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Plastic Injection Molding Machine Operator Jobs in Arnold, MO

Semco

Union Machine Operator

Saint Louis, MO · On-site

$16.75 - $18.75/hr

Working closely with the Shift and People Supervisors as well as other Machine Operators, you'll be operating various blow-molding and injection presses to create products for our customers. This job ...

QPS

2nd shift - Production Supervisor

Hazelwood, MO · On-site

Oversee mold changes, machine startups, and troubleshooting, working closely with Process ... plastic injection molding or a similar manufacturing environment. * Strong understanding of ...

QPS

2nd shift - Production Supervisor

Hazelwood, MO · On-site

Oversee mold changes, machine startups, and troubleshooting, working closely with Process ... plastic injection molding or a similar manufacturing environment. * Strong understanding of ...

Serioplast

Machine Operator

Saint Louis, MO · On-site

$16.50 - $19.50/hr

Serioplast , a Global Leader in Rigid Plastic Packaging , is looking for a Machine Operator for the ... Good knowledge of plastic molding technologies (EBM and/or SBM and/or IM). * Good applied knowledge ...

Serioplast

Machine Operator

Saint Louis, MO · On-site

$16.50 - $19.75/hr

Serioplast , a Global Leader in Rigid Plastic Packaging , is looking for a Machine Operator for the ... Good knowledge of plastic molding technologies (EBM and/or SBM and/or IM). * Good applied knowledge ...

Serioplast

Plastic Extrusion Operator

Saint Louis, MO · On-site

Operate and monitor the machine and its parts to ensure efficiency and quality, and support experts ... Good knowledge of plastic molding technologies, specifically extrusion blow molding (EBM). * Good ...

Serioplast

Plastic Extrusion Operator

Saint Louis, MO · On-site

Operate and monitor the machine and its parts to ensure efficiency and quality, and support experts ... Good knowledge of plastic molding technologies, specifically extrusion blow molding (EBM). * Good ...

ALPLA Group

Machine Operator

Saint Peters, MO · On-site

$16.25 - $19.25/hr

Prepare machine for mold change * Ensure goods are produced in correct quantity and in accordance ... Technical/mechanical background in Plastics Industry preferred * Basic computer skills

Alpla Inc.

Machine Operator

Saint Peters, MO

$16.25 - $19.25/hr

Prepare machine for mold change * Ensure goods are produced in correct quantity and in accordance ... Technical/mechanical background in Plastics Industry preferred * Basic computer skills

CPAY Staffing & Recruiting

Machine Operator

O Fallon, MO · On-site

$16/hr

Safely and efficiently operate assigned molding or secondary operation machines to maintain optimal ... Skillful use of hands and fingers to handle and inspect plastic parts ranging in size from 0.25" to ...

Bachman Machine Company

Tool and Die Maker

Saint Louis, MO · On-site

$25.25 - $31.75/hr

... dies, production CNC machining, and plastic injection molded components. We combine deep ... and operating manual and CNC machine tools; performing precision machining, fitting, and ...

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Plastic Injection Molding Machine Operator information

See Arnold, MO salary details

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$16

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How much do plastic injection molding machine operator jobs pay per hour?

As of Sep 6, 2026, the average hourly pay for plastic injection molding machine operator in Arnold, MO is $16.11, according to ZipRecruiter salary data. Most workers in this role earn between $14.47 and $17.26 per hour, depending on experience, location, and employer.

What is a plastic injection molding machine operator?

A Plastic Injection Molding Machine Operator is responsible for setting up, operating, and monitoring injection molding machines used to produce plastic parts. They ensure machines run efficiently, troubleshoot issues, perform quality checks, and maintain a clean work environment. Operators may also adjust machine settings, replace molds, and inspect finished products for defects. Their role is essential in manufacturing industries that produce plastic components for automotive, medical, and consumer goods.

What does a plastic injection molding machine operator do during a typical shift?

