S-91259A124 5/8"-11 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 shear and tensile strength with 84,000 psi minimum shear and 140,000 psi tensile ratings for reliable performance in high-stress applications.
- Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
- Precision shoulder fit with controlled diameter and length tolerances ensures accurate alignment and reduced assembly play.
- High-strength alloy steel construction with Rockwell C32 hardness provides excellent durability and wear resistance.
- Secure, non-slip installation enabled by the knurled head and 3/8" hex socket drive for firm tool grip.
- Reliable thread engagement with Class 3A UNC coarse threads offering consistent, vibration-resistant fastening.
- Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH for assured quality and environmental safety.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and load-bearing challenges in demanding machinery. The precision shoulder diameter of 3/4" with tight tolerances acts as a dependable pivot or axle, minimizing radial movement in assemblies like rotating shafts, linkages, and jigs. The black oxide finish enhances corrosion resistance, making it suitable for automotive, aerospace, and heavy equipment applications exposed to oils and moisture. With its 5/8"-11 UNC coarse thread and Class 3A fit, it ensures rapid assembly and high resistance to loosening under vibration. The knurled socket head allows for secure tool engagement, reducing slippage during torque application and improving installation efficiency in confined spaces.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise, uniform engagement. The shoulder features a diameter of 3/4" (tolerance: -0.004" to -0.002") and length of 1" (tolerance: -0.005" to 0.005") to ensure exact positioning. Manufactured from alloy steel under ASTM A574, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for regulated industrial and international markets.
