S-94361A399 3/4"-16 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced load distribution with a precise 1" shoulder diameter and tight tolerances (-0.004" to -0.002") for reliable bearing surfaces in high-stress assemblies.
• Superior thread integrity through Class 3A UNF fine threads, ensuring secure fastening and vibration resistance in demanding applications.
• Exceptional durability from alloy steel construction with Rockwell C32 hardness and 140,000 psi tensile strength, offering long-term performance under heavy loads.
• Effective corrosion protection with a black oxide finish, extending service life in harsh industrial environments.
• Secure and easy installation thanks to the knurled socket head and 1/2" hex drive, preventing tool slippage during torque application.
• Regulatory compliance assurance with RoHS 3 and REACH standards, meeting global environmental and safety requirements for industrial use.
• Accurate alignment and spacing provided by the 1-1/2" shoulder length with controlled tolerances, reducing assembly errors and improving machinery efficiency.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in industrial applications where precision alignment and high strength are paramount. The 3/4"-16 UNF fine threads with Class 3A fit deliver secure, vibration-resistant connections in machinery, automotive, and heavy equipment assemblies, minimizing loosening under dynamic loads. The 1" shoulder diameter with tight tolerances acts as a reliable pivot or bearing surface, reducing wear and ensuring accurate component positioning. Combined with the black oxide finish, it resists corrosion in exposed or humid conditions, while the knurled socket head facilitates quick, tool-safe installation. Ideal for precision shoulder screw uses in jigs, fixtures, and rotating mechanisms, it enhances operational reliability and reduces maintenance downtime.

Specification Summary & Compliance

This shoulder screw maintains high dimensional accuracy with a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Threads adhere to UNF fine thread standards with a Class 3A fit for precise engagement. Manufactured from alloy steel hardened to Rockwell C32 and finished with black oxide, it meets RoHS 3 (2015/863/EU) compliance under exemption 6(a) and REACH (EC 1907/2006) standards, ensuring environmental and safety adherence for industrial components.