Engineering Design and Fabrication Services

Engineering design services
Engineering Design Services
  • Product development engineering 
  • Engineering part design, assembly design, system design, machine design, CAD modeling, fabrication drawings
  • Prototypes or design for high volume manufacturing 
  • Design of machined, welded, brazed, bonded, fastened, extruded, sheet metal and injection molded components
  • Heat transfer equipment including cold plates and heat exchangers, manufacturing stations, industrial automation
  • Coordination and partnerships with electrical engineering firms for design of printed circuit boards, cables, human-machine interfaces and complete electro-mechanical systems
Engineered Systems Fabrication and Testing
Engineered Systems Fabrication and Testing
  • Part procurement and inspection through strategic relationships with machine and fabrication shops

  • Subsystem and component assembly

  • Part, assembly, and system acceptance and characterization testing

  • Design of test fixtures for simple and quick manufacturing tests or high-precision / high-value instruments.  We have designed test fixtures capable of repeatably measuring to 0.0002 inches.  

Mechanical Engineering Analysis Services
  • Structural analysis, stress analysis, structural Finite Element Analysis (FEA) 
  • Thermal analysis, thermal FEA, Conduction analysis, convection analysis
  • Computational Fluid Dynamics (CFD),  Fluid flow and pressure drop modeling 
  • Thermal performance modeling, system modeling
  • Electronics cooling and thermal management. Single phase cold plate design, Two-phase cold plate design,  heat exchanger design,
project management
Project Management and Project Engineering
  • Project management and coordination of technical team including mechanical and electrical engineers, drafters and technicians. 

  • Project schedule and budget implementation and maintenance.   Proper project management ensures projects are completed on time and on budget. 

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Spokane Engineering

Product development DesigN and Fabrication

Johnston engineering is the region’s best product development engineering company.  We design your product, device or system and numerically simulate how it will perform before parts are ever manufactured. Integrating design and analysis ensures the quickest product development cycle and least number of prototype iterations which saves our customers time and money.  We fabricate and deliver your product in a timely manner and at a competitive price. 

We serve a broad range of clients in the biomedical, renewable energy, consumer product, pumped fluid systems, HVAC, thermal management, manufacturing, food handling equipment, firearms and energy storage fields.

We handle all phases of the design cycle from concept to finished product.  We will manage your project design, schedule, budget, fabrication and test.  We partner with local electrical engineers for circuit board design and software development for integrated electrical-mechanical devices.  

Our core analysis competencies include system engineering of fluid flow systems, thermodynamics, heat transfer, and component and assembly structural analysis using the latest Finite Element Analysis and Computational Fluid Dynamics design packages.

Recent Engineering Projects


13 Coins Restaurant

13 Coins 13 Coins is a timeless Seattle institution where generations have settled in for an unforgettable experience since 1967. Famed for its high backed booths, swiveling captain’s chairs and an …
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Stop Box

Johnston Engineering assumed the responsibility of handling the complete full design of parts, assembly and structural analysis. Working with and vetting out various vendors, Johnston Engineering was …
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Dew Point

Johnston Engineering has had the privilege to work with Dew Point. Dew Point provides a cost-effective, sustainable and eco-friendly solution to the world’s growing water shortage. Dew Point takes p…
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Recent publications, awards, and events

Best Engineering Firm Spokane

Best engineering firm in spokane

We are excited and proud to earn Bronze for “Best Engineering Firm” in the Spokane Coeur d’Alene Living Magazine Best in B2B awards. Perhaps the best part is that we don’t even com…
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120 North Stevens Ave Suite 200 
Spokane, WA 99201


Phone: 509.290.1034