EN 1662 Hexagon Flange Bolt

EN 1662‑1997 hexagon flange bolt (small series) is European standard flange bolt, available in F‑type, U‑type and R‑type flange head styles. Size range M5‑M16, M14 is non‑preferred size. Integrated flange bearing surface removes the requirement for extra flat washers. Larger contact area reduces risk of workpiece crushing and delivers reliable anti‑vibration performance. Widely used for European‑spec agricultural machinery, construction machinery, auto spare parts and general equipment. Small‑series design features compact flange outer diameter for lightweight assemblies with limited installation clearance. Please adjust according to actual product standards and application conditions to avoid over‑promising.

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Product Description

Product Parameter Specifications

Parameter	Details
Product Name	EN 1662 Hexagon Flange Bolt, Small Series
Standard	EN 1662‑1997
Head Types	F‑type, U‑type, R‑type flange head
Thread Sizes	M5, M6, M8, M10, M12, (M14), M16; M14 non‑preferred
Thread	Metric coarse thread, full / partial thread optional
Strength Class	8.8, 10.9, 12.9 high strength
Material	Carbon alloy steel, 304 / 316 stainless steel
Surface Finish	Zinc plated, color zinc, zinc‑nickel, hot‑dip galvanized, black oxide
Structure	Hex drive with integrated flange face, small‑series lightweight construction
Matching Nut	Preferred match EN1661 flange nut, also compatible with standard metric hex nuts
Applications	EU‑spec agricultural machinery, construction machinery, auto parts, light‑duty equipment frames
Quality Control	Dimensional check, thread go‑no‑go gauge, hardness, flange flatness, head angle inspection
Supply Capacity	Stock for regular sizes, bulk export orders supported, custom lengths available

Core Product Advantages

Genuine EN1662 EU standard for drawing compliance

Manufactured strictly to EN1662‑1997. F/U/R three flange head variants fully match European engineering drawings. Solve fitting issues compared with DIN6921 flange bolts for EU‑origin projects.

Integrated flange face, washer‑free assembly

One‑piece flange under hex head removes need for separate flat washers. Reduce bill‑of‑material count, speed‑up mass assembly and eliminate risks caused by missing washers.

Small‑series compact dimension for limited space

Small‑series flange with reduced outer diameter, compact overall size. Well‑suited for positions with narrow installation space and supports equipment lightweight design.

Even pressure distribution and stable anti‑vibration performance

Extended flange spreads clamping force over larger contact area, preventing indentation or collapse on thin sheet, aluminium and cast‑iron substrates. Maintains reliable clamping under continuous vibration conditions.

Multiple strength & finish options for diverse environments

8.8‑12.9 high‑strength grades for heavy‑duty loads; stainless steel for humid corrosive conditions. Zinc‑nickel and hot‑dip galvanized finishes meet overseas salt‑spray requirements.

Production Process

Raw‑material selection Alloy steel and stainless steel wire with mechanical properties meeting EU bolt requirements.

Cold heading Multi‑station cold forging forms hex head and F/U/R‑shaped flange in one operation, guaranteeing head angle and flat flange surface.

Thread rolling Precision thread rolling for full thread profile, pass go‑no‑go gauge for smooth mating.

Heat treatment Quenched & tempered for class 8.8‑12.9 to balance hardness and fatigue resistance.

Anti‑corrosion finishing Electro‑plating, zinc‑nickel, hot‑dip galvanizing or black oxide upon request.

EU‑standard inspection Verify flange diameter, head angle, shank length, thread and hardness, distinguish F/U/R head styles.

Sorting & packing Separate packing by size and head style with clear batch marking for export shipments.

Application Industries

Agricultural machinery Frame fasteners for harvesters and seeders, withstand field vibration and outdoor humidity.

Construction machinery Fastening for small‑size construction equipment, handling machines and support brackets.

Automotive spare parts Export EU auto components, chassis auxiliary parts and body sheet‑metal connections.

EU‑spec complete equipment Automation machinery, general‑purpose machine frames and cabinet assemblies according to European drawings.

Light‑duty steel structures Light supports and guardrails for space‑restricted bolted joints.

Installation & Usage Notes

1. Confirm head type Specify F‑type / U‑type / R‑type per drawing; different head versions cannot be interchanged arbitrarily.

2. Washer recommendation No extra flat washer required for general applications; add washers only as specified for heavy‑load conditions.

3. Tightening torque Apply torque corresponding to bolt size and strength class, avoid flange crushing or bolt fracture from over‑torque.

4. Nut matching Prefer EN‑standard nuts to achieve correct thread‑fit performance.

5. Clean mating surface Remove burrs and debris before installation to ensure full contact between flange and workpiece.

6. Periodic check Re‑check bolt tension for equipment working under long‑term vibration.

Why Choose Our EN 1662 Flange Bolts

We manufacture EN1662‑1997 small‑series hexagon flange bolts, supplying F‑type, U‑type and R‑type head options. Strictly produced according to European standards to match EU machinery drawings. Flat flange face, qualified thread and stable batch performance. Stock available for M5‑M16 regular sizes, fast delivery for bulk export orders. Material certificates and mechanical test reports are available for agricultural machinery, construction machinery and automotive export projects.