S-90969A350 5/16"-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 Tensile Strength: Withstands up to 140,000 psi for reliable performance in high-stress applications.
- Precision Alignment: Features a 1-1/4" shoulder with tight tolerances for accurate component positioning and reduced wear.
- Corrosion Resistance: Black oxide finish provides durable protection against rust in demanding industrial environments.
- Secure Fastening: Class 3A thread fit ensures tight, vibration-resistant connections with superior holding power.
- Easy Installation: Hex drive and knurled ultra-low socket head allow for quick, slip-resistant tool engagement.
- Material Durability: Alloy steel construction with Rockwell C30 hardness offers long-lasting mechanical strength.
- Regulatory Compliance: Meets RoHS 3 and REACH standards for safe, environmentally conscious manufacturing use.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery, automation systems, and precision equipment. The 5/16"-18 UNC coarse thread with Class 3A fit provides secure fastening that resists loosening under vibration, while the precisely machined 1-1/4" shoulder ensures components like gears, pulleys, and linkages maintain exact positioning without misalignment. The black oxide finish enhances corrosion resistance, extending service life in harsh conditions. Its ultra-low socket head with knurling offers efficient space-saving installation, making it ideal for applications where clearance is limited but high tensile strength is non-negotiable.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precision tolerance. Shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring consistent dimensional accuracy. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmentally responsible industrial use.
