Internal/External Tooth Lock Washers

Internal Tooth Lock Washer

An internal tooth lock washer features teeth along the inside diameter of the washer. When tightened, these teeth engage the fastener and mating surface to increase friction and help resist loosening. Their compact outer profile makes them useful in applications where space is limited or where a smooth outside edge is preferred.
 

External Tooth Lock Washer 

An external tooth lock washer features teeth around the outside diameter of the washer. These teeth engage a surface when tightened, increasing friction to help resist loosening. The external tooth design provides a wider area of contact and is commonly used with larger fastener heads in electrical, mechanical, and general assembly applications.

DW Fastener carries a wide range of washers for a wide range of fastening and assembly applications. If you're unsure which washer is right for your application or can't find what you're looking for, our sales team is ready to help at sales@dwfastener.com, or 330-848-2891 option 2.