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AL331-6-8 (Hi-Lite)

AL331-6-8 (Hi-Lite)

AL331-6-8 (Hi-Lite)

(OP)
How can you get the collar part number for AL331-6 Hi-lite? Can I use HL70-6 collar?

RE: AL331-6-8 (Hi-Lite)

C.R. …

I don't believe that 'AL331' is a valid Hi-Lite sequence part number. ALSO, I am completely unfamiliar with the 'AL' prefix on part numbers.

Please attach a copy of the 'AL331' specification-sheet You are referring-to.

NOTE1.
IF this is a valid LISI PN, the upper-RH corner of the spec sheet should show the fastener installed with a COLLAR... and in tiny print, recommended collar PNs... although that's NOT to-say those are the ONLY collars that could be installed.

NOTE2.
LISI Hi-Lite part numbers are 'HLTxxx-*'.. see... https://www.lisi-aerospace.com/en/product/hi-lok-a...

Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

RE: AL331-6-8 (Hi-Lite)

"AL" is "Aero-Lite" ... a copy of LISI/peerless Hi-Lite.

seems odd to want to mix fasteners and collars ? probably that's what they've got on hand. Compare the two specs. Even if "identical" you probably need "proper" engineering to approve the substitution.

another day in paradise, or is paradise one day closer ?

RE: AL331-6-8 (Hi-Lite)

This from the HOWMET Aerospace website (which I found by googling "AL331") ...

"Lightweight Threaded Pin
The Aero-Lite pin design features a tapered lead thread that closely matches the mating collar, allowing 1/3 through 1/2 pitch-under-grip performance due to enhanced full-form thread runout."

Mind you the site is very bad at identifying which collars go with which fastener. I couldn't find any collars !?

another day in paradise, or is paradise one day closer ?

RE: AL331-6-8 (Hi-Lite)

Rb… I learned something new today... Aero-Lite, hummmmm.

Looks like Howmet is licensed for the Hi-Lok family of fasteners... then developed the Aero-Lite and Very-Lite within the license.

IF this is the case then there is likely commonality between all pins and all collars... although there would be optimum combinations.

I found the Howmet website difficult... never did find any collar specs.

Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

RE: AL331-6-8 (Hi-Lite)

OK OK OK…

HL70 collars are sized to fit on the longer-thread HL shear pins. HL10 PSH Titanium pin is a classic example.

NOTE1
From HL spec sheets...
HL10-6 shear pin has a thread length [B*] = 0.325
HL70-6 has a counterbore + thread depth [L1*] = 0.280
The HL10-6 has ~0.052 longer thread than the HL70 which is allowance for stack-up variations within grip range.

From AL103 spec/drawing sheet for AL331-6 pin [very odd having a spec/drawing sheet number greatly different from the part number]...
AL331-6 shear pin has a thread length [T*] = 0.290... which is only 0.010 longer than the [L1*] for the HL70-6.
This is NOT a suitable match. A lower height collar or nut is required... in-keeping with the Aero-Lite theme... possibly a Hi-Lite aluminum or Ti collar for a shear pin may/may-not work

Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

RE: AL331-6-8 (Hi-Lite)

we both had trouble reading the HOWMET spec for these fasteners ... nothing indicated which collar went with which screw.

You "could" use a standard MS/NAS nut ... this is something we permit at times.

another day in paradise, or is paradise one day closer ?

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