S-94361A367 1/2"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with alloy steel construction and 140,000 psi tensile strength for reliable performance in demanding applications.
• Superior corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments.
• Precise alignment and secure positioning ensured by the standard shoulder fit and Class 3A thread fit for minimal play and vibration resistance.
• Easy and secure installation with the knurled socket head and 5/16" hex drive, preventing tool slippage during tightening.
• High wear resistance and hardness from Rockwell C32 rating, maintaining dimensional stability under load.
• Fine thread design (1/2"-20 UNF) offers improved adjustment precision and better resistance to loosening compared to coarse threads.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The black oxide finish not only enhances corrosion resistance but also reduces friction, making it ideal for applications exposed to moisture or chemicals. With a Class 3A thread fit and UNF fine threads, it provides superior clamping force and vibration resistance, preventing failures in dynamic assemblies. The knurled socket head ensures reliable torque transmission, reducing installation errors in high-stress environments like robotics, aerospace components, and industrial molds. Its robust shoulder diameter and length with tight tolerances facilitate exact alignment in pivoting mechanisms, bushings, and rotating assemblies, delivering long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This shoulder screw features a 1/2"-20 UNF fine thread with Class 3A fit for high precision, ensuring minimal clearance and secure fastening. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", adhering to strict manufacturing standards. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and is REACH (EC 1907/2006) compliant, meeting environmental and safety requirements for industrial use.