S-94361A123 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in demanding, heavy-duty applications without failure.
• Superior corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments.
• Precision Class 3A thread fit guarantees secure, vibration-resistant connections with minimal risk of loosening.
• High hardness (Rockwell C32) offers excellent wear resistance, maintaining dimensional stability under load.
• Knurled socket head with 5/32" hex drive allows for easy installation and removal, even in tight spaces.
• Tight shoulder tolerances ensure accurate alignment and smooth rotation in assemblies, reducing wear on mating parts.
• Compliance with RoHS 3 and REACH ensures 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 and industrial equipment. The 1/4"-28 UNF fine thread with Class 3A fit provides superior holding power and vibration resistance, essential for dynamic loads in automotive, aerospace, and manufacturing assemblies. The black oxide finish not only enhances corrosion resistance but also reduces friction, facilitating smoother operation in rotating applications. With a robust shoulder diameter of 5/16" and controlled tolerances, it ensures exact positioning and alignment, minimizing misalignment-induced wear. Ideal for use in jigs, fixtures, and pivoting mechanisms, this screw delivers reliable performance where precision and durability are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNF fine thread standards with a Class 3A thread fit for high precision. Key dimensional tolerances include a shoulder diameter of -0.004" to -0.002" and shoulder length of -0.005" to 0.005", ensuring consistent performance. Manufactured from alloy steel and treated to Rockwell C32 hardness, it meets rigorous mechanical demands. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its suitability for environmentally conscious industrial applications.