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This group performs some or all of the following duties:

• Read and interpret blueprints, sketches and diagrams to determine assembly operations
• Fit and assemble prefabricated metal parts to build heavy industrial machinery and equipment such as construction, farming, and processing machinery, railway vehicles and aircraft engines
• Move and align subassemblies and components using lifting and transporting devices such as overhead cranes
• Install major components such as gears, pumps, motors or hydraulic assemblies
• Inspect parts, subassemblies and finished products to ensure quality.

• Completion of secondary school is usually required.
• Completion of a mechanical apprenticeship program, such as millwrighting, machining, pipefitting, automotive service or heavy equipment repair or completion of a four-year machine fitter apprenticeship program or completion of five years of on-the-job training is usually required.
• Completion of a two- to three-year college program in aircraft manufacturing or general fabrication is required for aircraft engine fitters.
• Certification in a related trade may be required.

• Progression to supervisory positions is possible with experience.

• Aircraft assemblers (in 9521 Aircraft assemblers and aircraft assembly inspectors)
• Assemblers of electrical industrial equipment (in 9525 Assemblers, fabricators and inspectors, industrial electrical motors and transformers)
• Mechanical assemblers and inspectors (9526)
• Millwrights (in 7311 Construction millwrights and industrial mechanics)
• Supervisors of machine fitters (in 7301 Contractors and supervisors, mechanic trades)
• Welders and related machine operators (7237)