Here is one of my old posts for reduced head screws I used
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Old 01-07-2014, 09:46 AM
fixnflyguy fixnflyguy is online now
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,265
Default Titanium hardware
I have used the Boeing fastener codes/sources for all my Titanium hardware. Again, being in the industry helps, and for the most part, an RV uses 2 basic types, one being the hex head bolt, and the flush machine screw. I simplified the flush screw variations throughout the entire plane, and utilize all #8 screws/nutplates for fuel tank attach flanges,fairings,wheel pants,floor panels,ect.. But I used what is known as a "reduced head" 100 degree fastener. These screws have a smaller head that is equivelent to a #6 screw, but have a 5/32" shank diameter. The hex head bolts are a direct replacement for the AN3&4 diameters. The basic numbers are:
Hex head bolt : BACB30NR (diameter in 16ths)K(length in 16ths), so a BACB30NR3K3is a 3/16 diameter, 3/16 grip length Titanium bolt with aluminum coating (the K designation).
Flush head: BACB30VF2K3 is a reduced head,100 degree CSK #8 machine screw, 3/16 grip. The (2) diameter is for a 5/32" diameter, however a (3) would be 3/16", so dont let it throw you off. I know this is all a little confusing, but Google the numbers and you will probably find vendors/data..but I would start with the originator of this thread.
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Bill E.
RV-4/N76WE
8A7 / Advance NC