S-8077A829 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
- Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for reliable, high-load applications
- Precision thread engagement with Class 3A UNC threads ensuring secure, vibration-resistant fastening
- Easy installation and removal featuring a knurled socket head with 5/32" hex drive for improved tool grip
- Accurate shoulder positioning with controlled diameter and length tolerances for precise component alignment
- Compliance with industry standards including ASME B18.3 for consistent quality and performance
- Environmental regulation compliance meeting RoHS 3 and REACH requirements for safe usage
Professional Applications & Engineering Value
This 316 Stainless Steel shoulder screw with Black Oxide finish delivers critical performance in demanding applications where corrosion resistance and mechanical reliability are paramount. The Class 3A UNC thread provides superior thread engagement, reducing the risk of loosening under vibration in machinery, automation systems, and precision equipment. The knurled socket head with hex drive ensures secure tool engagement during installation, while the precisely controlled shoulder dimensions maintain accurate component alignment in assemblies. With high tensile and shear strength, this fastener withstands substantial loads in industrial machinery, manufacturing equipment, and transportation applications where failure is not an option.
Specification Summary & Compliance
This shoulder screw features 1/4"-20 UNC coarse threads with Class 3A fit for precision threading applications. The shoulder maintains tight dimensional tolerances with diameter control of -0.004" to -0.002" and length control of -0.005" to 0.005". Manufactured to ASME B18.3 specifications with material hardness of Rockwell B79. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant for environmental safety regulations.
