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Core Assembly Jobs in Riverside, CA (NOW HIRING)

Winpak Ltd

Mechanical Assembler

Rialto, CA · On-site

$24 - $25/hr

Winpak Lane is seeking a Mechanical Assembler to join our Assembly team in Rialto, California. You ... At Winpak, inclusion is one of our core values. We believe that an inclusive culture fosters a ...

Ascent Aerospace, LLC

Estimator

Santa Ana, CA · On-site

Assembly & build * Inspection * Composite tooling * Metallic tooling * Fixtures and jigs * Bond ... Familiarity of requirements from core aerospace customers * Experience with CATIA, NX, SolidWorks ...

MAG INSTRUMENT, INC.

Be Seen First

Engineer/Product Design Drafter

Ontario, CA · On-site

$71K - $90K/yr

They will participate in the coordination, assembly, modification, installation, and repairs of ... Mr. Maglica utilizes a hands-on leadership style with a core philosophy-consistent and superior ...

Novanta

Director of Manufacturing Operations

Irvine, CA · On-site

$178K - $240K/yr

This role oversees assembly, machine shop, clean room operations, manufacturing engineering, and ... At its core, Positioning Solutions partners directly with OEMs to solve complex motion and ...

Karman Space & Defense

Shop Assistant

Brea, CA · On-site

$17 - $20/hr

Department of War and its allies' core mission priorities, and meet the accelerating demand for ... In this role, you support manufacturing operations by performing machining, assembly, and general ...

MAG INSTRUMENT, INC.

Be Seen First

Quality Control Supervisor

Ontario, CA · On-site

$35 - $40/hr

This person will be the primary contact with upper management, Engineering, Machining, Assembly ... Mr. Maglica utilizes a hands-on leadership style with a core philosophy-consistent and superior ...

Senra Systems

Harnessing Technical Trainer

Irvine, CA · On-site

$45 - $60/hr

... assembly tasks into high-throughput production lines. We enable customers to design what they want ... Lead classroom training sessions focused on core manufacturing fundamentals for our apprentice ...

Polaris, Inc.

Assembler

Riverside, CA · On-site

$17 - $22/hr

Core Responsibilities * Perform mechanical assembly of products with complex functions requiring independent judgment * Understand and follow established procedures and processes to safely produce ...

Polaris, Inc.

Assembler

Riverside, CA · On-site

$17 - $22/hr

Core Responsibilities * Perform mechanical assembly of products with complex functions requiring independent judgment * Understand and follow established procedures and processes to safely produce ...

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All JobsCore Assembly JobsCore Assembly Jobs in Riverside, CA

Core Assembly information

See Riverside, CA salary details

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How much do core assembly jobs pay per hour?

As of Sep 15, 2026, the average hourly pay for core assembly in Riverside, CA is $20.32, according to ZipRecruiter salary data. Most workers in this role earn between $17.55 and $22.07 per hour, depending on experience, location, and employer.

What is core assembly?

Core assembly refers to the process of constructing the core components used in manufacturing, most commonly in foundries for metal casting. Workers in core assembly build sand or ceramic cores and molds that shape the internal cavities of metal parts during casting. The job requires attention to detail, precision, and knowledge of safety procedures to ensure quality and consistency in the final products. Core assembly is essential in industries such as automotive, aerospace, and machinery manufacturing. Technicians often use hand tools, machines, and specialized adhesives or coatings as part of the assembly process.

What are the key skills and qualifications needed to thrive as a core assembly worker?

To thrive as a Core Assembly worker, you need manual dexterity, attention to detail, basic mechanical aptitude, and often a high school diploma or equivalent. Familiarity with assembly line tools, blueprints, and quality control systems is typically required, and some positions may prefer certifications in manufacturing or safety. Strong teamwork, problem-solving, and time management skills help individuals excel in fast-paced production environments. These competencies are crucial for ensuring efficient, accurate, and safe assembly of components, directly impacting product quality and operational productivity.

What are some common challenges faced in a core assembly role and how can they be overcome?

Core Assembly professionals often encounter challenges such as maintaining high precision under tight deadlines and adapting to frequent changes in production schedules. Ensuring quality while assembling intricate components requires strong attention to detail and adherence to safety standards. Effective communication with team members and cross-department collaboration can help resolve issues quickly and minimize downtime. Continuous learning and staying updated on new assembly techniques or equipment can also help overcome these challenges and enhance job performance.

What is the difference between Core Assembly vs Machinist?

AspectCore AssemblyMachinist
Required CredentialsHigh school diploma or equivalent; some certifications in assembly or manufacturingHigh school diploma; technical certifications or apprenticeships often preferred
Work EnvironmentFactories, assembly lines, manufacturing plantsMachine shops, manufacturing facilities, workshops
Industry UsageAutomotive, aerospace, electronics manufacturingMetalworking, aerospace, automotive industries

Core Assembly involves assembling components into finished products, focusing on precision and following detailed instructions. Machinists operate and maintain machine tools to produce metal parts, requiring technical skills and knowledge of machining processes. While both roles are essential in manufacturing, Core Assembly emphasizes assembling parts, whereas Machinists focus on creating parts through machining processes.

