S-91259A488 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 durability with 140,000 psi tensile strength and Rockwell C32 hardness for reliable performance in high-stress applications.
- Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
- Precise alignment and secure mounting with a 1/2" shoulder diameter and standard shoulder fit, minimizing component movement.
- Easy and secure installation using the knurled socket head with 1/4" hex drive, preventing tool slippage during tightening.
- High thread reliability with Class 3A UNC coarse threads, ensuring consistent engagement and reducing cross-threading risks.
- Broad compatibility with ASME B18.3 standards, guaranteeing interchangeability and quality in mechanical assemblies.
- Environmentally responsible use as it is RoHS 3 and REACH compliant, meeting global regulatory requirements.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and load-bearing challenges in precision machinery. Made from alloy steel, it offers high tensile strength and hardness, ideal for applications like rotating shafts, pivots, and spacers where exact positioning is essential. The black oxide finish enhances corrosion resistance, reducing maintenance in humid or abrasive settings. Its UNC coarse threads and Class 3A fit provide quick assembly with minimal risk of stripping, while the knurled socket head ensures firm tool grip for consistent torque application. Commonly used in automotive, aerospace, and industrial equipment, this screw delivers reliable performance in dynamic environments, supporting smooth operation and extended component life.
Specification Summary & Compliance
This shoulder screw adheres to precise dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It features Class 3A thread fit and UNC coarse threads (3/8"-16) for secure fastening. Manufactured in compliance with ASME B18.3 specifications and ASTM A574 material standards, it ensures consistent quality. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, supporting safe and sustainable industrial use.
