S-91327A282 4-40 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
- Permanent vibration resistance with nylon patch locking that maintains secure fastening in dynamic environments
- Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish for extended service life
- High strength reliability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Precision alignment capability through controlled 1/8" shoulder diameter with tight tolerances for accurate component positioning
- Wide temperature compatibility with locking performance maintained from -50° to 250°F across various operating conditions
- Secure installation via hex socket drive that prevents cam-out and ensures proper torque application
- Industry-standard compatibility with UNC coarse threads and Class 3A fit for reliable interchangeability
Professional Applications & Engineering Value
This 4-40 UNC thread shoulder screw with nylon patch locking technology addresses critical challenges in precision assembly applications where vibration-induced loosening can compromise system integrity. The 18-8 stainless steel construction combined with passivated finish provides exceptional corrosion resistance for harsh environments, while the precisely machined shoulder ensures accurate alignment of components in machinery, automation systems, and electronic enclosures. The hex socket drive allows for secure installation in confined spaces, and the Class 3A thread fit guarantees consistent performance in high-vibration industrial equipment, robotics, and precision instruments where reliability is paramount.
Specification Summary & Compliance
This shoulder screw features precision dimensions including 1/8" shoulder diameter (-0.004" to -0.002" tolerance) and 1/4" shoulder length (-0.005" to 0.005" tolerance) with Class 3A thread fit for superior engagement. Manufactured to ASME B18.3 specifications and compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring both mechanical precision and regulatory adherence for global industrial applications.
