S-8077A343 5/16"-18 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
• Precise alignment and reduced wear through the precisely machined shoulder with tight diameter tolerance of -0.004" to -0.002"
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding industrial applications
• Secure, non-slip installation with knurled head and 1/4" hex drive for positive tool engagement
• Reliable thread engagement with Class 3A thread fit and 5/16"-18 UNC coarse threads for vibration resistance
• Industry compliance assurance meeting ASME B18.3 specifications and RoHS 3/REACH environmental regulations
• Versatile mounting capability with 3/8" shoulder length providing stable bearing surfaces for rotating components

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw with Black Oxide finish provides exceptional engineering value in precision assembly applications where corrosion resistance and dimensional stability are critical. The Class 3A thread fit ensures minimal backlash in high-vibration environments, while the precisely controlled shoulder diameter tolerance (-0.004" to -0.002") guarantees accurate component alignment in machinery, automation systems, and precision instruments. The knurled socket head with 1/4" hex drive prevents tool slippage during installation, reducing assembly time and potential damage. Ideal for industrial applications requiring reliable pivot points, bearing surfaces, or precise spacing components, this 5/16"-18 UNC coarse thread shoulder screw maintains integrity in chemically aggressive environments while providing the mechanical strength needed for heavy-duty use.

Specification Summary & Compliance

This precision shoulder screw features 5/16"-18 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 to ASME B18.3 specifications with material hardness of Rockwell B79, tensile strength of 70,000 psi, and minimum shear strength of 35,000 psi. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.