S-91273A239 1/2"-13 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and stress.
• Precision Class 2A thread fit guarantees consistent, secure fastening with minimal play.
• Knurled socket head design provides superior grip and reduces slippage during installation.
• Long 4 1/2" shoulder length offers stable alignment and spacing in assemblies.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance.
• Coarse UNC thread allows for quick assembly and disassembly in high-vibration applications.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment and component wear. The precision shoulder diameter and Class 2A UNC thread provide exact tolerances, reducing the risk of loosening under dynamic loads. Its high tensile and shear strength makes it suitable for heavy-duty applications like machinery mounts, pivots, and rotating assemblies, where durability and reliability are paramount. The knurled socket head enhances tool engagement, speeding up installation in tight spaces while maintaining a secure fit. Ideal for use in automotive, manufacturing, and robotics, this screw delivers long-term performance with minimal maintenance.

Specification Summary & Compliance

This shoulder screw adheres to Class 2A thread fit for precise dimensional accuracy, with a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring compliance with environmental and safety regulations. Manufactured from 18-8 stainless steel with a Rockwell B55 hardness, it meets industry requirements for strength and corrosion resistance in demanding applications.