S-91251A500 8-36 x 1 1/4" 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 industrial applications, reducing the risk of fastener failure.
- Precise Class 3A thread fit provides superior engagement and vibration resistance, ideal for machinery requiring tight tolerances.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable finish, extending service life in harsh environments.
- Fine UNF thread spacing delivers improved clamping force and better load distribution compared to coarse threads.
- Partially threaded design allows for secure fastening in specific zones while minimizing thread damage during installation.
- Hex socket drive enables easy installation with standard tools, reducing assembly time and improving workplace efficiency.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial use.
Professional Applications & Engineering Value
These 8-36 UNF Socket Head Cap Screws are engineered from black-oxide alloy steel to address critical challenges in precision assembly and heavy-duty machinery. The Class 3A thread fit and fine thread spacing provide excellent resistance to loosening under vibration, making them ideal for automotive, aerospace, and manufacturing equipment. With a Rockwell C37 hardness and high tensile strength, they withstand extreme loads without stripping or shearing. The partially threaded rod design concentrates strength where needed, reducing weight and preventing cross-threading. These screws are a trusted solution for applications demanding reliability, durability, and compliance with international standards.
Specification Summary & Compliance
This product adheres to Class 3A thread fit per UNF standards, ensuring precise dimensional accuracy. It meets ASTM A574 specifications for alloy steel socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious industrial use.
