S-91327A133 1/4"-20 ASME B18.3 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
- Vibration-resistant locking with nylon patch thread locker maintains secure fastening in temperatures from -50° to 250° F, preventing loosening in dynamic industrial environments.
- Exceptional corrosion resistance from 18-8 stainless steel construction and passivated finish ensures long-term reliability in harsh conditions.
- Precision alignment capability with 2" shoulder length and controlled diameter tolerance provides stable bearing surfaces for rotating components.
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness withstands heavy mechanical loads and stress.
- Secure installation through Class 3A thread fit and hex socket drive enables precise torque application and prevents stripping.
- Industry-standard compatibility with UNC coarse threading and ASME B18.3 specifications ensures reliable interchangeability.
- Environmental compliance meeting RoHS 3 and REACH regulations makes it suitable for regulated industries.
Professional Applications & Engineering Value
This stainless steel shoulder screw solves critical alignment and vibration challenges in precision assemblies. The 2" shoulder length with tight diameter tolerance provides exact positioning for rotating parts in machinery, while the nylon patch thread locker eliminates maintenance downtime caused by vibration-induced loosening. The 18-8 stainless steel material with passivated finish resists chemical exposure and corrosion in manufacturing environments. With 70,000 psi tensile strength, it maintains structural integrity in high-stress applications like automation equipment, bearing retention, and precision linkages. The hex socket drive allows flush installation in confined spaces, making it ideal for industrial fastening applications requiring both precision and reliability.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision engagement. Features 1/4"-20 UNC coarse threads with 7/16" thread length and 5/16" shoulder diameter (-0.004" to -0.002" tolerance). Shoulder length maintains -0.005" to 0.005" tolerance for precise component alignment. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.
