Serrated Flange Bolt/ Flange-Bolt 4.8 8.8 10.9 Grade Metal Hex Head Flange Bolt , Metric Hexagon Head Cap Yellow White Zinc Plated/Din6921/Gb5789

Key Applications
Flange bolts (also known as frame bolts or flange head bolts) are characterized by an integral, circular flange (washer-like bearing surface) directly beneath the bolt head. This flange distributes clamping force over a wider area than a standard bolt head, reducing surface pressure, preventing pull-through in softer materials, and often eliminating the need for a separate washer. This makes them suitable for a wide range of applications:
Piping Systems & Pressure Vessels:
Flanged pipe connections (ASME B16.5, B16.47, etc.) for oil & gas, chemical processing, water treatment, power generation (steam, water lines).
Pressure vessel manways, nozzles, and cover plates.
Pump and valve connections.
HVAC systems (high-pressure ducting, chillers).
Automotive & Transportation:
Engine assemblies (cylinder heads, manifolds - though often studs/nuts, bolts are used).
Transmission and drivetrain components.
Suspension systems (bushings, brackets).
Chassis and frame assembly.
Exhaust system components (manifolds, flanges).
Wheel mounting (lug bolts often have a flange).
Machinery & Industrial Equipment:
Assembly of heavy machinery frames, housings, and guards.
Mounting motors, gearboxes, and pumps.
Securing covers, access panels, and inspection ports on equipment.
Material handling equipment (conveyors, cranes).