S-93691A430 3/8"-16 MS51576-37, NASM51576 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high stress.
• Precise alignment and positioning ensured by a smooth, accurately machined 1/2" diameter shoulder with minimal tolerance.
• Easy and secure installation with a standard hex socket head, allowing for high torque application without slippage.
• Wide compatibility and reliable fastening due to the 3/8"-16 UNC coarse thread with Class 2A fit, suitable for various industrial assemblies.
• Compliance with stringent industry standards including MS51576-37, ensuring consistent quality and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address critical alignment and rotational control challenges in demanding assemblies. The 18-8 Stainless Steel construction, enhanced by a passivated finish, provides excellent resistance to corrosion and oxidation, making it suitable for applications in moist or chemically aggressive environments. The precisely ground 1/2" shoulder diameter and 5/8" shoulder length act as a dependable pivot or spacer, maintaining exact component positioning in machinery, automotive, and aerospace systems. The hex socket head design allows for compact installation in confined spaces, while the 3/8"-16 UNC coarse thread ensures quick assembly and high clamp load retention. Its compliance with MS51576-37 guarantees that it meets rigorous aerospace and defense specifications, providing engineers with a reliable, high-strength industrial fastener for critical linkages and rotating assemblies.

Specification Summary & Compliance

This shoulder screw features a Class 2A thread fit for consistent assembly and a precise shoulder with diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002". It conforms to UNC thread standards and is manufactured to meet MS51576-37 specifications. 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 safe for use in various international markets.