S-91271A770 1/2"-20 x 2 1/2" IFI 115 12-Point Screws
12-Point 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
- Superior tensile strength with 170,000 psi rating ensures reliable performance in high-stress industrial applications
- Precision Class 3A thread fit provides excellent engagement and vibration resistance in critical assemblies
- Integrated flange design eliminates the need for separate washers, simplifying installation and reducing component count
- Alloy steel construction with Rockwell C37 hardness delivers exceptional durability and wear resistance
- External 12-point drive system allows for high-torque installation in confined spaces with standard wrenching tools
- UNF fine threading offers superior resistance to loosening under vibration compared to coarse threads
- Partial threading provides optimal clamp load distribution while maintaining structural integrity
Professional Applications & Engineering Value
This 12-point flange screw addresses critical engineering challenges in heavy machinery, automotive, and industrial equipment where vibration resistance and reliable clamping force are paramount. The alloy steel composition, combined with Rockwell C37 hardness, ensures the fastener maintains its mechanical properties under extreme operating conditions. The UNF fine threading with Class 3A fit provides superior engagement in precision applications, reducing the risk of thread stripping and ensuring consistent preload. The integrated flange design distributes bearing stress over a wider surface area (0.75" diameter), protecting softer materials and eliminating washer-related complications in assembly processes.
Specification Summary & Compliance
This 12-point screw features precise 1/2"-20 UNF fine threading with Class 3A thread fit for exceptional dimensional accuracy. The partially threaded design provides 1-1/2" minimum thread length on a 2-1/2" overall length body. Manufacturing and performance specifications meet IFI 115 standards, ensuring consistent quality and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications with strict chemical substance restrictions.
