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3-Newcomer
May 28, 2026
Question

ISO 15065:2005 countersink outer diameter (Dc) not auto-populated for ISO hole standard

  • May 28, 2026
  • 1 reply
  • 15 views

Problem: When creating a countersink hole using the ISO standard (e.g. M2x0.4, Clearance, Close Fit), the outer diameter field is left blank (Ø 0.00) and requires manual entry.

Impact: Every time a countersink hole is created with the ISO standard, the user is forced to stop, look up the correct value in ISO 15065:2005 Table 1, and manually enter it. This breaks the workflow and introduces a risk of human error — especially since all other parameters are already handled automatically by Creo.

ISO Requirements: The outer diameter field is not a design choice — it is calculated directly from the pilot diameter and the 90° angle that ISO already defines. Creo has all the information needed to fill this field automatically.


Optional Expected behavior: The outer diameter should be auto-populated from ISO 15065:2005 Table 1, which fully specifies this value (Dc = 4.4–4.5 mm for M2). All other fields — pilot hole diameter, angle, and depth — are correctly auto-filled from the same standard.

Proof of inconsistency: When using the UNF standard, all fields including the outer diameter are populated automatically. This confirms the issue is specific to the ISO implementation, not a deliberate design decision.

Reference: ISO 15065:2005, Table 1

thanks 
Yuval.D

1 reply

tbraxton
22-Sapphire II
22-Sapphire II
May 28, 2026

In Creo 10.0.9.0 only the ISO holes smaller than m3 exhibit this behavior. M3 and larger holes have the c’sink diameter populated automatically. Does the relevant ISO standard document c’sink geometry for holes smaller than this size? If so, then you should open a support call with PTC as this may be a bug.