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Best Prop Wrench Money Can Buy - 4th of July Sale

AceAviationSupply.com

AceAviationSupply.com

Purveyor of Exceptional Aircraft Parts.
Ambassador
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Happy 4th of July!

To launch our new wrench and celebrate the holiday we are offering free shipping on the best 3/4" prop wrench money can buy! Order your wrench before this coming Monday and freight is free of charge. Over a year in development, this prop wrench has undergone many upgrades and is superior to what is currently on the market. As a matter of fact, during testing on some factory Hartzell hardware in our test fixture, the wrench was strong enough to strip the threads from the Hartzell stud/nut without the wrench failing or opening up. I can say this wrench is a fine piece of hardware and I am proud to bring it to the market.

A few things to note about this wrench:

CNC machined from US made 17-4PH H900

Scannable QR Code for Torque Calculator (no thought necessary!)

Two flats per ratchet on the speed end of the wrench

Radiused edges of the wrench and the mouth making it virtually impossible to gouge your prop hub!

aceaviationsupply.com

Ace Prop Wrench

Ace Prop Wrench Torque Calculator (calibrated for the Ace wrench.) ✈️ Ace Prop Wrench — Built for Precision, Engineered for Reliability. Purpose-built for builders and mechanics who treat their aircraft like it matters. Every Ace Prop Wrench is CNC-machined to ±0.001″, with all perimeter edges...
aceaviationsupply.com aceaviationsupply.com

I hope you will enjoy your new wrench as much as we have enjoyed making it the best wrench money can buy.

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Thanks Paul! While this year we aren’t able to make it to Osh we are hopeful to show them off in the future. The feedback we have gotten from people who have used them so far is that they have the finish of jewelry and are tough as nails.
 
Very similar to Allan Nimmo’s Ultimate Propeller Wrench (AntiSplatAero) , which has been available for many years. Allan’s is available in 3/4” and 5/8”.

antisplataero.com

Ultimate Propeller Wrench | Precision Tool for RV Aircraft | AntiSplatAero

Enhance propeller maintenance with our Ultimate Propeller Wrench. Crafted from 4340 heat-treated steel, available in 5/8″ or 3/4″ sizes for RV aircraft.
antisplataero.com antisplataero.com
and available from ACS, but costs more:
www.aircraftspruce.com

Anti-Splat Aero Ultimate Propeller Wrench | Aircraft Spruce ®

Anti-Splat Aero Ultimate Propeller Wrench Unlike anything on the market at any price. This tool makes short work of R&R on your constant speed propeller.
www.aircraftspruce.com www.aircraftspruce.com

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Thanks for replying, RV8JD!

I’m glad you brought that wrench up. After owning and using many of the previously available prop wrenches on the market (including that one), we eventually decided to build what we felt was a genuinely better mousetrap.

The wrench you mentioned has sharp edges and looser tolerances than what CNC machining can provide. The Ace Prop Wrench is CNC‑machined to 0.001” precision, with radius edges to prevent marring or gouging the prop hub during use.

We also designed a slim ratchet end that delivers two ratchet actions per cycle, compared to the single‑action design of the older wrenches.

The Ace Prop Wrench is machined from a single billet of stainless steel — no coatings to chip, flake, or wear off — and every wrench includes laser‑engraved instructions showing exactly how to use it with any torque wrench.

Thanks again for mentioning it!

— Tim Jennings
 
mstrauss said:
Sorry if this is a dumb question, but why is something like this needed instead of a standard crows foot?
Click to expand...
On a Hartzell constant‑speed prop, the space between the hub and the spinner backplate is extremely limited — that’s where the prop studs and captive nuts live. Any time you’re installing or removing the prop (prop or engine overhaul, nose‑seal replacement, alternator belt replacement, etc.), that tight geometry makes the job slow and awkward. The Ace Prop Wrench was built specifically to solve those problems by increasing speed, accuracy, and control while reducing the chance of damage.

During installation, the first challenge is getting each prop bolt threaded a few turns while supporting the loose prop. After those initial turns, each bolt bottoms out and you have to rotate the hardware relative to each other as they bottom out a few times as the prop hub slides into place on the crank. The weight of the prop makes spinning the nuts by hand nearly impossible. That’s where the wrench’s two‑flats‑per‑ratchet‑mode comes in — you can rapidly spin the nuts with the tool using just your hand. This function helps during prop installation and removal.

Next comes proper torque. Because of the tight space, maneuvering a torque wrench with a traditional crow’s foot is difficult or impossible. You can give the bolts the classic German torque (good‑n‑tite) with a normal open‑end wrench, but if you want to torque to manufacturer spec, you need a purpose‑built tool. Several companies make these, but all except the Ace Prop Wrench require manual torque‑setting math due to the added tool length — unless you operate the tool perfectly perpendicular.

The Ace Prop Wrench eliminates that hassle. It’s the most innovative and best value in the space thanks to its radius edges, stainless construction, optimized geometry, and laser‑etched directions via a scannable QR code that takes you straight to the torque calculator. The markings on the wrench also show which way the ratchet ends operates.

Where did this innovation come from? From me removing my own prop multiple times to replace the nose seal, swap the alternator belt, and eventually overhaul the prop — all while using the old‑style wrenches available at the time. I bought several versions, and every one felt lacking. I knew something better could exist, so I spent the next year designing, machining, and testing prototypes until we arrived at the tool we’re proud to bring to market today. As always, we stand on the shoulders of those who came before — just as the old wrenches improved on what they replaced, this one pushes the evolution forward.

- Tim Jennings
 
I don’t have my prop yet, but do you know if the Hartzell props with 7/16” bolts use a 3/4” hex or are they a different size?
 
Is the drive hole on this tool 3/8" or 1/2"? I have two of these on order but just wondered about this. All my torque quenches are either 1/4 or 3/8 drive. I hope I don't need an adapter.
 
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