S-90298A728 3/8"-16 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
- Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
- Precise component alignment with 4" shoulder length held to tight ±0.005" tolerance for reliable assembly fit
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Secure fastening capability with Class 3A thread fit and 3/8"-16 UNC coarse threads for vibration resistance
- Easy installation and removal featuring hex socket drive and knurled head for superior grip during tool operation
- Industry compliance assurance meeting ASME B18.3 specifications for dimensional accuracy and reliability
- Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries
Professional Applications & Engineering Value
This stainless steel shoulder screw delivers exceptional engineering value in precision applications where component alignment and durability are critical. The 4" shoulder length with tight ±0.005" tolerance ensures precise bearing surfaces and pivot points in machinery assemblies, while the Class 3A thread fit provides secure fastening in high-vibration environments. The 18-8 stainless steel material with passivated finish offers superior corrosion resistance, making it ideal for industrial equipment, automation systems, and manufacturing machinery exposed to moisture or chemicals. The hex socket drive combined with the knurled head facilitates easy installation in confined spaces, reducing assembly time and improving maintenance efficiency.
Specification Summary & Compliance
This precision shoulder screw features 3/8"-16 UNC Class 3A threads with coarse thread spacing for optimal engagement. The shoulder diameter maintains -0.001" to 0.001" tolerance while the 4" shoulder length is held to ±0.005" tolerance. Manufactured to ASME B18.3 specifications, the screw delivers consistent dimensional accuracy and performance. The component is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for industrial applications worldwide.
