S-91264A650 3/8"-16 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 shear strength, this screw reliably handles high-stress applications without failure.
- Vibration-Resistant Locking: Integrated nylon pellet thread locker prevents loosening under dynamic loads, maintaining clamp force from -50° to 250°F.
- Precision Shoulder Alignment
- Corrosion-Resistant Protection: Black oxide finish offers enhanced rust resistance in demanding industrial environments.
- Superior Material Durability: Alloy steel construction with Rockwell C32 hardness ensures long-term wear resistance and dimensional stability.
- Easy Installation & Maintenance: Hex socket drive allows high-torque installation in confined spaces with standard tools.
- Industry Standard Compliance: Manufactured to ASME B18.3 specifications for guaranteed interchangeability and performance.
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw delivers critical engineering solutions where precise alignment and rotational control are paramount. The alloy steel construction combined with Class 3A thread fit ensures zero-play assembly in precision machinery, jigs, and rotating assemblies. The black oxide finish provides corrosion protection for industrial environments while the knurled head facilitates manual adjustments. The integrated nylon pellet thread locker maintains fastener integrity in high-vibration applications from automotive fixtures to packaging equipment, eliminating the need for separate locking components. The generous 3" shoulder length accommodates multiple component stacks while maintaining concentricity, making it ideal for pivot points, bearing retention, and precision linkages.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior precision. Shoulder diameter tolerance maintained at -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Meets ASTM A574 material specifications for consistent quality and performance.
