If you need proof that one person knows GD&T, for their career, a customer, or a job requirement, ASME's GDTP certification is the recognized credential. If your problem is drawings that people read differently, parts that fail inspection, or disputes with suppliers, certifying individuals won't fix it. That takes the whole team learning to apply GD&T the same way on your own parts. Many companies end up wanting both, and the order matters.
What ASME's GDTP certification is
GDTP stands for Geometric Dimensioning and Tolerancing Professional. It is ASME's personnel certification for the Y14.5 standard, and it has two levels. Here is what ASME's certification page lists for each:
| ASME GDTP | Technologist | Senior |
|---|---|---|
| What it shows | Understanding the rules, definitions, principles, and symbols and modifiers of GD&T as applied to drawings | Understanding tolerance calculation, datum feature selection, modifiers, and composite tolerances |
| Exam | 150 scored multiple-choice questions, closed book, up to 4 hours | 150 scored multiple-choice questions, closed book, up to 6 hours |
| Experience required | None | Three years (36 months) of documented GD&T experience |
| Fee for the 2018-based exam | $395 | $495 |
Both exams are taken at Prometric testing centers and are based on either the 2009 or the 2018 revision of Y14.5, with the 1994 version available on request. ASME membership isn't required. Certificates expire three years after they're issued, and recertifying requires documented GD&T experience. All of this comes from ASME's GDTP page; check it for current fees and retest rules before you register anyone.
What certification does for a company, and what it doesn't
Certification gives you a third-party measure of what one person knows. That matters when a customer, a contract, or a job description asks for it, and it gives a lead designer or drawing checker an outside benchmark for the role.
What the exam can't do is change how the rest of the team works. It tests knowledge of the standard with multiple-choice questions. It doesn't look at your drawings, it doesn't get design, manufacturing, and quality to agree on how your parts are dimensioned, and it doesn't cover how your suppliers set up and inspect your parts. One certified engineer on a team of ten still leaves nine people reading the drawings their own way.
When certification is the right choice
Point someone toward GDTP when:
When team training does more
Train the team when the problem shows up in the work itself:
Team training built on your own drawings solves these because everyone learns the same approach on the parts they actually make. Our on-site GD&T course runs two days, about 14 hours, and costs $8,000 for up to 8 participants, then $300 for each additional person, up to 16. For teams that already know the basics, the half-day refresher and drawing review is $2,500 for up to 12 people.
Participants receive a certificate of completion. It isn't a third-party certification like GDTP, but the course covers the concepts those exams test, so it's also a good first step for anyone who later sits for the exam.
Comparing the two side by side
| Question | GDTP certification | Team training on your drawings |
|---|---|---|
| Who it's for | One person at a time | The whole team together |
| What it proves or changes | What an individual knows about Y14.5 | How your team applies Y14.5 to your parts |
| Uses your drawings | No | Yes |
| Aligns design, manufacturing, and quality | No | Yes |
| Recognized outside your company | Yes | Certificate of completion only |
| Time | Self-study plus an exam of up to 4 or 6 hours | Two days on-site, or a half day for a refresher |
Using both, in the right order
When a company wants both, this order works well:
Next step
If your problem is how the team applies GD&T, tell us about your team size, drawings, and timing, and you'll get a written proposal with dates and a final price within one business day. Request a proposal for on-site GD&T training, or browse all corporate training programs.
