S-94328A968 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with 140,000 psi tensile strength and Rockwell C30 hardness, ideal for high-stress industrial environments.
• Superior corrosion resistance from the black oxide finish, extending service life in harsh or outdoor applications.
• Precise thread engagement and reliable fastening due to the Class 3A thread fit and 5/16"-18 UNC coarse threads, reducing the risk of cross-threading.
• Secure, non-slip installation enabled by the knurled, low-profile socket head and 3/16" hex drive, allowing for high torque application in confined spaces.
• Accurate component alignment and spacing provided by the precisely machined shoulder with standard fit, ensuring consistent assembly performance.
• Compliance with stringent environmental regulations, being RoHS 3 and REACH compliant, for use in regulated industries and global markets.
• Versatile for demanding applications thanks to the alloy steel construction and coarse threading, offering excellent performance in machinery, automotive, and heavy equipment.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision assembly and heavy-duty operations. The black oxide finish provides a robust barrier against rust and wear, making it suitable for environments exposed to moisture, chemicals, or frequent use. With a Class 3A thread fit and UNC coarse threads, it ensures quick, secure fastening with minimal risk of stripping, which is vital in high-vibration settings like automotive manufacturing or industrial machinery. The low-profile socket head with knurling allows for efficient torque application even in tight spaces, reducing installation time and improving safety. These features make it an ideal choice for applications requiring reliable alignment, such as in pivoting mechanisms, rotating shafts, and precision tooling, where consistent performance under 140,000 psi tensile strength is non-negotiable.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC thread specifications. The shoulder features a diameter of 3/8" with a tolerance of -0.004" to -0.002" and a length of 5/8" with a tolerance of -0.005" to 0.005", ensuring accurate fit in assemblies. Manufactured from high-strength alloy steel, it meets industry requirements for durability and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and regulated industrial applications.