S-90318A101 2-56 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 stainless steel construction and passivated finish for long-lasting performance in harsh environments
• High-strength reliability with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding mechanical applications
• Precise shoulder alignment with controlled diameter and length tolerances ensuring accurate component positioning
• Space-saving ultra-low profile socket head design enables flush mounting in compact assemblies
• Consistent thread engagement with Class 2A UNC coarse threads providing reliable fastening in various materials
• Superior drive stability with 1/16" hex socket preventing cam-out during installation
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

These precision shoulder screws deliver critical engineering value in applications requiring exact component spacing and alignment. The 316 stainless steel construction with passivated finish provides superior resistance to chemicals, saltwater, and industrial atmospheres, making them ideal for marine equipment, chemical processing machinery, and food processing applications. The ultra-low socket head profile allows for flush mounting in space-constrained designs while maintaining high torque capability. The precisely controlled shoulder diameter and length ensure accurate bearing surfaces for rotating components, eliminating the need for additional spacers or washers. With Class 2A UNC threads and Rockwell B70 hardness, these screws maintain dimensional stability under vibration and load, reducing maintenance requirements in precision instruments, optical equipment, and automated assembly systems.

Specification Summary & Compliance

These shoulder screws feature Class 2A thread fit with UNC coarse threading (2-56) ensuring proper engagement in various materials. The precision shoulder maintains tight diameter tolerance (-0.001" to 0") and length tolerance (0" to 0.002") for accurate component positioning. Manufactured to industrial standards with Rockwell B70 hardness and 70,000 psi tensile strength, these fasteners comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and restricted substance control.