Flange Bolts

Flange Bolts

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Product Dimensions

ParameterSpecification
Product TypeFlange Bolt
Head TypeHex Head with Integrated Flange
Size RangeM6 – M24 (custom sizes available)
Material OptionsStainless Steel, Carbon Steel, Alloy Steel, Mild Steel
StandardsDIN 6921, ISO, BS, ASTM
Surface FinishZinc Plated, Hot-dip Galvanized, Phosphate Coated, Black Oxide

Industrial Applications

Flange Bolts are widely used in:

  • Electrical panels and assemblies: Provide firm fastening with fewer components by eliminating extra washers.
  • Automotive industry: Commonly used in engines, transmissions, and chassis assemblies for vibration-resistant fastening.
  • Construction and heavy machinery: Secure structural and mechanical components in demanding applications.
  • Agricultural equipment: Offer high clamping strength for machinery exposed to outdoor conditions.
  • Oil, gas, and power sectors: Used in high-pressure and vibration-prone environments for stable connections.

Product Description

Flange Bolts are designed with a hexagonal head and a circular flange beneath, which distributes the fastening pressure over a larger surface. This design improves load distribution, prevents loosening under vibration, and reduces assembly time by eliminating separate washers. Flange bolts are available with serrated or non-serrated flanges, serrated types provide additional locking power, while non-serrated offer smooth load distribution. Due to their strength and reliability, flange bolts are widely used in automotive, construction, and heavy equipment industries.

Product specifications

  • Head Design: Hex head with integrated flange
  • Types: Serrated flange bolts (anti-loosening) and non-serrated flange bolts (smooth load distribution)
  • Thread Type: Metric ISO coarse/fine; UNC/UNF available on request
  • Size Range: M6 – M24; lengths from 15 mm up to 200 mm (custom available)
  • Material Options: Stainless steel (304/316), carbon steel, mild steel, alloy steel (grade 8.8, 10.9, 12.9)
  • Surface Finish: Zinc plating, hot-dip galvanization, phosphate coating, black oxide, plain finish
  • Flange Diameter: Proportional to bolt size; typically 1.5–2 times nominal diameter
  • Tensile Strength: Up to 1,200 MPa depending on grade
  • Shear Strength: ~60% of tensile rating (material dependent)
  • Locking Mechanism: Serrated flange bites into material to prevent loosening under vibration
  • Operating Temperature: -50°C to +400°C depending on base material and finish
  • Corrosion Resistance: Excellent with stainless steel and galvanization for outdoor/harsh environments
  • Applications: Automotive fasteners, heavy machinery, construction frameworks, engines, and industrial assemblies
  • Standards/Compliance: DIN 6921, ISO 4162, BS, ASTM specifications
  • RoHS/REACH Compliance: Available for coatings and stainless variants

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