S-91251A175 5-40 x 1 1/2" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head 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 of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Class 3A thread fit provides superior precision and tighter tolerances, enabling secure, vibration-resistant assemblies.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, non-galling surface for extended service life.
- Hex socket drive design allows for high torque application and easy installation in confined spaces with standard 3/32" hex keys.
- Partially threaded shank with a minimum 3/4" thread length provides optimal grip and alignment in tapped holes, improving joint integrity.
- Rockwell C37 hardness ensures high wear resistance and durability under repetitive loading conditions.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global industrial use.
Professional Applications & Engineering Value
This 5-40 UNC socket head cap screw is engineered to address critical challenges in precision machinery, automotive, and heavy equipment assemblies. The black-oxide alloy steel construction combats rust and wear, while the coarse UNC thread and Class 3A fit ensure rapid installation and superior resistance to loosening under dynamic loads. Its partially threaded design concentrates clamping force where needed, minimizing stress concentration and enhancing joint reliability. Ideal for applications requiring high tensile strength and consistent performance, this screw simplifies maintenance and reduces downtime in demanding environments.
Specification Summary & Compliance
This screw adheres to Class 3A thread tolerances per UNC standards, with a thread size of 5-40 and a minimum thread length of 3/4". Manufactured in compliance with ASTM A574 for material integrity, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international industrial use.
