Serrated Flange Nuts Manufacturer
MT.BOLTS manufactures Serrated Flange Nuts, which are specialized fastening components designed to provide secure and vibration-resistant assemblies without the need for washers. These nuts feature a built-in wide flange with serrations on the bearing surface that grip the mating material, distributing load and preventing loosening under dynamic loads. Commonly used in automotive, heavy machinery, and metal structures, serrated flange nuts reduce assembly time and enhance joint stability. MT.BOLTS offers these nuts in various sizes, materials, and finishes to meet global standards and project-specific requirements.
- System of Measurement:
- Metric (M6–M64) | Imperial (1/4″ to 2.5″)
- Height Range (Thickness):
- Metric: 4 mm to 60 mm
- Imperial: 5/32″ to 2-3/8″
- Thread Pitch:
- Metric: Coarse (default), Fine
- Imperial: UNC, UNF
- Thread Type:
- Right-hand thread (standard)
- Left-hand thread (optional)
- Nut Types:
- Serrated Flange Nut (standard type)
- Serrated Lock Flange Nut (for enhanced resistance to loosening)
- Prevailing Torque Serrated Flange Nut (optional, for critical joints)
Serrated Flange Nuts Material Types
MT.BOLTS supplies carbon steel, stainless steel, duplex steel, and nickel-based alloy Serrated Flange Nuts, meeting the demanding requirements of chemical, marine, and high-temperature environments, compliant with various international standards.
| Material Category | Common Grades/Models | Description |
| Carbon Steel | ASTM A307, A325, A490 | High strength and cost-effective, suitable for general structures; requires anti-corrosion coating. |
| Stainless Steel | 304 (A2), 316 (A4), 321, 410 | Excellent corrosion resistance; widely used in food, chemical, and construction industries |
| Duplex Stainless Steel | UNS S31803/S32205 (F51), UNS S32750 (F53) | High strength with superior chloride corrosion resistance; used in seawater, petrochemical, and paper industries |
| Monel Alloys | Monel 400, Monel K500 | Excellent seawater corrosion resistance and mechanical strength; used in marine engineering and pump systems |
| Hastelloy Alloys | Hastelloy C276, C22, B2, X | Excellent resistance to strong acids and oxidizing media; widely used in chemical equipment and flue gas desulfurization |
| Inconel Alloys | Inconel 600, 625, 718 | Resistant to high temperature, pressure, and corrosion; used in heat exchangers, aerospace, and nuclear industries |
| Incoloy Alloys | Incoloy 800, 825, 925 | Ideal for high-temperature acidic environments; widely used in petroleum refining and heat treating systems |
| Nickel Alloys | Nickel 200, 201 | Pure or high-nickel alloys with excellent conductivity and alkali resistance; used in electronics and chemical applications |
Serrated Flange Nuts System of Measurement
Serrated flange nuts are available in both metric and imperial systems to meet global application needs:
- Metric Sizes: M5 to M24 (larger sizes available on request)
- Imperial Sizes: 1/4″ to 1″ (UNC/UNF threads)
- Thread Pitch:
- Metric: Coarse (default), Fine (optional)
- Imperial: UNC (Unified Coarse), UNF (Unified Fine)
- Thread Direction:
- Right-hand thread (standard)
- Left-hand thread (available for specific applications)
- Height Range: Varies by diameter; typically 5 mm to 25 mm for metric nuts
- Flange Diameter: Generally 1.5 to 2 times the nominal thread diameter
Serrated Flange Nuts Common Standards
Serrated flange nuts are manufactured according to international standards that ensure uniformity in dimensions, performance, and thread compatibility:
- DIN 6923 – Hex flange nuts with or without serration (metric)
- ISO 4161 – Hex flange nuts, with metric threads and standard flange dimensions
- ASME B18.2.2 – Flange nuts (inch series) for general industrial use
- SAE J995 – Mechanical and material properties for inch-series nuts
- GB/T 6177.1 – Chinese standard for hex flange nuts
- Custom / OEM Standards – For automotive, machinery, or specialized assemblies
Serrated Flange Nuts Surface Finishes
- Zinc-plated – Corrosion resistance in indoor environments
- Hot-dip galvanized – Excellent protection in outdoor/marine use
- Black oxide – Mild corrosion resistance, often for aesthetic or indoor use
- Passivated – Used on stainless steel bolts to improve corrosion resistance
- Custom Coatings (e.g., PTFE) – Non-stick, chemical-resistant for harsh environments
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Benefits and Limitations of Serrated Flange Nuts
Advantages
- Integrated Washer Function: The flange eliminates the need for a separate washer
- Anti-Loosening Feature: Serrations provide locking action by gripping the mating surface
- Load Distribution: The flange distributes pressure over a wider area, reducing surface damage
- Time-Saving Installation: Fewer components and quicker assembly
- Prevents Vibration Loosening: Ideal for dynamic and mechanical joints
Disadvantages
- Not Suitable for Soft Surfaces: Serrations can damage painted or soft substrates
- One-Time Use Preferred: Repeated use may reduce locking effectiveness
- Surface Marks: Can leave permanent marks or scratches on the contact surface
- Directional Use Only: Serrations work effectively in one direction of tightening
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Serrated Flange Nuts Applications
Serrated flange nuts are used in applications where vibration resistance, secure clamping, and simplified installation are critical:
- Automotive Industry: Engine mounts, chassis, suspension, and exhaust systems
- Machinery and Equipment: Vibration-prone joints and assemblies
- Construction and Steel Structures: Metal framing, brackets, rail systems
- Electronics and Appliances: Mounting parts that require tight fastening
- Renewable Energy Systems: Wind turbine assemblies and solar panel frames
- Agricultural and Mining Equipment: Harsh environments with heavy vibration
FAQ About Serrated Flange Nuts
The serrations act as a locking mechanism that grips the mating surface to prevent loosening under vibration.
While possible, reuse is not recommended for critical joints as serration wear may reduce effectiveness.
No, the built-in flange serves the purpose of a washer by distributing load and preventing loosening.
Not ideal, as the serrations may damage the surface; consider non-serrated flange nuts or add a protective washer.
Yes, MT.BOLTS offers serrated flange nuts in stainless steel, zinc-plated, hot-dip galvanized, black oxide, and other finishes.
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