screw/bolts into tapped holes

WITT55 · Jun 17, 2003

I was wondering if anyone has any information/codes on using tapped bolts for structural/ building applications. I have talked with AISC and they are really no help. I have a european client and they use this type of fastener all of the time. I know that it is used in many other industries in the U.S. also but I can't seem to find any info. Also if you have data/references for the tapped screw/bolt allowable loads.

Thank You

RockEngineer · Jun 25, 2003

When you are bolting into a tapped hole the fastener is defined as a cap screw rather than a bolt. Cap screws have slightly tighter controls and a few variations from typical bolts. This is probably why AISC doesn't get into it. I am not aware of any specifications written for tapping structural bolts. The closest thing I know of is the "Naval Ships Technical Manual Chapter 075- Fasteners" It is available on the web at

http://www.metalwebnews.org/fastners.pdf

Section 7.6 covers fasteners in tapped holes and has some tables of minimum depth of tapped holes. All the other documentation I have seen simply states that the depth of the tapped hole should be sufficient to develop the full strength of the fastener.

Good Luck

bridgebuster · Jul 2, 2003

RockEngineer

Thanks for the link. Most engineers probably don't realize the amount of excellent reference manuals available from the Navy and the Corps of Engineers.

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screw/bolts into tapped holes

WITT55

Structural

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RockEngineer

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bridgebuster

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