S-94328A950 1/4"-20 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 strength and durability with 140,000 psi tensile strength and Rockwell C30 hardness, ideal for high-stress applications.
- Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
- Precise alignment and reduced wear with Class 3A thread fit and standard shoulder fit, ensuring reliable performance in machinery.
- Easy installation and removal with a hex drive (5/32") and knurled, low-profile socket head for secure tool grip.
- Versatile coarse threading (1/4"-20 UNC) for quick assembly and strong holding power in various materials.
- Consistent dimensional accuracy with tight tolerances on shoulder diameter and length, minimizing assembly errors.
- Compliance with environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The black oxide finish provides excellent corrosion resistance, reducing maintenance needs in humid or chemically aggressive settings. With a 1/4"-20 UNC coarse thread and Class 3A fit, it ensures secure fastening and minimizes loosening under vibration, making it ideal for applications like pivots, guides, and rotating assemblies. The 7/16" shoulder length and precise tolerances allow for accurate component spacing and alignment, enhancing overall system reliability. Its high tensile strength and Rockwell C30 hardness support heavy-duty use in automotive, aerospace, and manufacturing sectors, where failure is not an option.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for superior precision. Dimensions include a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and shoulder length of 1" (tolerance: -0.005" to 0.005"), ensuring consistent performance. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmental safety and regulatory requirements in industrial applications.
