Tornado Strike Serrated Lock Washer K73122340

The Serrated Lock Washer (part# K73122340) is a toothed washer used in the Tornado Strike’s brush head to stop a fastener working loose. It is a two-cent-looking part that prevents an expensive failure, which is the usual story with locking hardware.

Compatible Models for the Serrated Lock Washer

• Tornado Strike Cordless Upright Vacuum — Model TV190-W10-U

This is a Strike-only component: Tacony’s parts records list the Tornado Strike TV190-W10-U as the single machine that takes part# K73122340, so there is no cross-model substitution to worry about when you order it.

What the Serrated Lock Washer does

A brush head vibrates constantly — a motor spinning, a belt pulling, a roll hitting carpet seams and thresholds. Plain fasteners walk under that kind of cyclic load. The teeth on a serrated washer bite into both the fastener face and the surface beneath it, so backing off has to overcome the bite rather than just friction. It also spreads clamping load slightly, which matters when the surface underneath is a moulding rather than metal.

Signs the Serrated Lock Washer needs replacing

Serrated washers are single-use in practice: once the teeth have been flattened by a torqued fastener they will not bite properly again, so fit a new one whenever the joint is disturbed. Replace on sight if the teeth are visibly rolled over or polished flat, if the washer is cracked or distorted into a dish, or if there is rust. A fastener found loose at service should be refitted with a new washer rather than simply nipped up.

Fitting the Serrated Lock Washer

The washer goes between the fastener head and the part being clamped, teeth against the surfaces — not under a plain washer, which defeats it entirely. Clean both faces first; grit trapped under the teeth stops them seating. Tighten to firm and no further, especially into plastic, and do not be tempted to reuse the old washer because it looks fine — the teeth are the part that matters and they are already spent.

Twin City Vacuum has been selling and servicing Tornado equipment since 1956. You can browse the rest of the machine on our Tornado Strike parts pages, and the manufacturer publishes specifications at tornadovac.com.

Frequently Asked Questions

What does the Serrated Lock Washer do on the Tornado Strike?

Its teeth bite into the fastener and the surface beneath it so the joint resists working loose under the constant vibration inside the brush head.

How do I know if my Serrated Lock Washer needs replacing?

Fit a new one any time the joint is taken apart — the teeth flatten on first use and will not bite the same way again. Replace on sight if the teeth are rolled flat, the washer is dished or cracked, or there is rust.

What models is the Serrated Lock Washer (part# K73122340) compatible with?

The Tornado Strike TV190-W10-U cordless upright vacuum, and only that machine. Tacony’s parts records list no other model that takes part# K73122340.

How do I order the Serrated Lock Washer (part# K73122340) or get help?

The Serrated Lock Washer (part# K73122340) is a call-for-price item, so ring us on 763-535-0770 and we will quote it and check stock while you are on the line. Our staff at 5415 West Broadway, Crystal, MN 55428 has been servicing Tornado equipment since 1956 and can confirm it is the right part for your machine.

Questions? Call us at 763-535-0770 or visit us at 5415 West Broadway, Crystal, MN 55428.