Screw, 1/4-20 x 4 Hex Head Cap ZP 17645

The Screw, 1/4-20 x 4 Hex Head Cap ZP (part# 17645) is a genuine OEM replacement part fitted across both the Tornado and the Powr-Flite self-contained extractor ranges — 4 model records in the manufacturer’s own parts data. It is the long zinc-plated hex head cap screw that pulls the tank assembly together through its spacers — a 1/4-20 thread in a 4 inch length, which is what lets it reach through the stack.

Also known as the Screw, 1/4-20 x 4 Hex Head Cap ZP.

Compatible Models for the Screw, 1/4-20 x 4 Hex Head Cap ZP

• Tornado 20 in. Marathon 1200, 12 gallon 115V — Model 98168
• Tornado Marathon SE 900 self-contained carpet extractor — Model 98170
• Tornado 22 in. Marathon 2000, 20 gallon — Model 98190
• Powr-Flite Prowler PFX900S / PFX 900S-T — the same machine under the Powr-Flite name

Symptoms that point at this part

These are replaced because they are lost, stripped or seized rather than because they wear. A stripped head or a rounded hex is the usual reason; so is a screw that has been cross-threaded into its boss and will no longer pull the joint tight. Because they pass through plastic spacers, they are also frequently mislaid during a tank strip-down and discovered missing at reassembly. Zinc plating gives reasonable corrosion resistance but solution will eventually dull it, and a screw that has rusted into its spacer should be replaced rather than forced.

Fitting notes

Fit the spacers in the same order they came out and tighten evenly; over-torquing a 1/4-20 into a plastic boss will strip it.

Twin City Vacuum has been selling and servicing commercial floor equipment since 1956, and we keep parts for these extractors on the shelf in Crystal, Minnesota. You can see where this part sits on the factory drawing on the Tornado 98170 tank parts page, and the manufacturer publishes its own specifications at tornadovac.com.

Frequently Asked Questions

What does the Screw, 1/4-20 x 4 Hex Head Cap ZP do?

It is the long zinc-plated hex head cap screw that pulls the tank assembly together through its spacers – a 1/4-20 thread in a 4 inch length, which is what lets it reach through the stack.

How do I know if my Screw, 1/4-20 x 4 Hex Head Cap ZP needs replacing?

These are replaced because they are lost, stripped or seized rather than because they wear. A stripped head or a rounded hex is the usual reason; so is a screw that has been cross-threaded into its boss and will no longer pull the joint tight. Because they pass through plastic spacers, they are also frequently mislaid during a tank strip-down and discovered missing at reassembly. Zinc plating gives reasonable corrosion resistance but solution will eventually dull it, and a screw that has rusted into its spacer should be replaced rather than forced.

What models is the Screw, 1/4-20 x 4 Hex Head Cap ZP (part# 17645) compatible with?

It is a shared part. The manufacturer lists it on 4 model records across both the Tornado and the Powr-Flite ranges, including the Tornado Marathon SE 900 (Model 98170) and the Powr-Flite Prowler PFX900S, which are the same machine under two brand names. The full list is in the Compatible Models section on this page. If your machine is not listed, call 763-535-0770 with the model and serial number and we will check it.

How do I order the Screw, 1/4-20 x 4 Hex Head Cap ZP (part# 17645) or get help?

You can add the Screw, 1/4-20 x 4 Hex Head Cap ZP (part# 17645) 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 commercial floor 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.