S-8077A272 7/8"-9 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi shear strength to withstand high-stress applications
• Precise alignment and bearing surface provided by the precision-machined shoulder with controlled diameter and length tolerances
• Reliable thread engagement with Class 3A fit and UNC coarse threads for secure fastening and vibration resistance
• Enhanced grip and tool engagement from the knurled head and 5/8" hex drive for easier installation and removal
• Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe, sustainable industrial use

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw delivers critical performance in demanding industrial applications where precision alignment and corrosion resistance are paramount. The Black Oxide finish enhances surface durability while providing additional corrosion protection in challenging environments. Engineered with a Class 3A thread fit and UNC coarse threads, this fastener ensures reliable performance in high-vibration machinery, automated equipment, and precision assembly systems. The precisely machined shoulder provides an accurate locating surface for rotating components, bearings, and linkages, eliminating the need for additional spacers or bushings. With its knurled head and hex drive design, installation and maintenance are simplified, reducing assembly time while maintaining the integrity of critical mechanical systems.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with 7/8"-9 UNC coarse threads, ensuring tight tolerances for reliable fastening. The shoulder diameter maintains -0.004" to -0.002" tolerance with shoulder length controlled to -0.005" to 0.005" for precise component alignment. Manufactured to ASME B18.3 standards with Rockwell B79 hardness, this fastener delivers consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry requirements for hazardous substance restrictions.