Screw #10-24 x 1-3/4 inch X9746

The Screw X9746 is the genuine Tacony OEM #10-24 x 1-3/4 inch black pan head machine screw used to fasten the harness hardware on Tornado and Powr-Flite backpack vacuums. Four are fitted per machine. Each one passes through the harness frame and body and is secured with a washer (X9747) and a nylon-insert lock nut (X8271) on the far side, so the three parts work as a set.

This is a machine screw running into a nut, not a self-tapping screw biting into plastic, and that distinction is why the exact length and thread matter. A shorter screw will not pick up enough thread in the nyloc collar to lock; a longer one bottoms out or protrudes into the operator’s back. Substituting hardware store hardware here is a false economy on a part that carries the entire weight of the machine on someone’s shoulders.

Compatible Models for the Screw X9746

This part is a genuine Tacony OEM component shared across multiple brands and models:

• Tornado: Pac-Vac 6 Aircomfort — Models 93012 and 93012B, Pac-Vac 10 Aircomfort — Models 93014 and 93014B
• Powr-Flite: Comfort Pro backpack vacuums BP6P, BP6S and BP10P

Not sure if this fits your machine? Call us at 763-535-0770 and we will confirm compatibility for you.

Fitting notes

The screw is reference 39 in the Tornado Pac-Vac parts book, sitting alongside the washer at 40 and the nyloc nut at 41. Fit the washer under the head, run the screw through the harness frame and body, and start the nut by hand until the thread meets the nylon collar before tightening. Hold the screw and turn the nut rather than the other way round, and stop as soon as the harness frame is clamped — over-torque here crushes the mounting boss. Replace all four along with their washers and nuts when a harness is being rebuilt. Twin City Vacuum has been selling and servicing Tornado and Powr-Flite equipment since 1956 and stocks the full Tacony hardware range. Browse the rest of the Tornado Pac-Vac Aircomfort parts range, or find machine specifications at tornadovac.com.

Frequently Asked Questions

What does the Screw (part# X9746) do on a Tacony backpack vacuum?

It is the #10-24 x 1-3/4 inch black pan head machine screw that fastens the harness hardware to the body. Four are used per machine, and each one pairs with a washer (X9747) and a nyloc nut (X8271) to clamp the harness frame in place. It is a machine screw into a nut, not a self-tapping screw into plastic, which is why the length and thread matter.

How do I know if my Screw needs replacing?

Replace any screw whose head is chewed out so a driver will not bite, whose thread is damaged or corroded, or that has been over-torqued and stretched. Because these four carry the harness load, a rounded head found at service time is worth replacing then rather than fighting it later with the machine on a customer site.

What models is the Screw (part# X9746) compatible with?

Tornado Pac-Vac 6 Aircomfort 93012 and 93012B, Tornado Pac-Vac 10 Aircomfort 93014 and 93014B, and Powr-Flite Comfort Pro backpack vacuums BP6P, BP6S and BP10P. It is one Tacony part number across all of them.

How many do I need?

Four per machine on the Pac-Vac harness. They are sold individually, so order the quantity you need – and if you are stripping the harness it is worth doing all four along with their washers and nyloc nuts, since the nylon collars in the nuts are single-use in practice.

How do I order the Screw (part# X9746) or get help?

You can add the Screw (part# X9746) 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 and Powr-Flite 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.