AN Bolt Torque... Tension vs Shear for spar bolts

loopfuzz · #1 01-07-2010, 01:26 PM

2 questions here. The first is.. Should torque the spare bolts to the "shear" torque value?

2nd question.. I found a link to a torque chart http://forums.matronics.com/download...f21609d5dcbc14
best I can figure the ft/lb values on that are wrong. Those ft/lbs are actually inch pounds. correct? Anybody have nice PDF chart of good values ? My book with these values are down at the hangar.

Mel · #2 01-07-2010, 03:14 PM

There is no difference in torque for tension vs. shear. The shear torque you see in the tables is for "shear nuts". These nuts are thinner and therefore will not tolerate the same torque as full nuts. Even though the spar bolts are indeed in shear, they should be torqued to the full torque value.

loopfuzz · #3 01-07-2010, 03:26 PM

Hmm interesting. Thanks Mel. I didn't know that.

I also found this is previous posting regarding the torque values for NAS close tolerance bolts... Which helps me.

NAS1307-50 Close tolerance bolts are 7/16" in diameter. With AN365 nut they get torqued to 520-630 in-lbs.

NAS1304-50 close tolerance bolts are 1/4" in diameter. With AN365 nut they get torqued to 80-100 in-lbs.