Hexagon head flange bolt

Hexagon Head Flange Bolt - Grade 5 Titanium | DIN6921 Standard

LINHUI TITANIUM uses Grade 5 titanium alloy to carefully create hexagon head flange bolt products that closely adhere to DIN6921 specifications. Our bolts include strength ratings of 4.8, 8.8, 10.9, and 12.9 and come in M5, M6, M8, M10, and M12 sizes.

The integrated flange design of each flange bolt reduces substrate damage by spreading clamping loads over a larger surface area, doing away with the need for separate washers. Surface treatments for enhanced corrosion resistance include zinc and galvanized coatings.

Our production method, which guarantees dimensional precision under ±0.05mm tolerance, is complemented by ISO9001, ISO14001, IATF16949, and ROHS certifications. We service demanding applications in the automotive, marine engineering, and aerospace industries with over 200 tons of inventory that can be supplied in three to seven days.

Key Features & Benefits

Compared to conventional bolt-washer combinations, our flange bolt reduces assembly time by 40% by adding washer functionality. In high-stress situations, the serrated flange design's ability to prevent loosening under vibration is essential.

Grade 5 titanium material maintains outstanding corrosion resistance in acidic and chloride environments while providing a strength-to-weight ratio four times better than steel. According to ASTM B117, surface treatments increase the service life in salt spray testing by more than 300 hours.

The bigger bearing surface maintains the joint intact during heat cycling from -40°C to 150°C by preventing embedment into softer materials like aluminum.

Product Information For Hexagon head flange bolt

Manufacturing Process

We employ cold heading technology for bolt shank formation, ensuring uniform grain structure and superior tensile strength. Thread rolling (not cutting) work-hardens the surface, increasing fatigue resistance by 25%.

Heat treatment involves solution annealing at 920°C followed by controlled air cooling to achieve optimal hardness (HRC 32-38). Flange faces undergo precision machining to maintain flatness within 0.1mm.

Surface coating applies zinc or galvanization through electroplating with minimum thickness of 8μm. Post-treatment hydrogen embrittlement relief baking is mandatory for grades 10.9 and above, preventing delayed failure.

Quality Inspection

Using go/no-go gauges for thread pitch and breadth across flats, every batch is subjected to 100% dimensional verification. According to ISO 898-1, tensile testing verifies minimum breaking stresses of 800–1220 MPa, depending on grade.

The Vickers method of micro-hardness testing looks for surface decarburization below a depth of 0.02 mm. Coating performance exceeding 240 hours for conventional applications and 720 hours for marine-grade treatments is validated by salt spray testing.

SGS, TÜV, and DNV offer third-party inspection services. Heat number tracking is included with complete EN 10204 3.1 material traceability certificates.

Applications

In the automotive industry, vibration resistance is crucial for suspension systems, engine mounts, and transmission housing. Under heat cycling, torque retention is maintained by the flange design.

Aerospace Assembly: FAA material requirements are met while aircraft weight is decreased because to lightweight titanium construction. utilized in interior fittings and non-structural panel fastening.

Marine Engineering: In deck hardware, railing systems, and equipment installation, stainless steel versions withstand corrosion from saltwater. Electrical bonding for grounding needs is ensured by serrated flanges.

Solar Panel Mounting: Under wind loads and temperature changes, weatherproof coatings and anti-loosening properties are advantageous for outdoor installations.

Export Markets

In North America (USA, Canada, Mexico), Europe (Germany, France, UK), the Middle East (UAE, Saudi Arabia), and Asia-Pacific (Japan, South Korea, Australia), we ship flange bolt products to more than 60 countries.

Our ability to satisfy strict international procurement requirements is demonstrated by our established collaborations with CEFC, PTT, PETRONAS, and LUKOIL. Barrier-free customs clearance is ensured by adherence to REACH, RoHS, and NORSOK M-650.

Production workshop

Why Choose Us

Direct mill supply maintains factory-level quality control while reducing prices by 15–20% by eliminating middlemen. Our 200-ton inventory enables same-day quotations and 3–7 day delivery for standard sizes.

The engineering support team creates special requirements and provides guidance on choosing materials. Multilingual services in Arabic, Chinese, Spanish, and English facilitate easy communication.

A variable MOQ, beginning at 100 kg, supports trial orders. Rush production is available with a 15-day turnaround time for urgent situations.​​​​​​​

Packaging & Shipping

Bolts are packed in moisture-proof poly bags, then placed in reinforced carton boxes (25kg/box) or wooden crates for bulk orders. Each package includes material certificates and inspection reports.

Shipping via DHL, FedEx for samples (3-5 days), and sea freight for bulk orders (20-35 days). FOB Xi'an, CIF, and DDP terms available. Export documentation includes commercial invoice, packing list, and certificate of origin.

FAQ

Q: What torque should I apply to M8 Grade 8.8 bolts?

A: Approximately 25-28 Nm for dry conditions. Grade 10.9 requires 35-40 Nm. Always verify based on your specific coating friction coefficient.

Q: Serrated or non-serrated flanges?

A: Choose serrated for vibration-prone steel assemblies. Non-serrated works better with aluminum or where surface protection matters.

Q: Can these replace standard bolts with washers?

A: Yes. The integrated design eliminates washer migration and maintains preload better under dynamic loads.

Q: What makes titanium superior to steel?

A: Titanium is 60% lighter, has better resistance to corrosion, and can withstand temperatures as high as 300°C without losing strength.

Q: How can titanium bolts be kept from galling?

A: To prevent friction heat accumulation, we use anti-seize coatings and advise restricted installation torque.

Request a Quote

Ready to improve your assembly efficiency with our Grade 5 titanium Hexagon head flange bolt? Contact our engineering team at linhui@lhtitanium.com for technical specifications, pricing, and sample requests. Fast quotation within 4 hours guaranteed.