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JayCarp (Mechanical)
5 Nov 07 13:24
I am in industry and am proposing use of AN fittings
in one of our applications. My question is what is the
maximum working pressure for 7075 " W " versus 2024
" D " material. The particular fitting size is - 4 ,
1 / 4 "
rb1957 (Aerospace)
5 Nov 07 14:21
"W" ??? ... isn't W a very reduced strength condition for forming puropses ? If i'm right, nobody would use W material (without heat-treating it to say T6 or T73).
also what sort of AN fitting ? ... an AN-4 is a bolt; we'll need to know which AN fitting you're considering.
monkeydog (Aerospace)
5 Nov 07 14:30
AN960 should work fine.
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rb1957 (Aerospace)
5 Nov 07 17:43
if you wanted a washer
ewh (Aerospace)
5 Nov 07 17:56
wktaylor (Aeronautics)
5 Nov 07 20:55
Jaycarp...
You have to identify the fitting(s) You want to used based on configuration [elbows, tees, sizes, etc]... then trace it back to the procurement spec for operating limits. Or have a company document that specifices working pressure loads... and any other loads present [bending, shear, vibration, abuse, etc]
NOTE: W = 7075-T73 die forging, D = 2014-T6 die forging
In MANY instances, the D material parts are hard to find! The D material is not readily avaialble due to minimal use. The W material is slightly stronger/tougher and has better corrosion & SCC resistance; and is a very commonly forged material. Regards, Wil Taylor
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MikeHalloran (Mechanical)
5 Nov 07 21:11
In 'industry', where hammers are primary maintenance tools, I'd be inclined to use steel 'AN' fittings, not aluminum.
Mike Halloran
Pembroke Pines, FL, USA
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