- Decoding the Label: Word by Word
- Who Runs the Exam and What the Acronym Does Not Mean
- What the Exam Actually Covers
- Format, Fees, and Testing Logistics
- Who Sits for It and Who Hires These Engineers
- The Licensure Path Behind the Name
- Scheduling Your Prep Around the Six Domains
- Frequently Asked Questions
- PE-M:MD&M stands for Principles and Practice of Engineering - Mechanical: Machine Design and Materials, an NCEES licensure exam.
- The exam has 80 questions, an 8-hour testing clock, and is delivered at Pearson VUE test centers.
- Mechanics of Materials (17-26 questions) and Mechanical Components and Assemblies (16-24) carry the largest question ranges.
- NCEES charges US$400 per attempt; your state board sets eligibility and may charge separate application fees.
Decoding the Label: Word by Word
The string "PE-M:MD&M" looks like alphabet soup, but every piece maps to a specific part of the official exam name: PE Mechanical: Machine Design and Materials. Spelled out in full, it is the Principles and Practice of Engineering - Mechanical: Machine Design and Materials examination.
- PE is Principles and Practice of Engineering, the NCEES exam family that licensed engineers take after the Fundamentals of Engineering (FE) exam and a period of work experience.
- M is Mechanical, the engineering discipline the exam belongs to.
- MD&M is Machine Design and Materials, the specific exam within the mechanical discipline.
That last piece matters. NCEES offers more than one Mechanical PE exam, and each targets a different slice of the discipline. The Machine Design and Materials exam is the one aimed at engineers whose daily work involves sizing shafts, selecting fasteners, specifying bearings and gears, evaluating fatigue, and choosing materials that survive their service environment. If you want a broader introduction, our overview pages What Is PE-M:MD&M? and PE-M:MD&M Meaning cover the same ground from other angles.
Who Runs the Exam and What the Acronym Does Not Mean
The exam is created and administered by the National Council of Examiners for Engineering and Surveying (NCEES). NCEES writes the exam specifications, assembles and scores the exam, and reports results. It is delivered in person at approved Pearson VUE test centers.
NCEES does not decide who gets a license. That authority belongs to the state or territorial licensing board you apply through. Boards set eligibility rules, approve your application, and control license renewal and continuing-professional-competency requirements. This division of labor explains a point that confuses many candidates: passing the exam is necessary for licensure but is not the same thing as holding a license.
For the same reason, the exam is not a "certification" in the renewable sense. There is no NCEES certificate that expires and needs recertification. If you pass, your license status and renewal cycle are managed by your board. Pages such as PE-M:MD&M Certification and What Is PE-M:MD&M Certification? discuss how the term "certification" is used loosely in this context.
What the Exam Actually Covers
The current NCEES specification, effective beginning with the October 2025 examinations, organizes the exam into six numbered objectives. NCEES publishes question-count ranges for each rather than fixed percentage weights, so the figures below are official ranges, not percentages.
| Domain | Name | Questions (official range) |
|---|---|---|
| 1 | Basic Engineering Practice | 11-17 |
| 2 | Mechanics of Materials | 17-26 |
| 3 | Mechanical Attachments | 9-14 |
| 4 | Power Transmission | 9-14 |
| 5 | Mechanical Components and Assemblies | 16-24 |
| 6 | Supportive Knowledge (Machine Design and Materials) | 8-12 |
Two domains dominate: Mechanics of Materials has the largest range, followed by Mechanical Components and Assemblies. Together they account for a large share of the 80 questions, which is why many candidates anchor their prep there. For a deeper breakdown, see PE-M:MD&M Exam Domains 2026: Complete Guide to All 6 Content Areas.
Domain 2: Mechanics of Materials
The heaviest domain. Expect to move fluidly between stress, strain, and failure analysis, and to apply the right criterion for the material and loading in front of you.
- Stress and strain states, including combined loading
- Deflection and stiffness of beams, shafts, and structural members
- Failure theories for ductile and brittle materials
- Fatigue and fracture considerations under cyclic loading
Domain 5: Mechanical Components and Assemblies
The second-largest domain, covering the hardware that makes up real machines.
- Selection and sizing of bearings, springs, and shafts
- Gears, couplings, and other drivetrain elements
- Sealing, lubrication, and assembly considerations
- Integrating components so the assembly meets its functional requirements
Domains 3 and 4: Mechanical Attachments and Power Transmission
Smaller question ranges, but they reward precise, procedural knowledge.
- Bolted, riveted, welded, and other joint types and their failure modes
- Gear trains, belt and chain drives, and shaft-based power transfer
- Torque, speed, and efficiency relationships through a drivetrain
Domains 1 and 6: Basic Engineering Practice and Supportive Knowledge
These support the technical core and are easy to underestimate.
- Engineering fundamentals, units, and professional judgment
- Materials selection and the supportive knowledge that frames design decisions
The illustrative subtopics above are examples, not an exhaustive list. The exact blueprint is the NCEES specification PDF, and you should always work from the currently linked October 2025 CBT32 version rather than older eight-topic prep summaries or the superseded 2020 outline.
Format, Fees, and Testing Logistics
Exam Structure
The exam contains 80 questions, which include unidentified unscored pretest items. You cannot tell which questions are pretest, so treat every question as scored. The testing time is 8 hours; the full appointment is 9 hours, which includes a 2-minute nondisclosure agreement, an 8-minute tutorial, and a 50-minute scheduled break. The exam has two sections that share the testing clock, and once you submit a section you cannot reopen it.
Question types go beyond standard multiple choice. Expect multiple-correct, point-and-click, drag-and-drop, and numerical fill-in items alongside traditional multiple-choice questions. Scored items receive correct or incorrect credit with no partial credit, and there is no deduction for wrong answers, so you should answer everything.
