S-91264A589 5/16"-18 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
- Vibration-resistant locking with nylon pellet thread locker ensures secure fastening in high-stress environments from -50° to 250°F.
- Exceptional tensile strength of 140,000 psi provides reliable load-bearing capacity for demanding industrial applications.
- Precision Class 3A thread fit guarantees consistent engagement and reduces assembly issues in automated or manual installations.
- Durable black oxide finish on alloy steel resists corrosion and extends service life in harsh operating conditions.
- Knurled socket head offers improved grip for tool engagement, reducing slippage during torque application.
- Rigid shoulder design with 3/8" diameter and 1 3/4" length maintains precise alignment in machinery and rotating assemblies.
- Compliance with ASME B18.3 and environmental standards ensures quality consistency and regulatory acceptance globally.
Professional Applications & Engineering Value
This alloy steel shoulder screw with a black oxide finish and 5/16"-18 UNC coarse thread is engineered to address critical alignment and vibration challenges in precision machinery. The knurled socket head enhances tool grip, preventing cam-out during high-torque installations, while the nylon pellet thread locker secures fasteners against loosening under dynamic loads. Ideal for industrial applications such as rotating shafts, conveyor systems, and assembly jigs, the screw’s Class 3A thread fit ensures minimal play and consistent performance. Its high tensile and shear strength (84,000 psi) supports heavy-duty use, reducing maintenance needs and downtime in manufacturing environments.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threading and precise shoulder dimensions (diameter: 3/8" with -0.004" to -0.002" tolerance; length: 1 3/4" with -0.005" to 0.005" tolerance). Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it meets RoHS 3 and REACH compliance for environmental safety. The design ensures reliable performance with Rockwell C32 hardness and adherence to standardized industrial protocols.
