DIN6797

Characteristics and Advantages of DIN 6797 Internal Tooth Lock Washer

Standardized geometry for consistent performance and cross-compatibility with metric fasteners

Uniform tooth spacing and angle to ensure balanced load distribution around the fastener

Precision stamping and controlled thickness to maintain mechanical integrity during installation

Compatibility with a wide range of bolt and screw sizes specified in the DIN 6797 series

Advantages of DIN 6797 internal tooth lock washers:

Reliable anti-rotation locking: The inward teeth grip the underside of the fastener head, resisting backward rotation under vibration or shock.

Enhanced contact stability: By maintaining constant engagement with the mating surfaces, the washer helps preserve preload.

Dimensionally consistent: Tight tolerances ensure predictable torque and clamping behavior in mass production and assembly lines.

Easy to install: Internal tooth lock washers are simple to fit under bolt heads or nuts without special tools, saving assembly time and reducing error.

Compliance with the DIN 6797 standard gives engineers and buyers confidence that the product will perform reliably across multiple applications, adhering to familiar European metric dimensions and mechanical criteria.

How Tooth Geometry Influences Friction and Locking Capability

The exceptional effectiveness of an internal tooth lock washer lies in its tooth geometry . The inward-facing serrations are not present for decoration—they are precision engineered to amplify friction and mechanical interference where it matters most.

How geometry improves performance:

Bite penetration: The angled teeth are designed to slightly bite into the underside of the fastener head and the mating surface when compressed. This creates a positive mechanical lock rather than relying only on friction between smooth surfaces.

Increased frictional resistance: The serrated interface dramatically increases surface roughness, making it significantly harder for rotation to initiate under vibration or dynamic thrust.

Balanced force distribution: Because teeth are uniformly spaced, torque applied during tightening is distributed evenly, preventing localized stress concentrations that could otherwise weaken the joint.

Enhanced preload retention: The geometry helps convert small micro-movements into resistance, helping maintain tension in the fastener even in fluctuating load conditions.

In essence, the tooth profile transforms a standard washer into a mechanical locking device : it does not just sit between surfaces but actively engages them to prevent unintended rotation.

What Fastening Problems Do Internal Tooth Lock Washers Solve Compared to Standard Flat Washers?

Standard flat washers serve primarily to distribute load and protect the contact surface from indentation or wear. While they offer important benefits in load distribution and surface preservation, they lack active locking functionality. Internal tooth lock washers address these limitations by solving a number of fastening challenges that flat washers cannot.

Key problems solved by internal tooth lock washers:

Vibration-induced loosening: Flat washers do not resist rotational movement; under vibration, nuts and bolts can gradually work loose. Internal tooth lock washers provide resistance through tooth engagement and increased friction.

Dynamic load instability: In assemblies subject to changing loads, flat washers cannot maintain preload. Internal tooth lock washers help preserve clamping force by inhibiting fastener rotation.

Unstable torque retention: When torque is applied and then released through dynamic forces, flat washers offer no additional resistance. Internal tooth lock washers ensure that torsional energy does not reduce joint integrity.

Limited grip on smooth surfaces: Flat washers can slip on polished surfaces. The serrated teeth of an internal lock washer bite into the material, creating an interlocking surface connection.