Metric thread how deep to cut

[bob]

Draw tube external thread measures 50mm by 1.5 pitch. Need to make nut to fit. What size hole should I start with and how deep to cut? Thanks Bob

 

[Red James]

Hole should be 48.5 mm diameter (50 - 1.5), and depth should be all the way thru the nut.

 

[johnoder]

Depth is 0.694 X 1.5. Tool point radius max 0.0633 X 1.5

(per HTRAL #50)

 

[jz79]

formincharcount

 

[Gordon B. Clarke]

Draw tube external thread measures 50mm by 1.5 pitch. Need to make nut to fit. What size hole should I start with and how deep to cut? Thanks Bob

All you need to know and probably more.

 

[John Garner]

Do note that the fundamental shapes of the ISO Metric and Unified (aka ISO Inch) threadforms are identical, which allows the same rule-of-thumb for the diameter of the hole to be threaded to be used for both ISO Metric and Unified (ISO Inch) threadforms: "Tap Drill Diameter" = Major Diameter minus Pitch.

Perhaps obviously, dimensions and tolerances for ISO Metric screwthreads are expressed in millimeters while those for Unified (ISO Inch) screwthreads are expressed in inches . . . AND the Pitch of a Unified (ISO Inch) screwthread will need to be calculated as 1 / Number of Threads Per Inch.

 

[Gordon B. Clarke]

Do note that the fundamental shapes of the ISO Metric and Unified (aka ISO Inch) threadforms are identical, which allows the same rule-of-thumb for the diameter of the hole to be threaded to be used for both ISO Metric and Unified (ISO Inch) threadforms: "Tap Drill Diameter" = Major Diameter minus Pitch.

Perhaps obviously, dimensions and tolerances for ISO Metric screwthreads are expressed in millimeters while those for Unified (ISO Inch) screwthreads are expressed in inches . . . AND the Pitch of a Unified (ISO Inch) screwthread will need to be calculated as 1 / Number of Threads Per Inch.

And more to show what you mean.

http://f-m-s.dk/1.09.pdf

http://f-m-s.dk/THREAD PITCH DIAMETER TOLERANCE AREAS.pdf