S-94383A290 1/4"-20 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications
• Precision shoulder alignment with tight diameter tolerance (-0.004" to -0.002") and length tolerance (-0.005" to 0.005") ensuring accurate component positioning
• Superior corrosion resistance through black oxide finish providing enhanced protection in industrial environments
• High-strength alloy steel construction hardened to Rockwell C32 for excellent durability and wear resistance
• Secure installation and removal with hex socket drive and knurled head texture for improved grip during torque application
• Precise thread engagement with Class 3A UNC coarse threads offering superior fit and vibration resistance
• Industry compliance assurance meeting ASME B18.3 specifications while being RoHS 3 and REACH compliant

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers exceptional engineering value in precision assembly applications where accurate alignment and high load capacity are critical. The 2" shoulder length with tight manufacturing tolerances provides precise bearing surfaces for rotating components, eliminating the need for additional spacers or bushings. The black oxide finish enhances corrosion resistance while maintaining dimensional stability in harsh industrial environments. The Class 3A thread fit and UNC coarse threading ensure secure fastening in high-vibration applications, while the hex socket drive with knurled head facilitates easy installation in confined spaces. These shoulder screws are engineered to solve alignment challenges in machinery, automotive, and manufacturing equipment where precision and reliability are paramount.

Specification Summary & Compliance

This precision shoulder screw features 1/4"-20 UNC coarse threads with Class 3A thread fit for superior engagement. The shoulder maintains tight dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured from alloy steel hardened to Rockwell C32, the screw meets ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.