S-91247A333 7/16"-20 x 4 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
- Precise UNF fine threading provides improved vibration resistance and secure fastening in critical assemblies.
- Class 2A thread fit offers consistent, easy assembly while maintaining tight tolerances for dependable connections.
- Grade 5 hardness (Rockwell C25) delivers excellent durability and wear resistance for repeated use.
- External hex drive design allows for high-torque installation with standard tools, speeding up assembly processes.
- Partial threading enables optimal clamp force distribution, ideal for applications requiring precise joint control.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The UNF fine thread configuration enhances grip strength in softer materials and provides superior resistance to dynamic loads, making it ideal for machinery, automotive, and structural applications. Constructed from zinc-plated steel, it offers reliable corrosion protection in outdoor or humid conditions, while the external hex drive ensures quick, high-torque installation with common tools. Its 120,000 psi tensile strength and Rockwell C25 hardness guarantee long-term performance under heavy-duty operational stresses, reducing maintenance frequency and downtime.
Specification Summary & Compliance
This fastener features a 7/16"-20 UNF fine thread with Class 2A thread fit for consistent dimensional accuracy. It complies with ASME B18.2.1 and SAE J429 manufacturing standards, ensuring interoperability and quality. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.
