helicoil inserts helicoil inserts kross68 (Aerospace) (OP) 19 Feb 09 12:47 a print calls for NAS1130-04L20 helicoilhow do i determine the (x) diameter i.e. 1d 2d etc.this must be know prior to drill depth and tap drill diameter RE: helicoil inserts monkeydog (Aerospace) 19 Feb 09 13:42 Have you read note 10 fo NAS1130? RE: helicoil inserts kross68 (Aerospace) (OP) 19 Feb 09 14:50 i dont have that spec at this time and just discovered that it cost $80.00 to download RE: helicoil inserts monkeydog (Aerospace) 20 Feb 09 11:38 You're in deep yogurt if you don't have the specs to do your job. People on this site reference some free sites for MIL type of specs about once a week. A search on this site, or maybe they will see this post and give the site.