3.2.2 Thread Runouts for ISO Metric Threads and Minimum Screw-In Depth
Thread outlets for ISO metric threads according to DIN 76 and minimum screw-in depth in blind hole thread
Minimum screw-in depth in ground hole thread
The calculation of the minimum screw-in depth for heavy-duty bolted connections is carried out in accordance with guideline VDI 2230, and as part of Prüfungsabschnitt 2, you must design a bolted joint yourself. However, since this is not a highly stressed and therefore less critical bolted joint, a rough determination of the minimum screw-in depth using the table below is sufficient:
ATTENTION: Values for e1 are now found in table 2 on page 9 of DIN 76!
Thread outlets for ISO metric threads according to DIN 76-1
Similar to the undercuts in the area of the fittings, the thread run-out or thread undercut is similar. This too must be manufactured in order to be able to cut a thread perfectly down to one paragraph. If this is not the case, for example, the nut that is screwed onto a threaded shank cannot sit directly on the heel. The dimensions of the metric thread outlets depending on the thread gradient and the standard thread can be found in the "DIN76-1". You can access it via the Perinorm portal (see 3.1 Access to standards).