S-91273A421 M8 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 shoulder positioning with a consistent 8mm diameter and minimal tolerance, ensuring accurate component alignment.
• High mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications.
• Secure, non-slip installation via the knurled socket head and 4mm hex drive, preventing tool slippage and damage.
• Reliable thread engagement with Class 5g6g fit and coarse 1.25mm pitch, enabling quick assembly and vibration resistance.
• Durable and hard-wearing material with Rockwell B55 hardness, resisting wear and deformation under load.
• Compliant with global standards including RoHS 3 and REACH, ensuring environmental and safety regulations are met.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to solve critical alignment and durability challenges in industrial assemblies. The 18-8 Stainless Steel provides excellent corrosion resistance, making it suitable for machinery, automotive, and electronic applications exposed to moisture or chemicals. The precise shoulder diameter and length ensure components like gears, pulleys, and linkages are accurately positioned, reducing wear and misalignment. The knurled socket head with a 4mm hex drive allows for secure torque application, minimizing stripping and enhancing installation efficiency. With a coarse thread pitch and Class 5g6g thread fit, it offers robust performance in high-vibration environments, ensuring long-term reliability and reduced maintenance.

Specification Summary & Compliance

This shoulder screw adheres to metric thread standards with an M8x1.25mm coarse pitch and Class 5g6g thread fit for precise tolerance. The shoulder features a diameter of 8 mm with a tolerance of -0.04 to -0.01 mm and a length of 5 mm with a tolerance of 0 to 0.25 mm, ensuring consistent performance. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and sustainable industrial use.