S-8077A669 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 in harsh environments thanks to 316 stainless steel construction and protective black oxide finish.
- Exceptional assembly precision and reliable thread engagement ensured by the Class 3A thread fit and 1/4"-28 UNF fine thread.
- High mechanical strength for demanding applications with a 70,000 psi tensile strength and 35,000 psi minimum shear strength.
- Secure, non-slip installation provided by the hex socket drive and knurled head for improved grip during tightening.
- Accurate component alignment and spacing with a precisely machined shoulder featuring tight diameter and length tolerances.
- Broad industry compliance and material safety, meeting ASME B18.3 specifications and being RoHS 3 & REACH compliant.
- Enhanced durability and long service life from a Rockwell B79 hardness rating, resisting wear and deformation.
Professional Applications & Engineering Value
This shoulder screw is engineered to solve critical alignment and pivot point challenges in industrial machinery, automotive assemblies, and precision instruments. The 316 stainless steel material and black oxide finish provide excellent resistance to corrosion from chemicals, moisture, and salt spray, making it ideal for harsh operating environments. The Class 3A thread fit on the 1/4"-28 UNF fine thread ensures vibration resistance and prevents loosening in dynamic applications. The unthreaded shoulder acts as a precise bearing surface or pivot, reducing wear on mating parts and simplifying assembly. Its hex socket drive and knurled head allow for secure tool engagement and manual adjustment, enhancing installation efficiency and reliability in tight spaces.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit for high precision, conforming to the ASME B18.3 standard. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring exact dimensional control. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing the use of safe, restricted-substance-free materials in line with the latest environmental directives.
