S-94383A260 1/4"-20 ASME B18.3, ASTM A574 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 load-bearing capacity with 140,000 psi tensile strength and 84,000 psi minimum shear strength for reliable performance in high-stress applications.
- Superior corrosion resistance provided by the black oxide finish, extending service life in demanding industrial environments.
- Precision thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance.
- Enhanced durability from Rockwell C32 hardness and alloy steel construction, maintaining integrity under repeated use.
- Easy installation and removal with 5/32" hex drive and knurled head for improved grip and torque application.
- Accurate alignment and spacing thanks to the standard shoulder fit with tight diameter and length tolerances.
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-conscious procurement.
Professional Applications & Engineering Value
This alloy steel shoulder screw with 1/4"-20 UNC coarse thread and black oxide finish is engineered to address critical industrial fastening challenges. Its high tensile and shear strength makes it ideal for machinery, automotive assemblies, and precision equipment where vibration resistance and load distribution are paramount. The Class 3A thread fit ensures minimal backlash and secure connections, while the knurled socket head facilitates quick maintenance. The shoulder design provides precise component positioning, reducing wear and misalignment in rotational mechanisms and bearing mounts, delivering long-term reliability in harsh operating conditions.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A precision tolerance, ensuring exact fit and performance. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005" for consistent alignment. Manufactured to ASME B18.3 specifications with material compliance to ASTM A574, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting international environmental and safety standards for industrial use.