As a Plastic Injection Molding Machine Operator, your typical shift will involve setting up and monitoring injection molding machines, inspecting finished products for quality, and performing minor equipment maintenance as needed. You will often work on your feet for extended periods in a manufacturing environment and may rotate between day, evening, or overnight shifts depending on the employer. Teamwork is important, as you'll frequently collaborate with supervisors, quality control personnel, and other machine operators to meet production goals. Staying vigilant and responsive to machine alarms or quality issues is a key part of the daily routine.

What are the key skills and qualifications needed to thrive as a plastic injection molding machine operator?

To thrive as a Plastic Injection Molding Machine Operator, you need a good understanding of machine operation, mechanical aptitude, attention to detail, and a high school diploma or equivalent. Familiarity with industry-standard molding machines, quality inspection tools, and safety protocols, as well as certificates in manufacturing or machine operation, are often advantageous. Strong problem-solving skills, teamwork, and effective communication help individuals excel in this role. These abilities ensure efficient production runs, high-quality products, and a safe, collaborative work environment.

What cities near Arnold, MO are hiring for Plastic Injection Molding Machine Operator jobs?

Cities near Arnold, MO with the most Plastic Injection Molding Machine Operator job openings:

Plastic Injection Molding Machine Operator jobs near you
Infographic showing various Plastic Injection Molding Machine Operator job openings in Arnold, MO as of August 2026, with employment types broken down into 89% Full Time, and 11% Part Time. Highlights an 100% In-person job distribution, with an average salary of $33,499 per year, or $16.1 per hour.

Union Machine Operator

Semco

Saint Louis, MO • On-site

$16.75 - $18.75/hr

Full-time

Re-posted 15 days ago

Job description

Company Overview
Semco-Tank Holding has become the market leader and manufacturer of rotationally molded poly and welded steel bulk storage and material handling products in North America. Semco-Tank is growing rapidly and is always working to expand its capabilities and diversify product offerings consistent with the company values of growth and service to its customers.
Job Summary
We're looking for a Machine Operator to join the Semco-Tank team! Working closely with the Shift and People Supervisors as well as other Machine Operators, you'll be operating various blow-molding and injection presses to create products for our customers.
This job is for you if...
  • You are detail oriented and love creating and completing quality product.
  • You are a sound communicator and self-starter.
  • You thrive in a fast-paced environment and enjoy collaboration.

Key Responsibilities
  • Operate molding machines and secondary equipment in a safe and efficient manner.
  • Ensure good quality parts are produced.
  • Read and follow the standard work instructions.
  • Communicate effectively with other operators, supervisors, and other staff.
  • Organize and clean work areas during shift.
  • Adhere to safety practices while performing operating tasks
  • Successfully use tools and PPE.

Knowledge, Skills and Abilities
  • Industry experience (preferred): 1 Year

Physical Requirements
The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.
  • Occasionally, it represents 1 to 33% or 1-2 hours of an 8-hour workday.
  • Frequently, it represents 34 to 66% or 2 1/2 to 5 1/2 hours of an 8-hour workday.
  • Regularly, it represents 67 to 100% or 6 to 8 hours of an 8-hour workday.
  • While performing the duties of this Job, the employee is regularly required to stand; walk; use hands to finger, handle, or feel; reach with hands and arms and talk or hear. The employee is occasionally required to climb or balance and stoop, kneel, crouch, or crawl. The employee must regularly lift and /or move up to 50 pounds. Specific vision abilities required by this job include close vision, color vision and peripheral vision.
  • Work Environment The work environment characteristics described here are representative of those an employee encounters while performing the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

While performing the duties of this Job, the employee is occasionally exposed to warm and/or cold conditions; moving mechanical parts; high, precarious places; toxic or caustic chemicals and outside.
Travel
The percentage of travel is 0% outside of your regular shift time.
AAP/EEO Statement
Tank Holding provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, creed, ancestry, sexual or affectional orientation, marital or veteran status, color, religion, sex, national origin, age, disability, genetics, status with regard to public assistance or any characteristic protected under federal, state or local law.
Other Duties
Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

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