Question Cowl screws for CubCrafters cubs?

[Neal]

The cowl screws CubCrafters use seem quite soft, guessing they're aluminum. I have spares but does anyone know the source of these? There are 4 long ones and the rest are standard. I'd love to know where to get them should I decide to replace them more frequently if I had a bulk supply on hand.

 

[Cactus Charlie]

Stainless and available from Aircraft Spruce. I don't have the size or part number at home. Measure the ones you have.

Don't use a fast electric driver on stainless screws that use captive steel locknuts. The screws may gall. The grip of the locknuts is very variable. A tiny application of anti-seize may stop the tight ones from galling the screws.

I have spare screws and washers in case I drop one in a hangar floor crack. None damaged.

edit to add: CubCrafters sells a screw kit and includes the individual part numbers -

Misc Hardware & Screw Kit for CC11-100, CC11-160, EX2, EX3

store.cubcrafters.com

and

MS24693 Machine Screws (AN507) | Aircraft Spruce ®

MS24693 Machine Screws (AN507) These non-structural screws have a flat countersunk head, 100deg cross recessed head.

www.aircraftspruce.com

 

[Neal]

I only use the manual screwdriver, no electric tools.

 

[Cactus Charlie]

Extract from my Spruce orders file (confirm before ordering) -

PN Description Quantity Price Notes

AN507C632R8 SS MACHINE SCREW MS24693C28 25 0.1 6-32 1/2 inch for cowling etc.
AN507C632R10 SS MACHINE SCREW MS24693C29 25 0.08 6-32 5/8 inch for cowling etc.

 

[Neal]

I started the condition inspection process today and almost stripped one of the spinner screws trying to get it out. Would you happen to know the info to order spares of that size?

I learned from a fellow aircraft owner putting anti-seize on screws like this can help prevent this. Any opinions?

 

[Cactus Charlie]

I have one spinner nut plate that is tight so that screw always gets a little anti-seize.

Are you using the right screwdriver? I think these screw are #3 Phillips head.

My note in the Hartzell manual include:

 

[Cactus Charlie]

Probably -

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Stainless Steel​

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MS24693-C272​

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10-32​

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1/2​

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$0.21​

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but I don't have any record of having ordered any.

 

[Neal]

I tried a #3 phillips and it didn't fit well so stayed with #2. Will reinstall with anti-seize. Found the above referenced parts at the site below:

Aircraft Parts Supplier | Shop Aircraft Parts, Engines & Supplies - Air Power Inc.

Shop top-quality aircraft parts, engines and supplies at Air Power Inc. - your trusted online aviation source. Experience unmatched service and reliability.

www.airpowerinc.com

 

[Cactus Charlie]

Buy a better screwdriver. A #2 bit will damage #3 screws.

 

[Neal]

I have an assortment of bits, I'll check again to see what fits better.

B-3867-272 SCREW, 10-32 DEGREE HEAD, CRES

B-3867-272 SCREW, 10-32 DEGREE HEAD, CRES

www.airpowerinc.com