PRECISION YOU CAN SEE,

QUALITY YOU CAN TRUST.

CUSTOM INDUSTRIAL MANUFACTURING SOLUTIONS | NATIONWIDE

INDUSTRY-LEADING COMPONENT PRODUCER

Welcome to Electro-Seal, a proud sister company of Northern Indiana Manufacturing with a legacy that dates back to 1946. Specializing in fused glass-to-metal products, we lead the industry in producing hermetically sealed sight glasses and alternator pulley components. As an original equipment manufacturer (OEM) and contract manufacturer, we are committed to delivering top-quality solutions tailored to your needs. Explore our offerings and discover how we can help enhance your operations with precision-engineered components designed for durability and performance.

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innovative products that power your operations

Discover our range of precision-engineered products, including sight glasses, pulleys, and custom components designed to meet the diverse needs of various industries. Explore our solutions today and elevate your operations with quality you can trust!

SIGHT GLASSES
PULLEYS
MACHINING SERVICES
SPECIALITY COMPONENTS
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quality manufacturing in the USA SINCE 1946

Starting as Northern Indiana Screw Machine Products in 1946, our company established itself as a leader in precision screw machine parts for the automotive and heavy machinery industries. We changed our company name to Northern Indiana Manufacturing (NIM) in 1982 after Robert Dragani bought it, and in 1987 we significantly increased our capacity by introducing CNC lathes, which allowed for small lot runs and quick prototyping. Today, we proudly serve a diverse customer base, supplying over 375 aftermarket alternator pulleys and a wide range of specialty components.


Key Milestones:

  • 1946: Established as Northern Indiana Screw Machine Products
  • 1982: Acquired and rebranded as Northern Indiana Manufacturing
  • 1987: Expanded operations with CNC lathes
  • 1991: Acquired Electro-Seal Corporation, enhancing our product offerings
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OUR COMMITMENT TO QUALITY PRODUCTS

We ensure excellence through every stage of production, creating reliable, high-value products. Explore how our rigorous quality policy supports your success! Quality is at the Foundation of all our products and services.

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safety focused

We prioritize a safe environment to protect our team and ensure quality at every step.

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Organized HOUSEKEEPING

We operate with meticulous organization to enhance productivity and consistency.

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QUALITY ASSURANCE

Rigorous quality checks guarantee that each product meets our high standards.

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CONtinuous IMPROVEMENT

Through ongoing refinement, we find better ways to serve our customers.

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productive excellence

We aim for maximum productivity without sacrificing attention to detail or quality.

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Consistent Accuracy

Our products are crafted to exact specifications for reliable performance.

THE ULTIMATE CHOICE IN

PRECISION-ENGINEERED PULLEYS

We produce over 375 distinct variations of automotive belt drive pulleys, establishing us as a dominant source for aftermarket pulleys in the USA. Our extensive product line can accommodate most inventory needs. If a standard SKU is not available, our team is ready to collaborate on producing specialty solutions tailored to your applications. Contact us today to discuss your pulley requirements!


Our pulleys are compatible with major brands!

  • Delco
  • Paris Phone
  • Nippondenzo
  • Bosch
  • Ford
  • GM
  • Toyota
  • ...and more!
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our contract manufacturing CAPABILITIES

At our custom machine shop, we offer unique contract manufacturing capabilities with over 29 screw machines and 17 CNC lathes, producing custom parts for some of the world’s largest companies. Beyond small parts, our 6 and 8-spindle machines can create components up to 4 feet in length, making us competitive for medium-sized runs. Our expertise allows us to deliver a diverse range of specialty components, including hermetically sealed glass-to-metal fused sight glasses, electrical terminals, feed-throughs, pulleys, pins, and bushings tailored to customer specifications. Contact us today to discuss your custom part needs and experience the advantages of partnering with us!

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LEADING PRODUCER OF

FUSED GLASS-TO-METAL OBSERVATION TOOLS

Electro-Seal stands as North America’s leading producer of hermetically sealed sight glasses, offering both high- and low-pressure solutions across industries such as food, dairy, pharmaceutical, petroleum, and more. Our products enable precise observation of fluids, gases, and powders in critical environments—from ocean depths to outer space. We design and manufacture specialty solutions in-house, delivering reliability and value with cost-effective scalability for your project. Contact us today!

  • Stainless steel
  • Brass
  • Plated steel
  • Bare steel
  • Plastic
  • Other specified materials
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INDUSTRIES WE PROUDLY SERVE

Our capabilities in producing high-quality pulleys, sight glasses, and custom machined parts make us a valuable partner across multiple sectors. Discover how we can deliver precision and reliability to your industry needs today.

AUTOMOTIVE
Aerospace
Oil and Gas
Pharmaceuticals
Food and Beverage
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FREQUENTLY ASKED QUESTIONS

Our most common inquiries are answered below.

  • Why is Electro-Seal so popular?

    Electro-Seal has earned its reputation as the industry leader in fused glass-to-metal products, being a trusted provider since 1946. Our innovative approach to business has allowed us to become the go-to manufacturer of hermetically sealed sight glasses in North America. Offering solutions tailored to high- and low-pressure applications, we cater to a diverse array of industries. Discover why our products are integral to critical observations worldwide today. Contact us to learn more!

  • What industries benefit from your products?

    Our hermetically sealed sight glasses and electrical components are integral to sectors such as:


    Food

    Dairy

    Beverage

    Construction

    Pharmaceutical

    Petroleum

    Chemical

    ...and more!

  • Can you create custom solutions for specific applications?

    Absolutely! At Electro-Seal, we specialize in creating custom solutions tailored to your specific requirements. If your application demands a unique approach, our expert team is ready to design and fabricate components that meet your exact specifications.

  • How do you maintain cost advantages for customers?

    Electro-Seal maintains cost advantages through efficient production methods and economies of scale. Our extensive use of multi-spindle machines and CNC technologies allows us to minimize waste and maximize output. By optimizing our manufacturing processes, we offer competitive pricing without compromising on quality. Whether you're looking for medium-sized runs or intricate components, we provide cost-effective solutions tailored to your needs.

  • What manufacturing capabilities does your company have?

    We utilize advanced machinery, including over 29 screw machines and 17 CNC lathes, to produce high-quality components efficiently and competitively.

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Electro-Seal