Tornado Lock Washer 1/4″ Heavy Series 01574

This is the 1/4 inch heavy series split lock washer — the one that pairs with the 1/4-20 fasteners that make up most of the hardware on this machine. Part number 01574 is the genuine OEM part, and it is one of the most widely shared fasteners in the entire range. It also fits the Tornado 98166 20″ Marathon 800 carpet extractor (8 Gallon, 115V). It also fits the Tornado 98167 20″ Marathon 800 carpet extractor (8 Gallon, 230V).

Compatible Models for the Lock Washer 1/4″ Heavy Series

This part is shared across a wide run of machines. On the Marathon 1200 family it is fitted to:

• Tornado 98168 12 Gallon Self Contained Carpet Extractor
• Tornado 98168 20″ Marathon 1200 Carpet Extractor (12 Gallon, 115V) — all series
• Tornado 98169 20″ Marathon 1200 Carpet Extractor (12 Gallon, 230V)
• Fits many other machines — call 763-535-0770 and we will confirm fitment for your machine.
• Tornado 98166 20″ Marathon 800 Carpet Extractor (8 Gallon, 115V)
• Tornado 98167 20″ Marathon 800 (8 Gallon, 230V)

Because 1/4-20 is the dominant thread here, this is the lock washer you will need most often, and it is also the one most likely to be reused out of habit. Do not. A lock washer works by staying sprung; one that has been torqued flat has spent its spring, and refitting it is indistinguishable from fitting a plain washer. It is the cheapest insurance on the machine and the commonest false economy.

The quick check is the step. A fresh split washer has a visible offset where the two ends of the ring sit at different heights. Crushed flat, there is no step. Heavy series means a thicker section than a standard 1/4 inch lock washer, so if a replacement looks noticeably thinner than what you removed, it is the wrong part.

Corrosion is the other reason to swap one. Detergent reaches most of this chassis, and a washer that has pitted has lost section — and section is exactly what stores the spring.

Stack order: lock washer against the nut or the head, plain washer between it and the material. Reversed, the lock washer bites the material instead of the fastener and does nothing.

Order a box rather than a few. At this size and on this machine, they are consumed by every repair, and a job held up overnight for a lock washer is a poor trade.

Browse every assembly for this machine on the Tornado 98168 Marathon 1200 parts hub, and see the manufacturer’s range at tornadovac.com.

Frequently Asked Questions

What machines does the lock washer 01574 fit?

It is fitted to the Tornado 98168 12 Gallon Self Contained carpet extractor and the 98168 20″ Marathon 1200 in all series, and it is shared across many other machines. Call 763-535-0770 with your model and serial number and we will confirm fitment before you order It also fits the Tornado 98167 Marathon 800 (8 Gallon, 230V).

Why can I not reuse a lock washer?

Because it works by staying sprung. One that has been torqued flat has spent its spring, and refitting it is indistinguishable from fitting a plain washer. Check the step where the two ends of the ring sit at different heights — crushed flat, there is no step.

How do I know I have the heavy series and not a standard one?

By section thickness. Heavy series is thicker than a standard 1/4 inch lock washer of the same diameter, so if a replacement looks noticeably thinner than what you removed, it is the wrong part and will give less locking force than the joint was designed around.

How do I order the Lock Washer 1/4″ Heavy Series (part# 01574) or get help?

You can add the Lock Washer 1/4″ Heavy Series (part# 01574) directly to your cart on this page, or call us at 763-535-0770. Our staff at 5415 West Broadway, Crystal, MN 55428 has been servicing Tornado equipment since 1956 and can help confirm the right part for your machine.

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