Career profile · 51-2031
Engine and Other Machine Assemblers
Construct, assemble, or rebuild machines, such as engines, turbines, and similar equipment used in such industries as construction, extraction, textiles, and paper manufacturing.
What the work can involve
- Read and interpret assembly blueprints or specifications manuals, and plan assembly or building operations.
- Inspect, operate, and test completed products to verify functioning, machine capabilities, or conformance to customer specifications.
- Position or align components for assembly, manually or using hoists.
- Set and verify parts clearances.
- Verify conformance of parts to stock lists or blueprints, using measuring instruments such as calipers, gauges, or micrometers.
- Fasten or install piping, fixtures, or wiring and electrical components to form assemblies or subassemblies, using hand tools, rivet guns, or welding equipment.
Selected core tasks from O*NET 31.0. Responsibilities vary by employer, specialization and experience.
Preparation and entry routes
This broad O*NET group commonly involves some prior preparation and on-the-job learning. Check the specific employer, occupational credential and state requirements.
Check the route for the specific occupation where you plan to work. Education, employer experience requirements, occupational licensing and industry certification can be separate steps.
Understand the different credentials →Skills used in this occupation
- Reading Comprehension
- Active Listening
- Critical Thinking
- Monitoring
- Speaking
Selected from the highest importance ratings available in O*NET 31.0. These describe the occupation, not a particular school's curriculum.
Knowledge to build
- Mechanical
- Production and Processing
- Customer and Personal Service
- Engineering and Technology
- Mathematics
Selected from the highest importance ratings available in O*NET 31.0. These describe the occupation, not a particular school's curriculum.
Common work activities
- Handling and Moving Objects
- Controlling Machines and Processes
- Inspecting Equipment, Structures, or Materials
- Performing General Physical Activities
- Getting Information
Selected from the highest importance ratings available in O*NET 31.0. These describe the occupation, not a particular school's curriculum.
Training subjects to investigate
The federal education-to-occupation crosswalk connects this role to the subjects below. These links do not endorse a school or guarantee that any particular award qualifies a graduate for the job.
Working conditions to consider
These are the most common published responses to selected O*NET work-setting questions. They describe occupation-level survey findings, not every employer or a particular job.
| Work-setting question | Most common response | Share giving that response |
|---|---|---|
| Contact With Others | Constant contact with others | 54.3%07/2014 · sample 38 |
| Exposed to Contaminants | Every day | 52.1%07/2014 · sample 38 |
| Exposed to Disease or Infections | Never | 99.7%07/2014 · sample 38 |
| Exposed to Hazardous Conditions | Every day | 28.6%07/2014 · sample 38 |
| Spend Time Sitting | Less than half the time | 60.3%07/2014 · sample 38 |
| Spend Time Standing | More than half the time | 47.9%07/2014 · sample 38 |
| Spend Time Using Your Hands to Handle, Control, or Feel Objects, Tools, or Controls | Continually or almost continually | 81.4%07/2014 · sample 38 |
| Time Pressure | Every day | 56.1%07/2014 · sample 38 |
| Wear Common Protective or Safety Equipment such as Safety Shoes, Glasses, Gloves, Hearing Protection, Hard Hats, or Life Jackets | Every day | 90.9%07/2014 · sample 38 |
| Work Schedules | Regular (established routine, set schedule) | 65.5%07/2014 · sample 38 |
O*NET 31.0 Work Context, selected topics. Only unsuppressed source responses with sample size at least 10 are shown. A most-common response need not be a majority. Sampling uncertainty applies; source dates vary. Ask employers about actual schedules, accessibility, protective equipment and working conditions.
Software used in the workplace
Use these O*NET examples to ask how a course builds practical digital skills. They are workplace examples, not a required shopping list or confirmation of a school’s curriculum.
- Computer aided design CAD software: Computer aided design and drafting CADD software, Dassault Systemes SolidWorks
- Enterprise resource planning ERP software: SAP software
- Office suite software: Microsoft Office software
- Spreadsheet software: Microsoft Excel
- Word processing software: Microsoft Word
Selected categories and examples from O*NET 31.0 Software Skills. Products and employer requirements change. These examples are not endorsements; check the complete official occupation profile.
