S-93996A114 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Permanent nylon patch thread locker prevents loosening under dynamic loads, maintaining assembly integrity in temperatures from -70° to 250°F.
• Corrosion-resistant durability: 18-8 stainless steel construction provides excellent resistance to rust and oxidation in harsh industrial environments.
• Precision alignment: Class 2A thread fit and precise shoulder diameter tolerance (-0.001" to 0") ensure accurate component positioning and smooth rotational movement.
• High-strength performance: 70,000 psi tensile strength and Rockwell B55 hardness withstand heavy mechanical stresses without deformation.
• Secure drive engagement: Combination socket/slotted drive head offers multiple tooling options for reliable installation and removal.
• Standardized compatibility: 4-40 UNC coarse threads provide broad interchangeability with existing industrial equipment and components.
• Environmental compliance: Meets RoHS 3 and REACH regulations for safe use in regulated industries and global markets.

Professional Applications & Engineering Value

This precision shoulder screw delivers critical engineering value in applications requiring exact component spacing and secure rotational pivoting. The 1/8" shoulder diameter with precise tolerance control eliminates bushing requirements while maintaining alignment in machinery, automation systems, and precision instruments. Manufactured from 18-8 stainless steel, it resists corrosion in demanding environments including manufacturing, marine, and chemical processing applications. The integrated nylon patch thread locker provides permanent vibration resistance without requiring separate locking components, simplifying assembly while ensuring reliability in high-cycle equipment. The 4-40 UNC coarse thread design offers quick installation and high pull-out strength, making it ideal for securing moving components in assemblies where maintenance access is limited.

Specification Summary & Compliance

This shoulder screw features Class 2A thread fit per UNC standards with precise shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental compliance for global industrial applications. The right-hand coarse thread configuration provides reliable engagement while the standardized socket head profile ensures compatibility with common industrial tools.