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Screw sizes

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arwel.pritchard(at)powerc
Guest

Posted: Tue Dec 28, 2021 4:07 am Post subject: Screw sizes

Good afternoon everyone,



Could someone please clarify what size are the screws that hold the 

engine cowlings on, hold the wheel spats on or hold the inspection 

panels on the wing underside?



Looking at the manual, I think they are 3/16" but am not sure what type 

of thread they are.



I need to replace some of mine as the heads are getting slightly worn.

Thank you

Arwel

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clivesutton

Joined: 23 Jan 2013
Posts: 187
Location: KENILWORTH

Posted: Tue Dec 28, 2021 5:33 am Post subject: Re: Screw sizes

Hello Arwel,



The cowl screws are usually countersunk with a Tinnerman washer, the inspection hatch screws are dome-headed and the spats are also cross-head screws - but i don't recall the type or length.  They are all 3/16 UNF from memory.



But the absolute best way to identify any part on your Europa, is to go to the appropriate section in the Europa build manual and there you will find the description and part numbers listed for e.g. the fasteners.  You will need to register (once) to view all the manuals and modification listings.  See:-



https://www.europa-aircraft.co.uk/support.html#register



And for buying bits from Europa, the email and contact number listed below, should be used now:



enquiries(at)europa-aircraft.co.uk   or call +44 (0)1603 542545



Hope it helps . . .

Clive S

G-YETI

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budyerly@msn.com

Joined: 05 Oct 2019
Posts: 286
Location: Florida USA

Posted: Tue Dec 28, 2021 8:22 am Post subject: Re: Screw sizes

Europa uses AN screws and bolts for the most part except in areas where the particular engine fitting or mount is either Metric or SAE.  It's important to get knowledgeable on hardware and have spares.



Counter sunk screws differ.  Most hardware store are 90 degree so they protrude and fit poorly causing cracks eventually.  AN hardware countersunk is 118 degrees for a flatter finish and it fits the Tinnerman washer precisely.

Note: Buy a 118 degree Permagrit countersink for use on the aircraft.  If you are a second hand owner, and are clueless of how the builder built the aircraft due to poor documentation, you only have the build manual to go by, so reading and study is essential.



For your Europa supplied screws they are (#10 which is 3/16 inch and is known as 10-32).  I use AN507 which is also known as MS24693 MACHINE SCREWS (AN507 in stainless steel).  I use 1/2 for around the sides (MS24693-C272), 5/8 for the top cowl circumference, and down the side side of the lower cowl and 3/4 to 1 inch for the very bottom of the lower cowl depending on your particular nutplate installation.  Available at Aircraft Spruce and other aircraft supply houses.



Make a list.  Everything that goes on or off will eventually need to be replaced or wear out.  My method is attached for logging my expendables.  As for my screw/bolt/nut list, I have trays full of every screw I have used during the build of the aircraft.  I make sure I have a few spares of all the cowl screws, wheel pant, and access panels I use on my aircraft in a tool bag.  My website has my tool bag contents in the techniques section and many are on the Europa Club Website.



Best Regards,

Bud Yerly

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