Pay & employment outlook
Salary estimates for engine and other machine assemblers
The median divides workers into two equally sized groups by pay. It is not a starting salary, a school’s graduate outcome or a promise of employment. Lower percentiles are not automatically new graduates.
National outlook: 2025–2035
- Typical education for entry
- High school diploma or equivalent
- Related work experience
- None
- Typical on-the-job training
- Moderate-term on-the-job training
BLS national employment projections, 2025–2035. Openings include people leaving occupations or the labor force; these are not advertised vacancies. Education categories describe typical entry, not legal eligibility or a guarantee that any specific program is sufficient.
Compare wages across 36 state/DC estimates
| State | Annual median | Hourly median | Employment |
|---|---|---|---|
| Alabama | Not published | Not published | 2,520 |
| Arizona | $54,100 | $26.01 | 80 |
| Arkansas | $54,620 | $26.26 | 70 |
| California | $46,810 | $22.51 | 1,170 |
| Colorado | $46,070 | $22.15 | Not published |
| Connecticut | $61,320 | $29.48 | 170 |
| Florida | $52,660 | $25.32 | 800 |
| Georgia | $38,540 | $18.53 | 410 |
| Idaho | $54,240 | $26.08 | 70 |
| Illinois | $49,630 | $23.86 | 650 |
| Iowa | $46,040 | $22.13 | 60 |
| Kansas | $42,590 | $20.48 | Not published |
| Kentucky | $41,580 | $19.99 | 1,180 |
| Maryland | $39,120 | $18.81 | 90 |
| Massachusetts | $46,880 | $22.54 | 500 |
| Michigan | $60,950 | $29.31 | 5,030 |
| Minnesota | $58,820 | $28.28 | 270 |
| Mississippi | $46,610 | $22.41 | 580 |
| Missouri | $46,720 | $22.46 | 1,020 |
| Nebraska | $49,590 | $23.84 | 110 |
| New Hampshire | $70,150 | $33.73 | 160 |
| New Jersey | $50,910 | $24.47 | 140 |
| New York | $46,460 | $22.34 | 1,330 |
| North Carolina | $45,750 | $22.00 | 2,750 |
| Ohio | $74,750 | $35.94 | 3,430 |
| Oklahoma | $45,060 | $21.67 | 130 |
| Oregon | $63,420 | $30.49 | 110 |
| Pennsylvania | $52,000 | $25.00 | 90 |
| South Carolina | $46,950 | $22.57 | 1,960 |
| South Dakota | $45,930 | $22.08 | 550 |
| Tennessee | $46,810 | $22.50 | 430 |
| Texas | $47,210 | $22.70 | 490 |
| Utah | $48,730 | $23.43 | 150 |
| Virginia | $36,030 | $17.32 | 570 |
| Washington | $72,800 | $35.00 | 370 |
| Wisconsin | $54,240 | $26.08 | 860 |
Metropolitan and nonmetropolitan wages
Search the 56 published local-area estimates for this occupation. Metropolitan areas can cross state lines; a city’s postal name is not necessarily the statistical area’s name.
Sources: BLS May 2025 OEWS public downloads and 2025–2035 employment projections, retrieved September 9, 2026. Unpublished estimates stay unavailable. “+” means BLS’s upper reporting threshold ($239,200 annually or $115 hourly). Wages exclude self-employment and nonwage benefits. How to interpret these figures.
Compare the route and prepare for work
Questions to test the fit
- What does an entry-level working day look like, and how does it differ from the experienced role described here?
- Which tasks, work environments and schedules would I enjoy or find difficult?
- What education, supervised practice and credentials do local employers actually request?
- Can I speak with someone in the occupation or arrange a suitable workplace visit?
- How does the complete training cost compare with my realistic budget and available routes?
Sources and attribution
This page includes information from the O*NET 31.0 Database by the U.S. Department of Labor, Employment and Training Administration (USDOL/ETA), used under CC BY 4.0. Trade School Guides selects and organizes the material and adds explanatory guidance. USDOL/ETA has not approved, endorsed or tested these modifications. Occupation code: 51-2031.00.
Training connections: CIP 2020–SOC 2018 crosswalk. Snapshot: September 8, 2026. See the methodology.