S-91286A125 1/4"-20 x 2 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex 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 load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications.
- Superior corrosion resistance provided by the zinc-flake coating, extending service life in harsh industrial environments.
- High-strength Grade 8 classification and Rockwell C33 hardness ensure consistent durability and resistance to wear.
- Easy installation and removal with an external hex drive and coarse UNC threading, reducing assembly time.
- Precise thread fit (Class 2A) for secure fastening and vibration resistance in machinery and structural assemblies.
- Partial threading design allows for controlled clamping force and improved joint stability.
- Compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where failure is not an option. The steel material combined with 150,000 psi tensile strength and Rockwell C33 hardness ensures it withstands extreme loads and repetitive stress without deforming. The zinc-flake coated finish provides a robust barrier against corrosion, making it ideal for outdoor or chemically exposed environments. With its 1/4"-20 UNC coarse thread and external hex drive, it offers quick, secure fastening, reducing downtime in assembly lines. Whether used in structural frames, engine components, or industrial equipment, this screw delivers reliability that minimizes maintenance and enhances operational safety.
Specification Summary & Compliance
This fastener features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for precise tolerance and ease of assembly. It is manufactured in compliance with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, supporting safe and sustainable usage in global markets.
