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  #1  
Old 01-09-2021, 01:29 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,724
Default Screws That You Can Reuse

People sometimes mention that the screw they are using wore out, usually at the Phillips socket. Here are a couple of stronger screws. The ones that come with the kit are no stronger than 125 ksi; these are 160 ksi. This is strong enough to maintain shape, and I routinely reuse them. The prices are at Aircraft Spruce.

Pan head:
NAS602-8P
$0.15 each
8-32 .531" long

Flat head:
NAS517-2-2
$0.18 each
8-32 .531" long

You can get other lengths and other diameters of each. On my RV-3B project, a number of applications can use shorter screws. That reduces wear on the screw and the nutplate while saving weight.

Dave
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  #2  
Old 01-09-2021, 08:29 PM
RV3Bob RV3Bob is offline
 
Join Date: Jan 2008
Location: Los Altos, Ca.
Posts: 58
Default

Another trick is to use. JIS tipped screwdrivers and bits. Fit AN screws like a glove
Heard about them on this website.

Flew Cub today. Perfect weather at KCVH.
Hoping to get first start of engine in my 3B this week
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  #3  
Old 01-09-2021, 08:50 PM
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emsvitil emsvitil is offline
 
Join Date: Oct 2019
Location: SoCal
Posts: 477
Default

Do they have them with a hex head?
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  #4  
Old 01-10-2021, 09:07 AM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,724
Default

Generally our AN bolts are adequate and the heads are sufficiently tough. If you want a hex-head screw, they are out there but I don't know the part numbers offhand.

Dave
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  #5  
Old 01-10-2021, 10:49 AM
HFS HFS is offline
 
Join Date: Aug 2009
Location: Lemoore, CA
Posts: 319
Default NAS1801 & NAS1802

Listed as:

Screw, Hex Head, Cruciform Recess, Full Thread, 160,000 PSI Tensile Minimum Alloy Steel and A286 Corrosion Resistant Steel.

HFS
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  #6  
Old 01-11-2021, 08:19 AM
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Snowflake Snowflake is offline
 
Join Date: Oct 2009
Location: Sidney, BC, Canada
Posts: 4,113
Default

Quote:
Originally Posted by emsvitil View Post
Do they have them with a hex head?
Do you mean hex head (socket drive), or hex drive (ie. allan key)?

FWIW, I tried using hex drive keys for my baggage panel, and almost had to drill one out. Due to the geometry of the pan head, the hex key had to be 2.5mm, which is quite small. When one of the screws was stiff in the hole (I didn't use boelube), the head stripped out. Unlike a phillips, the bit stayed in the hole rather than skittering off across the skin, but like a phillips, I couldn't remove it without an easy-out.

My next attempt at replacing the phillips screws will be with torx heads.
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  #7  
Old 01-11-2021, 08:25 AM
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rv8ch rv8ch is online now
 
Join Date: Feb 2005
Location: LSGY
Posts: 3,661
Default SS Torx screws

SS Torx is an option.

https://vansairforce.net/community/s...ead.php?t=7435
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  #8  
Old 01-11-2021, 08:34 AM
RV6_flyer's Avatar
RV6_flyer RV6_flyer is offline
 
Join Date: Jan 2005
Location: NC25
Posts: 3,630
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Been using the Phillips screws with very little issue. Yes they can be reused and can cam out. Most of the cam out issue is from BAD screwdrivers. IF you only use an ACR bit (ACR has ridges that holds the screw in place) one does not have the issues caused by the Sears or Craftsman phillips screw destroying screwdrivers.

We have EXPERIMENTAL aircraft but when one uses Aircraft Tools, there are less issues and problems that are common with automobiles.
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  #9  
Old 01-11-2021, 09:39 AM
bill.hutchison bill.hutchison is offline
 
Join Date: May 2020
Location: Northern VA
Posts: 155
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Quote:
Originally Posted by RV6_flyer View Post
Been using the Phillips screws with very little issue. Yes they can be reused and can cam out. Most of the cam out issue is from BAD screwdrivers. IF you only use an ACR bit (ACR has ridges that holds the screw in place) one does not have the issues caused by the Sears or Craftsman phillips screw destroying screwdrivers.

We have EXPERIMENTAL aircraft but when one uses Aircraft Tools, there are less issues and problems that are common with automobiles.
This concept of specialized Phillips screws and bits was new to me but I have learned that there are AN-type fasteners and I've got an inquiry into Van's about getting a few pocketfuls of replacements for exactly this need.

But the idea of an aircraft-tool-specific screwdriver and screwdriver-bit type is completely new to me and I need to hunt down a 101-level read on this.
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  #10  
Old 01-11-2021, 09:54 AM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 1,240
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Lookup Wera screwdrivers and bits. Best around and not expensive. Brown tools had the Wera bits. The handled drivers are available in lots of places. It isn’t about having aircraft tools as such. It’s the joy of having the right tool for the job. Cheap screwdrivers don’t fit the slots right. Good ones do that and have anti slip features too.
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