Reference Materials and Calculator
The exam is closed book. You work from the supplied searchable electronic reference handbook, and personal reference materials are prohibited. One NCEES-approved calculator is allowed. Both SI and USCS units appear. Practicing with the handbook's search function before test day is one of the most practical things you can do, because hunting for a table under time pressure is a real cost over an 8-hour exam. If you want a condensed pre-exam review, see the PE-M:MD&M Cheat Sheet 2026.
Cost and Scheduling
| Item | Detail |
|---|---|
| NCEES exam fee | US$400 per attempt |
| Board application fees | Set separately by your licensing board; can apply |
| Delivery | Computer-based, in person at approved Pearson VUE centers |
| Availability | Year-round, with linear-on-the-fly exam assembly (LOFT) |
| Official practice exam (e-book) | $59.95; 80 questions with solutions |
Because testing is year-round, there is no single national exam date to chase, though your board's approval timeline effectively sets your window. Our guides on exam dates and scheduling and total certification cost go into the mechanics in detail.
Pass Rates in Context
NCEES's table, updated July 2026 and covering the January-June 2026 testing population, shows a 61% first-time pass rate (401 examinees) and a 39% repeat pass rate (140 examinees). Those are small populations over a six-month window, so treat them as a snapshot rather than a stable long-run figure. The gap between first-time and repeat takers is the more useful signal: preparation that targets weak domains before the first attempt appears to matter. More on this in PE-M:MD&M Pass Rate 2026 and How Hard Is the PE-M:MD&M Exam?.
Who Sits for It and Who Hires These Engineers
The exam is built for mechanical engineers whose work centers on designing and specifying machinery and selecting materials. Typical employers and settings include:
- Industrial equipment and machinery manufacturers, where shaft, gear, bearing, and fastener decisions are daily work
- Automotive, aerospace, and heavy-equipment suppliers that design drivetrains and mechanical assemblies
- Consulting firms that perform failure analysis, design reviews, and forensic investigations
- Energy, process, and materials-handling companies that specify rotating equipment and structural mechanical components
- Government labs and defense contractors working on mechanical systems and materials performance
Employment varies by industry, and not every machine-design role requires a license. Licensure matters most when you sign and seal drawings, offer services to the public, or advance into roles that require a PE. For the pay picture, the BLS reports a median annual wage of $104,110 for mechanical engineers as of May 2025. That figure covers the entire occupation; it is not specific to this exam track and does not measure a PE licensure premium. Our salary guide, ROI analysis, and jobs overview unpack this further.
The Licensure Path Behind the Name
Eligibility to sit for the exam is controlled by the board you apply through, so there is no single universal prerequisite. A common licensure pathway looks like this:
- Earn an engineering bachelor's degree from an EAC/ABET-accredited program.
- Pass the FE exam.
- Complete four years of acceptable engineering experience.
- Pass the PE exam.
Treat this as a typical route, not a rule. Some boards allow you to sit for the exam earlier or on a different timeline, and some have additional requirements. Separately, NCEES Record applications for engineering use five U.S.-licensed engineer references, but that is a records-program requirement, not a universal condition for taking the exam. Always confirm the specifics with your board. Our requirements guide walks through the common variations.
Key Takeaway
Check your board's rules first. Eligibility, approval timing, and renewal all run through the board, not NCEES. Starting that application early can matter more than any study-schedule decision.
Scheduling Your Prep Around the Six Domains
Rather than a generic study plan, let the domain question ranges drive your calendar. A simple allocation that follows the blueprint:
Mechanics of Materials (Domain 2)
- Largest question range, so start here while energy is high
- Drill combined loading, failure theories, and fatigue calculations until setup is automatic
Mechanical Components and Assemblies (Domain 5)
- Second-largest range and highly applied
- Work bearing, spring, shaft, and gear problems using the electronic handbook's search
Mechanical Attachments and Power Transmission (Domains 3-4)
- Smaller ranges, procedural content
- Practice joint and drivetrain problems that reward careful unit handling in SI and USCS
Basic Engineering Practice and Supportive Knowledge (Domains 1 and 6), then full-length practice
- Close gaps in fundamentals and materials knowledge
- Take a timed run of the official NCEES practice exam and review every miss against the spec
Adjust for your own background: someone who designs gearboxes at work may shorten the Power Transmission block and extend Mechanics of Materials. Note that the official practice exam has posted errata, so check the NCEES errata page if a solution looks off. For a full plan, read the PE-M:MD&M Study Guide 2026, and when you are ready to test yourself, use our practice test platform to build speed with alternative item types.
Your ability to answer unfamiliar item formats, like drag-and-drop and numerical fill-in, is a skill separate from content knowledge. Make sure your practice includes them, and consider supplementing official materials with additional timed questions from the PE-M:MD&M practice question bank.
Frequently Asked Questions
It stands for Principles and Practice of Engineering - Mechanical: Machine Design and Materials, the NCEES exam officially labeled PE Mechanical: Machine Design and Materials. See also What Does PE-M:MD&M Stand For? and What Does PE-M:MD&M Mean?
NCEES administers the exam. It is computer-based and delivered in person at approved Pearson VUE test centers, with year-round availability.
There are 80 questions, including unidentified unscored pretest items, with 8 hours of testing time inside a 9-hour appointment that includes a 50-minute scheduled break.
Mechanics of Materials has the largest official range at 17-26 questions, followed by Mechanical Components and Assemblies at 16-24.
No. It is a licensure examination, not a separately renewable NCEES certification. Your state or territorial board sets PE license renewal periods and continuing-professional-competency requirements.
If you are building a path toward the exam, start with the board requirements, map your prep to the six domains above, and use realistic timed practice to get comfortable with the format before test day.