Integrated Load Distribution for Fast-Paced Assembly Lines
Eliminating the need for separate washers while ensuring uniform load distribution across mating surfaces is easily achieved with our high-performance flange bolt. We engineer this flange bolt with an integrated circular flange under the bolt head, which effectively spreads the clamping pressure over a larger surface area to prevent damage to soft mating materials like aluminum. Utilizing multi-station cold heading machines, we forge the head and flange of each flange bolt as a single, structurally sound piece, ensuring optimal grain flow and maximum fatigue life.
Automotive-Grade Reliability for Critical Structural Joints
Our manufacturing team regularly supplies high-quality flange bolt components to leading domestic and international automotive brands, including BYD, Chery, and SAIC. In compliance with IATF 16949 quality guidelines, we perform 100% automated optical inspection on every single flange bolt to guarantee perfect thread fit, flange flatness, and recess integrity. We can easily customize the flange face (with or without serrations), the drive style (hex, 12-point, or Torx), and the surface plating to meet your exact assembly demands, with custom samples available in 20 to 30 days.
Product Parameters
Design Standards
DIN 6921, EN 1665, ISO 8100, and customized customer blueprints
Flange Configurations
Plain (smooth) flange, serrated flange (anti-loosening design)
Thread Range
M5 to M20 (Metric and Imperial coarse/fine options)
Drive Options
Hex Head, Hexagon Socket, 12-Point Flange, Torx Flange
Applications
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Automobile engine exhaust manifolds, alternator brackets, and water pumps
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Chassis frame linkages, suspension control arm mounts, and differential gear casing
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Electric vehicle (EV) motor housings and high-voltage battery pack frames
Customization Capability
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We offer comprehensive customization of flange diameter, under-head serration profile, material chemistry, and specialized coating solutions.
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Development Lead Time: 20 days for standard variations; 30–45 days for complex custom flange bolts.
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Flexible MOQ: Highly adjustable order requirements to support engineering prototypes and pilot production runs.
Packaging & Shipping
Internal Protection
Bulk-packed in moisture-proof plastic bags to protect the threads and flange face.
External Packaging
Lined in reinforced double-wall cartons, stacked on pallets, and wrapped with protective shrink film.
Supported Terms
EXW, FOB, and DDP with complete door-to-door B2B logistics.
FAQ
Q: What is the purpose of the under-head serrations on a flange bolt?
A: The serrations grip the mating surface during installation, acting as an integrated locking mechanism to resist vibration-induced loosening.
Q: Do you offer environmentally compliant surface treatments for this product?
A: Yes, we offer chrome-free, environmentally compliant zinc flake, Geomet, and dacromet coatings that meet strict global automotive standards.
Q: What is the typical lead time for custom-engineered flange bolt samples?
A: We can complete die design, tooling setup, sample forging, and final quality checks to deliver physical prototypes within 20 to 30 days.
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