Rules for tapped holes 2 edge
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Posted by: laserbob ® 09/27/2004, 16:11:43 Author Profile Mail author Edit

Does anyone know where I can find the documented rules as to the minimum distance a tapped hole can be to the edge of a part?? Also hole to hole? I looked in the Machinery's Handbook #25 and can't seem to find it. Thanks, Bob

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Re: Rules for tapped holes 2 edge
Re: Rules for tapped holes 2 edge -- laserbob	Post Reply	Top of thread	Forum

Posted by: Cragyon ® Administrator 09/27/2004, 18:26:07 Author Profile Mail author Edit

This depends on when the tapped hole feature is produced, before or after the edge of the part is manufactured. In general, when designing for aluminum, I never get any closer than .040" to an edge with thread sizes #10 or smaller.  You might contact your manufacturing representaive or the individual whom will machine this and ask their opinion.

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Re: Rules for tapped holes 2 edge
Re: Re: Rules for tapped holes 2 edge -- Cragyon	Post Reply	Top of thread	Forum

Posted by: gumbo ® 09/27/2004, 20:46:31 Author Profile Mail author Edit

The minimum spacing between bolts is generally governed by wrench clearances.  The only published data I've seen on edge distance is in Allowable Stress Design by AISC which is for through holes only.  As a rule of thumb I never have the center of the hole closer than 1 bolt diameter from a free edge.

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Re: Rules for tapped holes 2 edge
Re: Re: Rules for tapped holes 2 edge -- gumbo	Post Reply	Top of thread	Forum

Posted by: Cragyon ® 09/28/2004, 07:01:58 Author Profile Mail author Edit

Check out the following link here on Engineers Edge /wrench_clearance.htm . Gumbo, when using a cap head screw, all one needs is some minimal distance from the edge of the screw head.

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