S-91327A289 6-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Integrated nylon patch thread locker ensures secure fastening in high-vibration environments, maintaining integrity from -50° to 250°F.
• Superior corrosion resistance: Made from 18-8 stainless steel with passivated finish for excellent durability in harsh industrial conditions.
• Precise alignment and positioning: Standard shoulder fit with tight diameter and length tolerances enables accurate component mounting and reduces assembly errors.
• High-strength performance: 70,000 psi tensile strength and Rockwell B55 hardness provide reliable load-bearing capacity for demanding applications.
• Easy installation and removal: Hex socket drive allows for efficient torque application with standard tools, minimizing installation time.
• Industry-standard compliance: Meets ASME B18.3 specifications with Class 3A thread fit, ensuring interchangeability and consistent quality.
• Environmental responsibility: RoHS 3 and REACH compliant, supporting sustainable manufacturing practices without compromising performance.

Professional Applications & Engineering Value

This 6-32 UNC shoulder screw is engineered to address critical challenges in precision assembly, where misalignment and loosening under dynamic loads can lead to equipment failure. The 18-8 stainless steel construction combined with a passivated finish offers exceptional resistance to corrosion and wear, ideal for machinery, automotive, and electronics industries. The integrated nylon patch thread locker prevents back-off in vibrating environments, reducing maintenance needs. With a Class 3A thread fit and precise shoulder dimensions, it ensures accurate positioning of components like gears and pulleys, enhancing overall system reliability. Its hex socket drive facilitates quick installation in confined spaces, streamlining production workflows while meeting rigorous ASME B18.3 standards for consistent performance.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit tolerances for high precision, with UNC coarse threads (6-32 size) and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.