High-Performance Hex Flange Lock Nuts: The Ultimate Vibration-Proof Solution
At Handan Bolt, we engineer safety into every turn. Our Hex Flange Lock Nuts combine the holding power of a wide flange with the security of a prevailing torque locking feature. Manufactured in our ISO-certified facility in Yongnian, China, these nuts are designed to stay tight even under severe vibration. We supply both DIN 6926 (Nylon Insert) and DIN 6927 (All-Metal) standards to automotive manufacturers, heavy machinery builders, and railway contractors worldwide.
What is a Flange Lock Nut?
A Locknut (Read more on Wikipedia) is a nut that resists loosening under vibration and torque. Our Flange Lock Nut integrates two key features:
- Integrated Flange: The wide base acts like a built-in washer, distributing the clamping load over a larger area. This protects the mating surface and covers oversized holes.
- Locking Mechanism: Unlike a standard nut that spins freely, a lock nut has a “prevailing torque” feature that creates friction against the bolt threads, preventing it from backing off.
DIN 6926 vs. DIN 6927: Choosing the Right Standard
We manufacture both types mentioned in your specifications, suited for different environments:
1. DIN 6926 (Nylon Insert Flange Lock Nut)
This type features a ring of durable nylon (polyamide) embedded in the top of the nut.
- How it works: As the bolt threads into the nylon ring, the nylon deforms elastically, creating a tight grip around the bolt.
- Best for: General industrial use, automotive chassis, and environments where temperature is below 120°C. It offers excellent vibration resistance and seals out moisture.
2. DIN 6927 (All-Metal Flange Lock Nut)
This type uses a deformed metal top (usually elliptical or crimped) to create the locking friction.
- How it works: The distorted threads at the top of the nut squeeze the bolt threads tightly.
- Best for: High-temperature applications (engine compartments, exhaust systems) or chemical environments where nylon would melt or degrade. It is extremely durable and reusable.
Material Grades and Strength
Lock nuts are critical safety components, so material quality is paramount. We offer:
- Grade 8 (High Tensile): The standard for automotive and structural applications. Compatible with Grade 8.8 bolts.
- Grade 10 (Ultra-High Tensile): Heat-treated alloy steel for heavy-duty machinery. Compatible with Grade 10.9 bolts.
- Grade 6: For lighter duty applications (often used with Grade 4.8 bolts).
Surface Treatment
To ensure smooth assembly and corrosion resistance, we apply premium coatings:
- Zinc Plated (Blue/White or Yellow): The most common finish. It provides good rust protection and lubricity for consistent torque-tension relationships.
- Zinc Flake (Geomet/Dacromet): Available upon request for high salt-spray resistance (1000 hours+), ideal for automotive OEM parts.
Common Applications
Our Flange Lock Nuts are the preferred choice in industries where reliability is non-negotiable:
- Automotive: Suspension systems, engine mounts, and wheel hubs.
- Heavy Equipment: Excavators and bulldozers where constant vibration would loosen standard nuts.
- Renewable Energy: Wind turbine towers and solar tracking systems.
- Robotics: Moving arms and joints requiring secure fastening.
Why Source from Handan Bolt?
Dual Capability: We are one of the few factories that can produce both Nylon Insert and All-Metal lock nuts on the same production line.
Quality Control: We perform “Prevailing Torque” testing on every batch to ensure the locking torque meets DIN/ISO standards.
Cost Efficiency: By combining the nut, washer, and locking washer into one piece, you save on inventory costs and assembly time.
Get a Direct Factory Quote
Are you looking to replace expensive brand-name lock nuts? Our factory offers the same performance at a fraction of the cost.
Need a price list for DIN 6926 or DIN 6927?
Please click here to Contact Our Sales Team for a Free Quote. We export globally!
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