S-91273A666 1/2"-13 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads and stress.
• Precise shoulder alignment with a 1 1/2" shoulder length and tight tolerances for accurate component positioning in assemblies.
• Easy installation and removal using a standard 1/4" hex socket drive and knurled head for improved grip and torque application.
• Durable thread integrity with UNC coarse threads and Class 2A fit, providing secure fastening and resistance to vibration loosening.
• Consistent hardness at Rockwell B55 maintains dimensional stability and wear resistance over repeated use.
• Compliance with environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This 1/2"-13 UNC shoulder screw is engineered to address critical challenges in industrial fastening applications, such as machinery assembly, automotive components, and precision equipment. The 18-8 stainless steel material combined with a black oxide finish offers superior resistance to corrosion and oxidation, extending service life in demanding conditions. The knurled head and hex socket drive facilitate quick, secure installation without slippage, while the coarse thread design ensures strong holding power in materials prone to stripping. With a 1 1/2" shoulder length, it provides exact spacing and alignment for rotating parts, reducing wear and maintenance needs. Ideal for high-stress environments, this shoulder screw delivers reliable performance, minimizing downtime and enhancing operational efficiency.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for precise tolerance and easy assembly. Key dimensions include a 1/2"-13 thread size, 1 1/2" shoulder length (tolerance: -0.005" to 0.005"), and 1/2" shoulder diameter (tolerance: -0.004" to -0.002"). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.