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Tapped Hole Distance

Tapped Hole Distance

Tapped Hole Distance

(OP)
I was wondering if there is a rule of thumb for the distance a tapped hole should be from an open end of a part. I want to use a 3/8" tapped hole but I am concerned about the distance between the thread and end of the part. Due to constraints I can only have the hole positioned 1/4" from the end of the part. Will this be enough or should I try to position it further away?

RE: Tapped Hole Distance

Centerline of tapped hole to part edge:

(Nut flat width-bolt Ø)/2 x 1.5 + bolt Ø/2

Your example: (.5625-.375)/2 x 1.5 + .375/2= .328"

RE: Tapped Hole Distance

Distance from the end to bolt hole should be two or three mm minimum + half the across corner of the bolt head.

RE: Tapped Hole Distance

Centerline of tapped hole to part edge:

(Nut flat width-bolt Ø)/2 x 1.5 + bolt Ø/2

Your example: (.5625-.375)/2 x 1.5 + .375/2= .328"


Mandrake, is this generally for all steels, or would this apply to aluminum also?

Flores

RE: Tapped Hole Distance

smdadman,
The rule of thumb in my fine equation of course is the x1.5 factor. This, roughly, is the ratio of tensile strength of a typical hex nut to typical low carbon steel. You would have to adjust this value depending on your fastener material/grade or tapped material tensile strength.

RE: Tapped Hole Distance

(OP)
Thanks for the help. This is exactly what I was looking for.

Later,
Dennis

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