S-94361A125 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish provides superior protection against rust and wear in harsh industrial environments.
• High Tensile Strength for Demanding Applications: 140,000 psi tensile strength and Rockwell C32 hardness ensure reliable performance under heavy loads and stress.
• Precision Thread Fit for Secure Fastening: Class 3A thread fit guarantees tight tolerances and vibration resistance, reducing the risk of loosening.
• Superior Grip & Easy Installation: Knurled socket head with 5/32" hex drive allows for secure tool engagement and efficient assembly.
• Accurate Shoulder Dimensions for Alignment: 5/16" shoulder diameter and 3/4" shoulder length with tight tolerances provide precise component positioning.
• Fine Thread Spacing for Enhanced Holding Power: UNF fine thread (1/4"-28) offers improved clamping force and resistance to vibration in critical assemblies.
• Compliance with Environmental & Safety Standards: RoHS 3 and REACH compliant, ensuring safe use in regulated industries and global markets.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address common industrial challenges such as misalignment, vibration-induced failure, and corrosion. The black oxide finish enhances durability in humid or abrasive conditions, while the Class 3A thread fit and UNF fine thread design provide exceptional resistance to loosening under dynamic loads. Ideal for precision machinery, automotive assemblies, and robotic systems, the knurled socket head ensures secure tool engagement during installation, reducing slippage and improving workflow efficiency. The accurately machined shoulder diameter and length facilitate proper alignment of moving parts, minimizing wear and extending service life in high-stress applications.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with precise dimensions: 1/4"-28 UNF fine thread, 5/16" shoulder diameter (tolerance: -0.004" to -0.002"), and 3/4" shoulder length (tolerance: -0.005" to 0.005"). Manufactured from high-strength alloy steel with a black oxide finish, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.