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Hexagon Flange Nuts Manufacturer for High-Vibration Joints
Better Fastener Industry Co., Ltd. manufactures Hexagon Flange Nuts in carbon steel and stainless steel for automotive chassis, power equipment, industrial motors and structural assemblies. The flange base spreads clamping load and adds frictional contact, so many joints can be secured without a separate flat washer.
Our range covers metric and inch series flange nuts to DIN 6923, ISO 4161 and ASME/ANSI B18.2.2, with property classes 8 and 10 available in carbon steel. We produce standard parts and custom configurations from drawings or samples, supported by in-house nut machinery, heat treatment and surface finishing.
What We Manufacture
Hexagon flange nuts combine a standard hex body with a wide circular flange. The flange face distributes preload over a larger area than a plain nut, reducing the risk of substrate deformation and providing inherent resistance to rotational loosening in dynamic joints. We supply these nuts as part of a broader nut and fastener program that includes Hexagon Nuts, Lock Nuts and matching Washers.
DIN 6923 Flange Nuts
Metric coarse and fine thread flange nuts for general mechanical and automotive use. Available in classes 8 and 10 with zinc plating or dacromet.
ASME B18.2.2 Flange Nuts
Inch series hex flange nuts for North American equipment and structural connections, produced to T12-HF dimensions.
DIN 6331 Heavy Flange Nuts
Heavy hex flange nuts for higher load capacity in construction machinery and mining equipment.
Application Fit and Joint Design
Flange nuts are selected where vibration, limited washer access or soft mating surfaces affect joint reliability. Typical applications include automotive suspension and chassis, electric motor mounts, power transmission equipment, agricultural machinery and rail components. The flange contact area is most effective on flat or slightly crowned surfaces; for slotted or irregular substrates, a hardened washer may still be specified.
| Joint Condition | Recommended Flange Nut | Material / Finish |
|---|---|---|
| High vibration, dynamic load | DIN 6923 class 10, serrated flange optional | Carbon steel, zinc plated |
| Outdoor / corrosive environment | DIN 6923 or ASME B18.2.2 | Stainless steel A2/A4 or hot-dip galvanized |
| Soft or thin sheet metal | Large flange diameter variant | Carbon steel, dacromet |
| High-temperature exhaust / engine | DIN 6331 heavy flange nut | Alloy steel, plain or phosphate |
Materials, Grades and Surface Treatment
- Carbon steel: property classes 8 and 10 to ISO 898-2, with proof load and hardness verified per batch.
- Stainless steel: A2 (304) and A4 (316) for corrosion resistance in marine, chemical and food equipment.
- Low-alloy steel: for heavy flange nuts requiring higher tensile strength.
- Zinc electroplating: standard corrosion protection for indoor and mildly corrosive service.
- Hot-dip galvanizing: thicker zinc layer for outdoor structures and long service life.
- Dacromet: zinc-aluminium flake coating for automotive and high-corrosion applications, with controlled friction.
Critical Specifications We Confirm
Every flange nut order is defined by thread size, pitch, across-flats, flange diameter, flange thickness, overall height, property class and coating. We verify these dimensions against the nominated standard and the mating bolt or stud. For custom parts, we work from customer drawings or samples and confirm tolerances before production.
Thread and fit: metric coarse and fine threads, inch UNC/UNF, and custom pitches. We check thread gauging with go/no-go gauges and confirm class of fit to the drawing.
Quality Assurance and Acceptance
Our in-house laboratory is equipped with a spectrometer, CMM, X-ray flaw detector and mechanical testing equipment. We monitor chemical composition, mechanical properties, non-destructive testing and geometric dimensions. Inspections are conducted after each production process, and finished products undergo final inspection in accordance with customer requirements and international standards.
For flange nuts, typical acceptance criteria include proof load, hardness, thread gauge, flange diameter and coating thickness. We can supply inspection certificates and test reports with each shipment. Our quality system is certified to ISO 9001.
Configuration and Customization
Beyond standard DIN, ISO and ASME flange nuts, we produce custom configurations including non-standard flange diameters, serrated flange faces, left-hand threads, special heights and integrated washer assemblies. Custom production is our core business; we develop and manufacture from drawings or samples.
- Serrated or smooth flange face
- Metric or inch thread forms
- Special coatings and colors
- Kitted or assembled with matching bolts and washers
Packaging, Logistics and Documentation
We offer flexible packaging including bulk cartons, small boxes, blister packs and custom retail kits. Our location is within a two-hour drive of Shanghai and Ningbo ports, supporting efficient sea freight and air freight for urgent deliveries. Documentation includes packing lists, material certificates and inspection reports as required.
Information We Use to Configure Your Solution
To prepare an accurate proposal for hexagon flange nuts, we need the following project inputs. This allows us to confirm the correct standard, material, grade and finish, and to quote a realistic lead time.
- Thread size, pitch and standard (DIN, ISO, ASME, JIS or custom)
- Material and property class
- Surface treatment and corrosion requirement
- Flange diameter and overall height, if non-standard
- Annual volume and order frequency
- Packaging and labeling requirements
- Any inspection or certification requirements
- Destination port or delivery address
Frequently Asked Questions
What standards do your hexagon flange nuts meet?
We manufacture to DIN 6923, ISO 4161, ASME/ANSI B18.2.2 and DIN 6331, among others. We can also produce to customer drawings or samples.
Can you supply flange nuts in stainless steel?
Yes. We produce A2 (304) and A4 (316) stainless steel flange nuts for corrosive environments, as well as carbon steel and low-alloy steel grades.
Do you provide test certificates?
Yes. We can provide material certificates, dimensional inspection reports and mechanical property test reports as required for your project.
What is your production capacity for flange nuts?
Our annual production capacity exceeds 20,000 tons across our fastener lines, with 12 modern production lines and in-house heat treatment and surface finishing.
How do you handle custom flange nut requirements?
We develop and manufacture from your drawings or samples. Our engineering team reviews the specification and confirms dimensions, material and finish before production.
What is the typical lead time?
Lead time depends on quantity, material and finishing requirements. We confirm a production schedule when quoting and keep you informed of progress.
Better Fastener Industry Co., Ltd. is a China-based fastener manufacturer and supplier with over 25 years of experience. We combine in-house nut production, heat treatment, surface finishing and laboratory testing to deliver hexagon flange nuts that meet your drawing and application requirements.
