S-97745A140 1/4"-28 x 1 1/4" Hanger Bolts

Key Features & Benefits at a Glance

• 360° rotating head enables easy alignment and installation in confined spaces without removing the bolt
• Wrench flats provide secure gripping surfaces for reliable torque application during assembly
• Black-oxide steel construction offers enhanced corrosion resistance for extended service life in industrial environments
• Fine UNF thread spacing ensures superior vibration resistance and precise load distribution in spring applications
• Extended 7/8" minimum thread length delivers maximum engagement strength for critical extension spring connections
• RoHS 3 and REACH compliance guarantees environmental safety and regulatory acceptance for global manufacturing
• 5/64" hex size allows compatibility with standard tools while maintaining compact design

Professional Applications & Engineering Value

These 1/4"-28 UNF hanger bolts with black-oxide steel construction are engineered specifically for demanding extension spring applications where reliability and installation flexibility are critical. The 360° rotating head eliminates alignment issues during assembly, while the wrench flats ensure secure torque application without slippage. The fine thread spacing provides exceptional vibration resistance, preventing loosening in dynamic load conditions common in industrial machinery, automotive suspensions, and mechanical systems. The combination of right-hand thread direction and extended thread length creates optimal load distribution, making these studs ideal for permanent installations requiring consistent spring tension maintenance.

Specification Summary & Compliance

Manufactured to precise dimensional standards with UNF fine thread specifications (1/4"-28) and Class 2A thread tolerances. Features include 1 1/4" overall length, 7/8" minimum thread length, 1/4" diameter, and 0.15" hole diameter. Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance. The anchor-type stud design is specifically engineered for extension spring applications with right-hand thread orientation.