S-8077A815 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments and extended service life.
• Precise alignment and reduced wear due to the 4 1/2" shoulder with controlled tolerances, ensuring accurate component positioning.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications.
• Reliable, secure fastening with Class 3A thread fit and coarse UNC threads, providing excellent vibration resistance and ease of assembly.
• Easy installation and removal featuring a knurled socket head with a 5/32" hex drive, allowing for high-torque application without slippage.
• Consistent hardness and durability with a Rockwell B79 rating, ensuring the screw maintains its integrity under repeated stress.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The 4 1/2" shoulder length with tight diameter and length tolerances ensures exact spacing and alignment of moving parts, reducing friction and premature wear. The coarse 1/4"-20 UNC threads with a Class 3A fit provide superior grip and vibration resistance, crucial for dynamic loads. Combined with the Black Oxide finish on corrosion-resistant 316 stainless steel, it excels in moist or chemically aggressive settings, offering long-term reliability and reducing maintenance downtime. The socket head with knurling allows for secure tool engagement, making it a top choice for applications requiring high torque and precise assembly in industrial and engineering contexts.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for high accuracy and a shoulder diameter tolerance of -0.004" to -0.002" with a length tolerance of -0.005" to 0.005". It conforms to ASME B18.3 specifications for consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international industrial use.