S-91273A574 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and prolonged service life.
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against rust and reducing maintenance needs.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads, minimizing the risk of fastener failure in critical assemblies.
• Precision shoulder design with a 2-1/2" length and standard fit, allowing for accurate alignment and smooth rotational movement in machinery.
• Easy installation and removal thanks to the hex socket drive and knurled head, providing secure grip and reducing tool slippage during tightening.
• Consistent thread engagement with UNC coarse threads and Class 2A fit, ensuring quick assembly and reducing cross-threading issues.
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and meets global standards for industrial applications.

Professional Applications & Engineering Value

This 1/4"-20 shoulder screw is engineered to address common industrial challenges, such as misalignment and component wear in rotating assemblies. The 18-8 stainless steel material offers superior resistance to corrosion and oxidation, making it suitable for applications in automotive, aerospace, and manufacturing equipment where exposure to moisture or chemicals is frequent. The black oxide finish not only enhances aesthetic appeal but also reduces friction and galling, extending the screw's service life. With a knurled head and hex drive, it allows for efficient installation in tight spaces, while the UNC coarse threads provide reliable holding power in high-vibration environments. Ideal for precision machinery, conveyor systems, and robotic arms, this shoulder screw ensures stable performance and reduces downtime in demanding industrial applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a thread size of 1/4"-20 UNC with Class 2A thread fit for consistent tolerance. The shoulder diameter is 1/4" with a tolerance of -0.004" to -0.002", and the shoulder length is 2-1/2" with a tolerance of -0.005" to 0.005", ensuring accurate alignment. Manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, it meets environmental and safety regulations for global use.