S-94361A389 5/8"-18 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 Rockwell C32 hardness, this shoulder screw withstands high-stress applications without deformation.
- Precision Thread Fit – Class 3A thread tolerance ensures secure, vibration-resistant fastening in demanding assemblies.
- Corrosion & Wear Resistance – Black oxide finish provides durable protection against rust and extends service life in harsh environments.
- Secure Grip & Easy Installation – Knurled head and 3/8" hex drive allow for firm handling and efficient torque application during assembly.
- Accurate Shoulder Alignment – Tight shoulder diameter and length tolerances maintain precise component positioning in machinery and fixtures.
- Fine Thread Reliability – 5/8"-18 UNF fine threads offer superior clamping force and reduced loosening under dynamic loads.
- Regulatory Compliance – Meets RoHS 3 and REACH standards, ensuring safe use in regulated industrial and export markets.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and durability challenges in industrial equipment. The Class 3A thread fit and fine UNF threading provide exceptional resistance to vibration loosening, making it ideal for precision assemblies in automation systems, motor mounts, and rotating machinery. The black oxide finish enhances corrosion resistance, while the knurled socket head ensures secure tool engagement during high-torque installation. With a robust shoulder diameter of 3/4" and controlled tolerances, it maintains exact component spacing in jigs, pivots, and bearing supports, reducing wear and maintenance downtime.
Specification Summary & Compliance
This shoulder screw adheres to UNF thread standards with a Class 3A thread fit for precision fastening. Shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005". It is manufactured from alloy steel and complies with RoHS 3 (2015/863/EU) under exemption 6(a) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met.
