S-97768A302 1/4"-28 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 black oxide finish, ideal for harsh industrial environments
- Precise component alignment through knurled head and standard shoulder fit, ensuring stable assembly and reduced vibration
- High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Reliable thread engagement with Class 3A UNF fine threading, providing secure fastening in high-vibration settings
- Easy installation and removal using standard 5/32" hex drive, compatible with common industrial tools
- Compliance with industry standards including ASME B18.3, ensuring dimensional accuracy and interchangeability
- Environmental regulation adherence with RoHS 3 and REACH compliance, meeting global manufacturing requirements
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw with black oxide finish addresses critical challenges in precision machinery and industrial equipment. The UNF fine threading (1/4"-28) combined with Class 3A thread fit prevents loosening under vibration, while the knurled socket head enhances grip during installation. The standardized shoulder diameter (5/16") and length (3/8") provide consistent spacing and rotational support in assemblies such as rotating shafts, pivots, and gear mechanisms. With Rockwell B55 hardness and corrosion-resistant properties, it delivers long-term reliability in automotive, aerospace, and manufacturing applications where dimensional stability and tensile strength are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with precise dimensional tolerances: shoulder diameter (-0.004" to -0.002") and length (-0.005" to 0.005"). Features UNF fine threads (1/4"-28) with Class 3A thread fit for superior engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability.
