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TOPIC: Cracked cover plate

Cracked cover plate 2 days 13 hours ago #1816

  • STEVE ELLS
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Hi Andrew;
The part number of the bolt is NAS464P5LA30 or 33. This bolt has a tensile strength of 160 -180 kpsi
According to the Genuine Aircraft Hardware book (your mechanic should have one--go to www.gen-aircraft-hardware.com to get one) this bolt is a 5/16 inch diameter close tolerance bolt with a diameter of .3117. The P indicates its plated (Cad II); the L indicates a slightly longer thread length; the A indicates there's no cotter pin hole.
The 30 (and 33) indicates length in 1/16s of an inch increments. So the grip (distance measured from the underside of the head to the full cylindrical part of the shank) of the 30 is 30 16s of inch or 1 and 7/8 inches. The 33 bolt is 2 and 1/16th of an inch grip.
I did not find these bolts at a better cost than you did.
But it appears as if NAS62 and NAS 66 are also close tolerance bolts with 160-180 kpsi tensile strength and are Cad II plated.
The NAS 62 series are what's called medium thread length while the NAS 66 are called long thread length.
It appears as though a NAS 6205-30 or -33; or a NAS 6205-30 or 33 would be an equivalent bolt. It will depend entirely whether your mechanic approves the installation of this alternate part number bolt. Both the NAS6605-30 and -33 and the NAS6205-30 and -33 are available for a little over $2 from: catalog.monroeaerospace.com/item/all-cat...bolts-1/nas6205-30-1.
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Cracked cover plate 1 week 1 day ago #1807

I’m needing to repair or replace the gear fairing cover plate. I am wondering will I need to buy new bolts after removal? They are nas bolts and Cessna wants $50 a piece for them. This is on a 1978 182Q.
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