What are popular job titles related to Core Assembly jobs in Riverside, CA?

For Core Assembly jobs in Riverside, CA, the most frequently searched job titles are:

What job categories do people searching Core Assembly jobs in Riverside, CA look for?

The top searched job categories for Core Assembly jobs in Riverside, CA are:

What cities near Riverside, CA are hiring for Core Assembly jobs?

Cities near Riverside, CA with the most Core Assembly job openings:

Infographic showing various Core Assembly job openings in Riverside, CA as of September 2026, with employment types broken down into 92% Full Time, and 8% Temporary. Highlights an 100% In-person job distribution, with an average salary of $42,259 per year, or $20.3 per hour.

Mechanical Assembler

Rialto, CA • On-site

Winpak Ltd
1 - 5K employees
Learn more about Winpak Ltdexternal

$24 - $25/hr

Full-time

Medical, Dental, Vision, Life, Retirement

Re-posted 10 days ago

Winpak rating

6.8

Company rating: 6.8 out of 10

Based on 9 frontline employees who took The Breakroom Quiz

Job description

Winpak Lane is seeking a Mechanical Assembler to join our Assembly team in Rialto, California. You will build and align custom packaging machinery from blueprints, verify component quality, and help prepare equipment for successful shipment. This is a hands-on opportunity for a mechanically skilled professional who enjoys precision work, troubleshooting, and seeing complex equipment come together.
Key Responsibilities
  • Assemble complex packaging machinery and options from drawings, work instructions, and specifications.
  • Fit, align, adjust, and verify components within required tolerances; confirm final alignment before shipment.
  • Inspect starting materials and assembled parts, identify shortages or defects, and communicate issues promptly.
  • Install mechanical systems such as chains, pulleys, gearboxes, pneumatic components, regulators, and air lines.
  • Use hand and light power tools, calipers, micrometers, scales, and other measuring devices safely and accurately.
  • Troubleshoot build issues and partner with Engineering, Planning, Fabrication, and Production to resolve them.
  • Follow safety, personal protective equipment, 5S, and continuous-improvement requirements; maintain an organized work area.
  • Support training and increasingly complex machine builds based on demonstrated skill level.

Required Qualifications
  • High school diploma or equivalent.
  • 2+ year of mechanical assembly, industrial maintenance, field service, or related hands-on experience.
  • Ability to read blueprints, diagrams, manuals, and written work instructions.
  • Working knowledge of basic shop math and precision measuring tools.
  • Ability to lift up to 50 pounds unassisted, use ladders, work at heights up to 25 feet, and squat or sit for extended periods, with or without reasonable accommodation.

Preferred Qualifications
  • Trade-school training in mechanical assembly, machining, or a related technical field.
  • Experience with packaging machinery, pneumatics, tight-tolerance assembly, geometric dimensioning and tolerancing, or machine rebuilds.
  • Experience with material requirements planning software and basic computer transactions.

Level Placement
Placement from Level I through Senior is based on relevant experience and demonstrated capability. Higher levels require independent completion of increasingly complex W18, W25, W630, option, cup-machine, or rebuild work, along with technical leadership and training responsibilities.
Additional Details
  • Full-time, non-exempt position based 100% onsite in Rialto, California.
  • Schedule and shift will be confirmed during the recruitment process; overtime may be required based on business needs.
  • Travel is generally not required.
  • Work is performed in a manufacturing environment with noise, moving equipment, flying debris, temperature changes, and required personal protective equipment.

Compensation
Compensation range: $24.00- $25.00. Pay will be determined based on the candidate's experience, demonstrated skill level, and other job-related factors.
Why Winpak?
Winpak is committed to providing comprehensive benefits to support the physical, mental, financial and social well-being of our employees and their families. Our benefit package includes the following:
  • Medical, dental, vision & prescription coverage
  • Travel coverage
  • Disability coverage
  • Voluntary life insurance
  • Life and accidental death & dismemberment insurance
  • Tuition assistance program
  • Retirement savings plans
  • A comprehensive employee and family assistance program which includes short term counselling, wellbeing coaching, financial and legal consultations services.

Winpak's vision is to provide the best packaging solutions for people and planet. We are a leading supplier of innovative packaging solutions, known for providing high-quality products that meet the needs of a variety of industries, including food and beverage, pharmaceuticals, and consumer products. With a commitment to sustainability, safety, and excellence, Winpak continues to grow as a global leader in the packaging industry.
At Winpak, inclusion is one of our core values. We believe that an inclusive culture fosters a sense of belonging, drives innovation, and provides our brand a competitive advantage. Our goal is to create an environment free from harassment and discrimination, and where every individual feels respected, valued, and appreciated.
As an Equal Opportunity Employer, we are committed to an equitable and inclusive recruitment process, evaluating applicants based on merit, capability, and qualifications related to the job - never on identity factors such as race, color, gender, age, sexual orientation, religion, disability, national origin, or any other protected status. To support this commitment, if you require any accommodations during the recruitment process, please let us know and we will work with you to ensure your needs are met.
#INDWLI
Equal Opportunity Employer
This employer is required to notify all applicants of their rights pursuant to federal employment laws.
For further information, please review the Know Your Rights notice from the Department of Labor.

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