Product Introduction
DIN6921 hex flange bolt is a specialized integrated fastener that combines a standard hex head, a built-in flange washer and threaded shank into one single piece. Different from common hex bolts, its enlarged flange face replaces separate flat washers, which simplifies assembly procedures and cuts down installation parts. Most versions are designed with serrated teeth on the bottom of the flange, creating excellent anti-slip and anti-loosening effects when fastened tightly.
Manufactured strictly in accordance with DIN6921 industrial standard, this bolt adopts one-piece forging and precision thread rolling technology. The overall structure is compact and sturdy, with uniform stress distribution during tightening. It will not deform or loosen easily even under continuous vibration, dynamic load and frequent working cycles.
We supply two mainstream material categories for diverse working scenarios. High-strength carbon steel in grade 8.8 and 10.9 is adopted for heavy machinery, vehicle components and general industrial assembly, featuring outstanding tensile strength, hardness and fatigue resistance. Stainless steel A2 and A4 options are tailored for outdoor environments, humid workshops, chemical workshops and marine applications, delivering remarkable rust prevention and corrosion resistance.
Multiple surface treatments are available including electro zinc plating, hot-dip galvanizing (HDG) and black oxide finish. Electro galvanizing is cost-effective for indoor use; HDG greatly enhances anti-rust ability for outdoor and outdoor engineering projects; black oxide treatment improves surface friction and wear resistance. Our product lineup covers complete sizes from M5 to M16 with various length specifications, sufficient in stock for prompt delivery. Custom non-standard sizes, special surface treatment and OEM processing are all acceptable to match personalized project demands.
All raw materials and finished goods go through multi-channel quality inspection, including hardness test, thread detection and load performance test, to ensure every batch of DIN6921 flange bolts meets standard requirements and maintains stable long-term use performance.
Product Features & Advantages
Integrated flange design, no need to match extra washers, greatly improving assembly efficiency and reducing spare part management cost.
Serrated flange surface increases friction between bolt and connected parts, effectively preventing loosening caused by vibration.
Complies fully with DIN6921 standard, precise dimension and standard thread, good interchangeability for global equipment maintenance and assembly.
One-piece forging process makes the whole body firm, strong bearing capacity, not easy to crack or break under heavy load.
Multiple materials and surface treatments optional, adaptable to indoor, outdoor, dry, humid and corrosive working environments.
Wide size coverage, stable supply capacity, suitable for bulk purchasing and long-term cooperative orders.
Detailed Specifications
Executive Standard: DIN6921
Product Name: Hex Flange Bolt / Serrated Flange Bolt
Material: Carbon Steel (Grade 8.8, 10.9); Stainless Steel (A2-70, A4-80)
Structure: Hex head + Integral serrated flange
Surface Treatment: Zinc Plated, Hot Dip Galvanized (HDG), Black Oxide, Plain Finish
Size Range: M5, M6, M8, M10, M12, M14, M16
Available Length: 10mm – 150mm
MOQ: 1000 pieces
HS Code: 73181590
Application Scope
This series of DIN6921 flange bolts are widely applied in scenarios that require anti-loosening and convenient installation. Typical fields include automobile manufacturing and auto parts assembly, general mechanical equipment, engineering machinery, electric power equipment, agricultural machinery, pipeline accessories, vehicle chassis, outdoor metal structures and furniture hardware. It is also a preferred fastener for automated production lines due to its simple assembly.
Packing & Logistics
Packing method: Inner plastic bag → small carton → outer carton → fixed with wooden pallet
Delivery time: 7-15 working days after receiving deposit
Loading port: Shanghai Port, Ningbo Port
Quality Certifications
ISO9001 Quality Management System Certification, SGS Inspection Report, Material Performance Test Report, Hardness Test Report
Trade Terms
Price terms: FOB, CFR, CIF, EXW
Payment methods: T/T, Irrevocable L/C at sight, Western Union
