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Washers · DIN 6798 · Application guide

What Are Serrated Lock Washers Used For?

What Are Serrated Lock Washers Used For? application image

Serrated Lock Washers (DIN 6798) are specified where the joint requires load distribution and anti-loosening under a bolt or nut. The sections below cover the typical end-uses by industry, the size and material decisions for each, assembly practice, and the applications this fastener type is not suited to. Stocked across roughly M3 to M20, they cover general to heavy-duty work.

Typical Applications for Serrated Lock Washers

The most common settings where these are specified:

  • Bolted structural joints: spreading load over soft or oversized holes and protecting the surface.
  • Vibration applications: spring and serrated types that maintain tension under cyclic load.
  • Timber & soft materials: large-OD types that prevent pull-through.
  • General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
  • Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.

How to Specify Serrated Lock Washers for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans M3–M20; check the full table below for the exact dimensions of each size.
  • Type & OD: Select flat for load spreading, spring/serrated for anti-loosening, or fender/large-OD for soft or oversized holes.
  • Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
  • Standard: This product is supplied to DIN 6798. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Installation & Assembly Practice

  • Place the washer under the rotating element (usually the nut) so tightening does not score the surface.
  • Chamfered-hole side of a hardened washer faces the bolt head fillet.
  • On serrated-flange hardware, do not add a plain washer — it defeats the serrations.

Common Selection Mistakes with Serrated Lock Washers

  • Relying on a spring washer for locking on class 8.8+ joints — at high preload it flattens and adds nothing.
  • Choosing an OD too small for soft material, so the head pulls through or embeds.

Where Serrated Lock Washers Are Not the Right Choice

A washer does not replace a locking feature on its own in severe vibration, and a spring washer adds little clamp on high-strength joints.

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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Set the size and options in the drawing above, then send the exact configuration straight to this form.

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Specification
Business Information

Dimensions & Specifications (DIN 6798)

For sizeInner diameter d1 (mm)Outer diameter d2 (mm)Thickness h (mm)TypeReference standard
M33.26.00.5Internal-tooth type ADIN 6798 A/J
M44.37.60.5Internal-tooth type ADIN 6798 A/J
M55.39.20.6Internal-tooth type ADIN 6798 A/J
M66.411.00.7Internal-tooth type ADIN 6798 A/J
M88.414.80.8Internal-tooth type ADIN 6798 A/J
M1010.518.00.9Internal-tooth type ADIN 6798 A/J
M1213.021.51.0Internal-tooth type ADIN 6798 A/J
M1617.027.01.2Internal-tooth type ADIN 6798 A/J
M2021.033.01.5Internal-tooth type ADIN 6798 A/J
M33.27.00.5External-tooth type JDIN 6798 A/J
M44.39.00.5External-tooth type JDIN 6798 A/J
M55.310.00.6External-tooth type JDIN 6798 A/J
M66.412.00.7External-tooth type JDIN 6798 A/J
M88.415.00.8External-tooth type JDIN 6798 A/J
M1010.519.00.9External-tooth type JDIN 6798 A/J
M1213.022.01.0External-tooth type JDIN 6798 A/J
M1617.028.01.2External-tooth type JDIN 6798 A/J
M2021.034.01.5External-tooth type JDIN 6798 A/J

Frequently Asked Questions

Do Serrated Lock Washers actually stop bolts loosening?

Spring and serrated washers help maintain tension under light vibration, but for critical joints a prevailing-torque locking nut or adhesive is more reliable. Flat washers mainly spread load and protect the surface.

What material should Serrated Lock Washers be for outdoor use?

For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate.

Are Serrated Lock Washers made to a recognized standard?

Yes — they are manufactured to DIN 6798, so dimensions are interchangeable between suppliers when you quote the standard on your order.

What are Serrated Lock Washers used for?

Load distribution and anti-loosening under a bolt or nut. They are supplied to DIN 6798.

Can I get a quote for Serrated Lock Washers in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.