PE-M:MD&M Exam Domains 2026: Complete Guide to All 6 Content Areas

How the NCEES Blueprint Is Built

The PE Mechanical: Machine Design and Materials exam is administered by the National Council of Examiners for Engineering and Surveying (NCEES). Its content is defined by a published specification, the current version being the October 2025 CBT32 file, effective beginning with the October 2025 examinations. That document lists six numbered objectives, and those six headings are the official exam domains discussed throughout this guide.

One point trips up many candidates: the specification does not publish fixed percentage weights. Instead, NCEES gives each domain a range of questions. Because the exam contains 80 questions in total, including unidentified unscored pretest items, those ranges overlap and cannot be cleanly converted into percentages. Anyone quoting a precise "22% for Domain 2" is inventing a number the blueprint does not contain.

For a broader plan built around these domains, see our PE-M:MD&M study guide. This article focuses on what each domain actually asks of you.

Format, Fees and Testing Conditions

Knowing the delivery format shapes how you study each domain, because the question types influence how deeply you must calculate versus recognize.

• Questions: 80 total, including unidentified unscored pretest items.
• Testing time: 8 hours, within a 9-hour appointment that includes a 2-minute nondisclosure agreement, an 8-minute tutorial and a 50-minute scheduled break.
• Item types: multiple-choice plus alternative formats such as multiple-correct, point-and-click, drag-and-drop and numerical fill-in.
• Scoring: correct/incorrect credit per scored item, no partial credit, no deduction for wrong answers.
• Delivery: computer-based at approved Pearson VUE test centers, offered year-round using linear-on-the-fly exam assembly (LOFT).
• References: closed book, with a supplied searchable electronic reference handbook. Personal reference materials are prohibited, and you may use one NCEES-approved calculator.
• Units: both SI and USCS appear.
• Fee: the NCEES exam fee is US$400 per attempt, and separate board application fees can apply.

The exam is divided into two sections that share the testing clock, and a submitted section cannot be reopened. Budget your time across both before you begin. For the full cost picture, read our certification cost breakdown, and for scheduling details see the exam dates and testing windows guide.

Domain 1: Basic Engineering Practice

Candidates often underestimate this domain because it feels like common sense. With a range of 11-17 questions, it is larger than Mechanical Attachments, Power Transmission or Supportive Knowledge individually. Questions here reward precision about conventions: knowing which standard governs a situation, how a tolerance stack accumulates, and why a particular safety factor is chosen. Use the electronic handbook as a search tool, not a crutch, since you must know what to look for.

Domain 2: Mechanics of Materials

Expect problems that chain several concepts together: a shaft under bending and torsion that must be checked against a failure criterion and then evaluated for fatigue life. Alternative item types such as numerical fill-in reward clean setup and unit discipline. Because this domain has the widest question range, even the low end (17 questions) exceeds the top of several other domains.

Domain 3: Mechanical Attachments

This is a compact domain with highly learnable patterns. Bolted-joint analysis in particular appears in many forms, so practicing the full chain from preload to separation check to fatigue evaluation pays off. Pay attention to the difference between the loads carried by the bolt and by the clamped members, a classic point of confusion.

Domain 4: Power Transmission

Power Transmission questions frequently combine kinematics with strength. You might compute a gear train ratio, convert power to torque, and then size a shaft against fatigue. Domain 2 fluency makes the second half straightforward. Keep USCS and SI conversions clean, because power, speed and torque relationships are unit-sensitive.

Domain 5: Mechanical Components and Assemblies

With a range of 16-24 questions, this domain rivals Mechanics of Materials in total exposure. Bearing life calculations and spring design are recurring staples. Treat the assembly-level thinking seriously: questions may ask how a change to one component affects the behavior of the whole system, not just a single isolated calculation.

Domain 6: Supportive Knowledge

Do not skip this domain because it is smallest. The range of 8-12 questions is still a meaningful share of an 80-question exam, and these items often draw on breadth rather than long calculations, making them efficient points for well-prepared candidates. Familiarity with how processing changes material behavior helps here and also reinforces Domain 2 failure reasoning.

Sequencing the Domains in Your Plan

Sequencing is the one place where study structure genuinely matters, because the domains build on one another. A sensible order follows the dependency chain rather than the numbering.

Practice exams reveal weaknesses far better than rereading notes. You can work through domain-level questions on our PE-M:MD&M practice test site, and take note that the official NCEES practice exam has a posted errata sheet, so check it when a solution looks off. For a deeper view of preparation timing, our study guide expands on pacing, and a quick refresher sheet is available in the cheat sheet article.

Where These Skills Get Used

The six domains map onto real design work. Industries that rely on machine design and materials expertise include manufacturing, aerospace and defense, automotive, heavy equipment, energy, and industrial machinery. Roles that apply this content include mechanical design engineer, product development engineer, materials and failure-analysis engineer, and consulting engineer reviewing equipment for safety or compliance.

For context on pay, the Bureau of Labor Statistics reports a median annual wage of $104,110 for mechanical engineers as of May 2025. That figure covers the occupation as a whole and is not specific to this exam track or a measured licensure premium. For a fuller discussion, see our ROI analysis and salary guide.

Frequently Asked Questions