S-91273A335 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life
• Precise component alignment with a consistent 18mm shoulder length (±0.25mm tolerance) for reliable assembly and reduced wear
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
• Secure, non-slip fastening enabled by the knurled hex socket head and 2mm hex drive for maximum torque transfer
• Accurate and reliable threading with Class 5g6g fit M3x0.5 coarse pitch, ensuring easy installation and vibration resistance
• Durable material hardness of Rockwell B55 provides excellent wear resistance and maintains thread integrity
• Compliance with environmental regulations including RoHS 3 and REACH, making it suitable for global industrial supply chains

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, which is vital for equipment in manufacturing, automation, and outdoor applications. The 18mm shoulder with tight length tolerance ensures precise spacing and rotational alignment of components like gears, pulleys, and linkages, reducing eccentric loads and premature failure. The coarse pitch thread (M3x0.5) and Class 5g6g thread fit facilitate quick assembly and provide reliable holding power in vibrating environments. Combined with the knurled hex socket head, it allows for high-torque installation without slippage, making it a trusted choice for machinery, electronic enclosures, and precision instruments where accuracy and longevity are paramount.

Specification Summary & Compliance

This shoulder screw features a metric M3x0.5 coarse pitch thread with a Class 5g6g thread fit for standard industrial use. The shoulder diameter is 3mm with a tolerance of -0.04 to -0.01 mm, and the shoulder length is 18mm with a 0 to 0.25 mm tolerance, ensuring high dimensional accuracy. It is manufactured from 18-8 stainless steel with a hardness of Rockwell B55, tensile strength of 70,000 psi, and minimum shear strength of 35,000 psi. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to stringent environmental and safety standards for industrial components.