1.1 Current Exam Facts

ASME GDTP Senior Level — Current Exam Facts (Y14.5-2009)

Quick Answer: The ASME GDTP Senior Level exam based on ASME Y14.5-2009 is a 150-question, 6-hour, closed-book, multiple-choice exam administered at Prometric centers. It costs $623 (retest $413) and requires a 78% overall score with at least 50% in each of seven weighted content categories. Candidates must document a minimum of 3 years of relevant GD&T professional experience.

The ASME Geometric Dimensioning and Tolerancing Professional (GDTP) Senior Level certification, based on ASME Y14.5-2009, is the senior of ASME's two GDTP tiers. ASME positions Senior as the design-authority credential: the person who selects geometric controls and applies GD&T to drawings, tooling, and verification. It is distinct from the Technologist tier, which measures interpretation. This guide tracks the Y14.5-2009 Senior exam to match the official practice bank.

Exam Format and Delivery

You take the exam on a Prometric workstation. ASME publishes one hard rule about materials: the examination is closed book, so notes and copies of Y14.5 are out. ASME does not publish a calculator or scratch-paper policy; candidates who have sat the exam consistently report that the test center supplies writing materials and permits a simple non-programmable calculator, which is the normal Prometric convention. Treat that as likely but unconfirmed — read the personal-items and calculator rules in your own Prometric confirmation before test day, and prepare as though you must do every calculation by hand. The 6-hour clock is long, but the question bank rewards steady discipline — budget about 2.4 minutes per question and protect the last 30 minutes for review. A practical exam-day tactic is to answer the high-weight categories (Datum, Location, Profile) first while you are fresh, then sweep the small categories, and finish with flagged calculation questions rather than burning minutes early on a single hard stack.

Passing Score: 78% Overall + 50% per Category

To pass Y14.5-2009 Senior you must achieve at least 78% overall AND at least 50% in EACH of the seven content categories. A high overall score cannot rescue a failing category: a candidate who scores 90% overall but 48% in, say, Runout, fails the exam. Conversely, a candidate who scores exactly 78% overall with every category at or above 50% passes. This rule is why the blueprint weights below drive every study plan in this guide — you cannot ignore a small category, because 50% is still a hard floor.

Worked Example

Imagine two candidates:

• Candidate A: 92% overall, 49% in Runout, every other category above 70%. Result: Fail — Runout is below 50%.
• Candidate B: 79% overall, 51% in every category. Result: Pass — clears both the 78% overall floor and the 50% per-category floor.

Candidate A's 92% is irrelevant. The per-category floor is absolute, not averaged.

The Seven Content Categories and Weights

ASME's 2026 handbook labels these categories Scope, General Dimensioning, and Symbology and Datum Reference Frames; the program page uses the shorter Dimensioning and Symbology and Datum Referencing. Same content, two labels. Datum Referencing (30%) and Location (25%) together drive more than half the exam. Profile (20%) is the third heavyweight. Treat these three as the spine of your preparation. The four small categories (Dimensioning & Symbology, Form, Orientation, Runout) still matter — the 50% floor applies to each — but they will not make or break your score the way the big three will.

Eligibility and Experience

• Experience required: a minimum of 3 years of relevant GD&T professional experience. ASME's 2026 Applicant Information Handbook specifies that the description must cover work personally performed by the applicant within the last 3 years and must demonstrate independent application of GD&T principles. (Legacy "five years" copy still appears in places on ASME's program page; the 2026 handbook is the current applicant-facing document and is what ASME directs applicants to. If your application predates the change, confirm with ASME Customer Care.)
• Technologist certification is NOT a prerequisite. You may sit Senior directly if you meet the experience requirement.
• ASME membership is NOT required. The fees above are the same for members and non-members.

The experience log is the most common application stumbling block. Record employer, dates, role, and the GD&T tasks performed (selection, application, verification, gaging). Vague entries such as "used GD&T at work" are the kind of documentation ASME rejects.

Results, Validity, and Recertification

• Results: Emailed within 24-48 hours of the exam, including the percentage correct within each part. ASME does not release scores by phone. A request to have failing results reviewed must be submitted in writing within 30 days of the notification date.
• Certificate validity: 3 years from issuance.
• Recertification: $125 via ASME PC-Connect, requiring verification of at least 24 months of GD&T involvement during the validity period. No retest is required if the recertification requirements are met.
• Expiry notice: ASME notifies certificate holders at least six months before the expiration date on the certificate. Do not represent yourself as GDTP-certified once the 3-year validity lapses; renew through PC-Connect before expiry.

A Note on Revisions

ASME sells both a Y14.5-2009 Senior exam and a Y14.5-2018 Senior exam (150 Q, 6 hr, 74% overall + 50% per section, $495, retest $325), and states that certification is currently based on either the 2009 or the 2018 revision. The Y14.5M-1994 Senior exam remains available on request (150 Q, 6 hr, 80% overall, retest $413). This guide teaches the Y14.5-2009 Senior blueprint, which matches the official practice bank, and Section 1.4 maps the 2018 exam and its deltas. Passing one revision does not certify you in another — see Section 1.2 for the full comparison.