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NAS 523 fastener code

NAS 523 fastener code

NAS 523 fastener code

(OP)
Could anyone tell me what a square around the NW (upper right) digits of the fastener quadrant indicates ?

Cheers

RE: NAS 523 fastener code

(OP)
Sorry, NW (upper left)quadrant.

RE: NAS 523 fastener code

Dunny,

I just read through the standard, and saw nothing regarding a square in the upper left (northwest) quad. I have seen (on occasion) a square in the upper right (northeast) quad to separate the -(dash) no (dia) from the mfr head location. The only literature (not the standard - fr another book) I found regarding this practice is that the square is to represend an "installation" fastener.

Wes C.
------------------------------
When they broke open molecules, they found they were only stuffed with atoms. But when they broke open atoms, they found them stuffed with explosions...

RE: NAS 523 fastener code

Boeing uses the box in the NW quadrant to indicate a fluid tight installation.  I'm not sure if that's standard throughout the industry or not.

SuperStress

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