S-94361A332 1/4"-28 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
- Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
- Black oxide finish offers enhanced corrosion resistance, extending the screw's service life in various industrial conditions.
- Knurled socket head with hex drive allows for secure tool grip and easy installation, even in confined spaces.
- Alloy steel construction with Rockwell C32 hardness delivers excellent durability and wear resistance for long-term use.
- Fine UNF threads enable finer adjustments and stronger holding power compared to coarse threads.
- RoHS and REACH compliance ensures environmental and safety standards are met, supporting sustainable manufacturing practices.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in high-stress industrial applications, such as machinery assemblies, automotive components, and precision equipment. The 1/4"-28 UNF fine thread and Class 3A fit provide superior clamping force and vibration resistance, preventing joint failure in dynamic operations. The black oxide finish not only enhances corrosion protection but also reduces galling during installation. With a knurled socket head and hex drive, it ensures easy, slip-free tightening in confined spaces, improving assembly efficiency and reliability for engineers and maintenance professionals.
Specification Summary & Compliance
This shoulder screw adheres to UNF thread standards with a Class 3A thread fit for high precision. Dimensions include a 1/4"-28 thread size, 5/16" shoulder diameter with a tolerance of -0.004" to -0.002", and 1 1/8" shoulder length with a tolerance of -0.005" to 0.005". It meets RoHS 3 (2015/863/EU) with exemption 6(a) and is REACH (EC 1907/2006) compliant, ensuring environmental and regulatory adherence for industrial use.
