S-91259A458 2-56 ASTM A108 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional durability with 140,000 psi tensile strength and Rockwell C32 hardness for reliable performance in demanding applications
- Superior corrosion resistance through black oxide finish, extending service life in harsh industrial environments
- Precision thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
- Easy installation and removal with 5/64" hex drive socket and knurled head for improved grip during assembly
- Stable shoulder alignment featuring precise 3/32" diameter shoulder for accurate component positioning
- Wide compatibility with UNC coarse threads and right-hand direction for standard industrial applications
- Regulatory compliance meeting ASTM A108 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These alloy steel shoulder screws deliver critical performance advantages in precision machinery and industrial equipment. The black oxide finish provides essential corrosion protection while maintaining dimensional stability, crucial for applications exposed to moisture or chemicals. The Class 3A thread fit ensures minimal backlash and secure fastening in vibrating environments, while the knurled head texture facilitates installation in confined spaces. The precisely machined shoulder diameter acts as a reliable pivot point or spacer in assemblies requiring accurate component alignment. These socket head shoulder screws are engineered to maintain integrity under high stress conditions, making them ideal for robotics, automotive components, and precision manufacturing equipment where reliable fastening solutions are paramount.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit and UNC coarse thread profile ensuring precise engagement. The shoulder features tight tolerances with diameter maintained at -0.004" to -0.002" and length controlled within -0.005" to 0.005". These shoulder screws comply with ASTM A108 material specifications and meet environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring they're suitable for global industrial applications requiring verified material safety and performance standards.
