Tornado Screw #10-24 x 3/4 in. Phillips Flat Head Stainless 18339

Genuine Tornado OEM machine screw, #10-24 x 3/4 in., Phillips flat head, stainless steel (part# 18339). This is a structural fastener rather than a trim screw: on the Marathon 800 and Marathon 1200 extractors it is one of the screws that holds the brush plate to the brush housing, and it appears across a wide range of Tornado extractors, burnishers and Floorkeeper automatic scrubbers. Because every machine it fits is a Tornado, ordering by this number is the reliable way to get the right one.

The flat head is the detail that matters. It seats flush in a countersunk hole so nothing protrudes into the brush path, and the stainless material is there because this fastener lives in a wet, detergent-laden environment where a plated steel screw would rust and seize. Substituting a hardware-store screw of the same thread is a common shortcut and a poor one — a proud head catches the brush, and a non-stainless screw will usually be rounded off or frozen the next time the plate has to come off.

Where this screw is used on the machine

On the brush assembly, three of these screws work with three jack nuts (part# X9870) on the back side of the brush housing, while six screws of a different number secure the front side. If you are taking a brush plate off for the first time, count what comes out and keep the back-side and front-side fasteners separate — they are not interchangeable, and mixing them is what leads to a plate that will not pull up square.

When to replace it

Replace any of these screws whose head is rounded, whose threads are galled, or that shows rust staining or pitting. They are inexpensive enough that putting a tired fastener back into a structural joint is never worth the labour of going in a second time. If a screw spins without tightening, the jack nut behind it has usually failed rather than the screw, so check both.

Compatible Models

• Tornado 98166 20″ Marathon 800 (8 Gallon, 115V)
• Tornado 98168 20″ Marathon 1200 (12 Gallon, 115V)
• Tornado 98190 22″ Marathon 2000 (20 Gallon)
• Tornado 98499 20″ Clean-Air Battery Glazer 2500B
• Tornado 99105A 20″ EZ BD Floorkeeper (two 12-volt batteries)
• Tornado 99105B 20″ EZ BD Floorkeeper (four 6-volt batteries)
• Tornado 99125A 20″ EZ Floorkeeper (two 12-volt batteries)
• Tornado 99125B 20″ EZ Floorkeeper (four 6-volt batteries)
• Tornado 99130 24″ EZ Floorkeeper
• Tornado 99307 26″ Mid-Range Floorkeeper Automatic
• Tornado 99407 33″ Mid-Range Floorkeeper Automatic

Not sure if this fits your machine? Call us at 763-535-0770 with your model and serial number and we will confirm compatibility before you order.

Twin City Vacuum has been selling and servicing Tornado equipment since 1956. Browse the rest of the Tornado 98166 brush assembly parts, or see the full range at tornadovac.com.

Frequently Asked Questions

What does the #10-24 x 3/4 in. screw (part# 18339) do on a Tornado extractor?

It is a structural fastener. On the Marathon 800 and Marathon 1200 brush assemblies it is one of three screws that hold the brush plate to the brush housing, working against jack nuts on the back side of the housing. The flat head seats flush so nothing stands proud of the brush path.

How do I know if the screw (part# 18339) needs replacing?

Replace it if the head is rounded, the threads are galled, or there is rust staining or pitting. If it spins without tightening, the jack nut behind it (part# X9870) has usually stripped rather than the screw itself, so inspect both before reassembly.

What models is the #10-24 x 3/4 in. screw (part# 18339) compatible with?

It fits the Tornado 98166 Marathon 800, 98168 Marathon 1200, 98190 Marathon 2000, 98499 Clean-Air Battery Glazer 2500B, 99105A and 99105B EZ BD Floorkeeper, 99125A and 99125B EZ Floorkeeper, 99130 EZ Floorkeeper, and the 99307 and 99407 Mid-Range Floorkeeper Automatic scrubbers.

How do I order the #10-24 x 3/4 in. screw (part# 18339) or get help?

You can add the #10-24 x 3/4 in. screw (part# 18339) 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.