S-97345A843 1/2"-13 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing in demanding applications.
- Precise alignment and spacing enabled by the machined shoulder with controlled diameter and length tolerances.
- High-reliability threading with Class 3A UNC coarse threads ensuring secure, vibration-resistant fastening.
- Easy installation and removal via the hex socket drive and knurled head for improved grip with standard tools.
- Long-term durability supported by Rockwell B79 hardness, resisting wear and deformation under stress.
- Regulatory peace of mind with compliance to ASME B18.3, RoHS 3, and REACH for safe, standardized use.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assemblies, such as maintaining exact component alignment and resisting loosening under dynamic loads. The UNC coarse thread and Class 3A fit provide rapid assembly with high clamping force, while the knurled socket head enhances tool engagement in confined spaces. Its corrosion-resistant properties make it suitable for marine, chemical processing, and food-grade equipment, where moisture and aggressive media are concerns. The precisely machined shoulder acts as a pivot or spacer, reducing wear on moving parts in machinery, automation systems, and pivoting mechanisms, ensuring long-term operational reliability and reduced maintenance.
Specification Summary & Compliance
This shoulder screw features a 1/2"-13 UNC thread with Class 3A fit for precise engagement, a shoulder diameter of 3/4" with tolerance of -0.004" to -0.002", and shoulder length of 1" with tolerance of -0.005" to 0.005". It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it meets industry standards for safety and performance.
