S-94361A372 1/2"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
• Black oxide finish on alloy steel offers enhanced corrosion resistance and a durable, low-glare surface for extended service life.
• Knurled socket head with 5/16" hex drive allows for secure tool grip and easy installation, even in tight spaces.
• Accurate 5/8" shoulder diameter and 1" length with tight tolerances ensures precise alignment and smooth rotation in assemblies.
• UNF fine threads (1/2"-20) deliver higher clamping force and better load distribution compared to coarse threads.
• Compliance with RoHS and REACH regulations guarantees environmental safety and suitability for global industrial markets.

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 Class 3A UNF fine threads and robust 140,000 psi tensile strength prevent stripping and withstand high cyclic loads, making it ideal for pivoting joints, rotating shafts, and alignment fixtures. The black oxide finish not only resists rust but also reduces friction, while the knurled socket head ensures tool retention during assembly. By combining high hardness (Rockwell C32) with exact shoulder dimensions, this screw minimizes wear and maintains positional accuracy in demanding industrial applications, enhancing overall equipment reliability.

Specification Summary & Compliance

This shoulder screw adheres to UNF thread standards with a Class 3A fit for precise thread engagement. Dimensions include a shoulder diameter of 5/8" (tolerance: -0.004" to -0.002") and shoulder length of 1" (tolerance: -0.005" to 0.005"), ensuring consistent performance. It is manufactured from alloy steel and meets RoHS 3 (2015/863/EU) with exemption 6(a) and REACH (EC 1907/2006) compliance, supporting use in regulated environments.