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Countersunk External Locking Washers.

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Countersunk External Locking Washers

What are Countersunk External Locking Washers?

Countersunk External Locking Washers are a specialised type of washer in the fastener industry. Designed with a unique conical configuration and external radial teeth, these washers fulfil the dual function of distributing load and maintaining a tenacious grip in the face of vibrational and torsional forces. Typically used in conjunction with countersunk screws or bolts, these washers fit snugly within the recessed area, delivering a clean, unbroken surface finish.

How Countersunk External Locking Washers Work.

The operational mechanics of Countersunk External Locking Washers lies in their distinctive structure and design. The conical form enables them to fit seamlessly within countersunk screw holes, contributing to a smooth, seamless assembly surface. The external teeth, when under the compressional force of the screw or bolt, bite into the substrate surface, thereby creating a ratchet-type action that resists loosening. This ratcheting feature significantly improves the fastener's resistance to vibration-induced loosening, making them indispensable for applications subjected to persistent mechanical movement.

What Material Countersunk External Locking Washers Are Made From.

Our Countersunk External Locking Washers are fabricated from A2 Stainless Steel, known for its impressive blend of mechanical strength and corrosion resistance. This grade of stainless steel ensures a durable and reliable washer that can withstand diverse environmental conditions, enhancing the longevity of your assemblies. For applications that require additional surface protection or a specific aesthetic, Accu provides an AccuBlack finish. This finish imparts a sleek, matte black surface, improving corrosion resistance while also reducing light glare, a feature valued in many precision engineering applications.

What Size and Type of Countersunk External Locking Washers Are Available.

At Accu, we cater to a wide range of fastening requirements. Our Countersunk External Locking Washers are available in an extensive range of sizes, from M2 (2mm) for precise, small-scale applications, to M30 (30mm) for larger, high-load assemblies. This breadth of offerings allows for the accurate selection of washers to meet the specific demands of your fastening challenge.


Q: What sets Countersunk External Locking Washers apart from standard flat washers?.

A: The primary distinction lies in their design and function. While both distribute load, Countersunk External Locking Washers also have external radial teeth that provide a locking feature by biting into the substrate surface, hence ensuring a secure and stable assembly even under vibrational or rotational forces.

Q: Can Countersunk External Locking Washers endure harsh environments?.

A: Absolutely. Made from A2 Stainless Steel, these washers exhibit excellent corrosion resistance, making them suitable for a variety of environments, whether indoor or outdoor and can withstand exposure to various corrosive elements.

Q: What type of screws work best with Countersunk External Locking Washers?.

A: Countersunk screws, which have a conical under-head area, pair best with these washers. The washer can sit within this countersunk area, creating a flush, smooth surface, and aiding in the preservation of the assembly's aesthetics and integrity.

Q: How can I ascertain the correct size of Countersunk External Locking Washer for my project?.

A: The ideal washer size corresponds with the diameter of your countersunk screw or bolt. Accu offers a wide range of sizes from M2 to M20, ensuring you'll find the perfect fit for your fastening needs.

Q: Is there a minimum order quantity for Countersunk External Locking Washers at Accu?.

A: Accu appreciates the diversity in its customer's needs, thus offering flexibility in order quantities. Whether you need a single washer for a prototype or a large quantity for a production run, we are here to meet your needs.

Bespoke Countersunk External Locking Washers Manufacture.

High precision, bespoke manufacture of Countersunk External Locking Washers to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.

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