NAS 1304-30 and NAS 1306-30
These are close tolerance bolts. You need 4 of the 1304 and 16 of the 1306.
Ken
...AN3 bolts.
Examine all of the close tolerance bolts carefully. In some cases the holes were re-worked at Vans and the spars shipped with 0.010 oversize bolts.
Some of the NAS1304-30 oversize bolts were even custom made by Vans and have a different head marking. My wing came with one of these "special" oversize bolts.
Check the diameter of each bolt after you remove them.
Gill,
The standard for first oversize is +.015
Did Van's have some special ones produced?
If they did, I would suppose they would be very expensive!![]()