S-8077A846 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, ideal for harsh industrial environments and chemical exposure.
- Enhanced durability and wear resistance from the black oxide finish, providing long-lasting performance and reduced maintenance.
- High tensile and shear strength (70,000 psi and 35,000 psi respectively) ensures reliable load-bearing in demanding applications.
- Precise Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal risk of loosening.
- Easy installation and removal with a knurled socket head and 5/32" hex drive, improving assembly efficiency.
- Accurate shoulder diameter and length with tight tolerances for consistent alignment and spacing in machinery.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment and corrosion-induced failure. The black oxide finish enhances surface hardness and reduces friction, extending service life in high-wear applications like rotating assemblies and precision equipment. With a 1/4"-20 UNC coarse thread and Class 3A fit, it provides robust, vibration-resistant connections in machinery, automotive, and aerospace components. The knurled socket head allows for quick tool engagement, streamlining maintenance and reducing downtime. Ideal for use in industrial screws applications where consistent shoulder dimensions ensure accurate part positioning, this screw delivers reliable performance under heavy loads and harsh conditions.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a shoulder diameter of 5/16" with a tolerance of -0.004" to -0.002" and a shoulder length of 15/32" with a tolerance of -0.005" to 0.005". The UNC coarse thread adheres to Class 3A fit standards for tight, reliable fastening. It complies with ASME B18.3 specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory conformity for industrial use.
