide secure, vibration-resistant connections, reducing loosening in dynamic systems. The socket head design with a knurled texture ensures easy handling and torque application, speeding up maintenance and production. Ideal for pivots, axles, and guides, this screw enhances equipment reliability and minimizes downtime, making it a cost-effective solution for B2B procurement.

Specification Summary & Compliance

This shoulder screw adheres to strict dimensional tolerances, including a Class 3A thread fit for precision and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.