Pilottonny
Well Known Member
Forgive a ?metric-addict? , his ignorance, but I just do not get all this AN, NAS, MS, etc. bolt-stuff!
I need to order 4 bolts, to bolt my prop governor to the back of the engine. So, I started investigating AN-sizes, measured the grip I need, etc. and came up with: AN5H-12A (5/16 dia. 1,1/4 length, drilled head). When the bolts, I ordered from ACS, arrived they would not fit the hole in the back of the engine, because????.. they were fine thread and the threaded hole in the engine is course thread. So I re-ordered the same bolt with ?course thread?. Guess what? After several emails and a telephone call, ACS now tell me they do not sell such a bolt (the? C? after the N-number on their website, turns out to designate ? Stainless steel? not ?Course?, how logical is that?)
They now tell me that they need a ?NAS? or ?MS? number for a bolt that will fit the engine???.
So, I searched the forums, Googeled ?NAS?, etc., but so far: thousands of NAS-Codes, without any logical explanation of dia. and length.
Is there anybody out there that can help me determine what bolt I need?
Thanks in advance for any help.
Regards, Tonny.
I need to order 4 bolts, to bolt my prop governor to the back of the engine. So, I started investigating AN-sizes, measured the grip I need, etc. and came up with: AN5H-12A (5/16 dia. 1,1/4 length, drilled head). When the bolts, I ordered from ACS, arrived they would not fit the hole in the back of the engine, because????.. they were fine thread and the threaded hole in the engine is course thread. So I re-ordered the same bolt with ?course thread?. Guess what? After several emails and a telephone call, ACS now tell me they do not sell such a bolt (the? C? after the N-number on their website, turns out to designate ? Stainless steel? not ?Course?, how logical is that?)
They now tell me that they need a ?NAS? or ?MS? number for a bolt that will fit the engine???.
So, I searched the forums, Googeled ?NAS?, etc., but so far: thousands of NAS-Codes, without any logical explanation of dia. and length.
Is there anybody out there that can help me determine what bolt I need?
Thanks in advance for any help.
Regards, Tonny.