SWPI | Precision Calibration Weights Manufacturer

About SWPI (Shanker Wire Products Industries)

Our story

At SWPI we are passionate about empowering businesses with innovative technology. Founded in the year 1961 seeing opportunities afforded by India’s having adopted the metric system in 1958. Our journey began with a simple idea: Providing accuracy in weighing systems throughout the world. Today, we are proud to be a trusted partner for calibration labs, pharmaceutical companies, industrial manufacturers, government agencies worldwide.

Our mission

Our mission is to provide accurate, reliable, and durable test weights that support global standards in calibration and measurement. We strive to bridge gaps in the industry by prioritizing innovation, integrity, and customer satisfaction.

Our Premium Products

Discover our comprehensive range of high-quality calibration weights and precision instruments

Test Weights Rectangular Shape

SWPI’s Model No. 187 Test Weights are manufactured in denominations from 500 kg to 1000 kg, making them highly reliable for the calibration of heavy-duty weighing machines. Constructed from high-quality pig iron with a smooth surface finish, these rectangular weights are easy to stack and ensure long-term calibration accuracy.

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Standard Weights (100 kg to 1000 kg)

Our Standard Weights are designed in both rectangular and cylindrical shapes, available in denominations from 100 kg to 1000 kg. These weights are commonly used for calibration of industrial weighing machines, weighbridges, and large-scale instruments. Manufactured from durable cast iron and coated for corrosion resistance, they provide dependable accuracy in industrial applications.

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Slotted Weights with Hanger

Our slotted weights with hanger are designed for easy stacking and accurate calibration in laboratory and industrial applications. Manufactured from premium materials, they ensure precision in weight testing and are available in a wide range of denominations from 100 g to 20 kg. Their hanger design makes them convenient for use in mechanical balances and other calibration setups.

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Roller Weights

Heavy-duty roller weights are built for applications requiring smooth movement and easy handling during calibration. With capacity options ranging from 200 kg to 500 kg, these weights are designed for rolling and lifting with minimal effort. Their rugged construction ensures long-term durability, making them suitable for demanding industrial environments.

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Cylindrical Weights Schengener States

These precision cylindrical weights, ranging from 100 g to 10 kg, are crafted in compliance with international standards. They are ideal for laboratory calibration, research institutions, and industries that demand highly accurate measurements. The cylindrical shape ensures stable placement, and the polished finish enhances both durability and performance.

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Test Weights Hexagonal Shape

Our test weights provide reliable calibration solutions for a variety of weighing instruments. Available in denominations from 100 g to 20 kg, they are engineered to deliver consistent accuracy for commercial, laboratory, and industrial use. Their robust construction ensures resistance to corrosion and wear, guaranteeing long-term performance.

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Bell Weights

Bell weights are designed with a traditional bell shape for easy handling and stacking. They are available in a wide range from 5 g to 500 g, making them suitable for precision calibration and trade verification. The durable finish ensures long-lasting usability while maintaining accurate weight standards.

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Proportional Weights

Our cast iron weights are manufactured with high-grade iron and are available in proportional ratios of 100:1 and 50:1. These weights are commonly used as counterpoise weights in platform scales and heavy-duty weighing machines. Finished with protective coating, they resist rust and corrosion, ensuring long-lasting performance even in rough environments.

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Avoirdupois Weights (1/4 lb to 56 lb)

SWPI Avoirdupois Weights are manufactured as per traditional British measurement standards. Available in denominations ranging from 1/4 lb to 56 lb, they are ideal for trade verification and calibration. Made from high-quality cast iron with smooth finishing, these weights ensure accurate and reliable performance in industrial and commercial use.

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Why Choose Us

Discover why SWPI has been a globally trusted name in precision weights and calibration solutions for more than 60 years.

60+ Years of Expertise

Since 1961, SWPI has been exclusively dedicated to designing and manufacturing precision test and standard weights. Our six decades of consistent innovation and craftsmanship make us one of the world’s most trusted providers of calibration solutions.

NABL Accredited Calibration

Our calibration laboratory is accredited by NABL under ISO/IEC 17025:2017, ensuring every weight is verified to meet stringent global standards. This accreditation guarantees traceability, reliability, and accuracy in all our calibration services.

International Standards Compliance

All our weights are manufactured in compliance with OIML R-111 and R-47 standards. By strictly following international metrology regulations, we ensure that every product meets global requirements for accuracy and consistency.

Precision Engineering & Recognition

Our attention to detail—from material quality and surface finish to dimensional accuracy—has earned us international recognition. SWPI’s contributions were acknowledged by OIML in 1973 for excellence in precision engineering.

Wide Product Range

We offer a comprehensive range of weights from 100 g to 1000 kg in diverse forms including hexagonal, rectangular, cylindrical, slotted, and roller weights. This versatility makes our products suitable for industries, calibration labs, and government institutions worldwide.

Global Reach & Trust

SWPI exports precision weights to over 42 countries including the USA, Germany, Australia, and the Middle East. Our global footprint is a testament to the reliability, trust, and credibility that customers across the world place in our products.

Respected by the Metrology Community

SWPI is not just a manufacturer but a contributor to the global metrology ecosystem. We have provided technical input to improve OIML guidelines (R-47 and R-52), and our work was recognized at the 44th CIML Meeting in Mombasa, 2009.

Diverse Industry Applications

Our products are trusted across sectors including research labs, industrial calibration centers, pharmaceutical companies, government departments, and educational institutions, ensuring accuracy in every critical application.

Commitment to Long-Term Quality

Every product undergoes rigorous inspection and quality checks to ensure lasting precision and durability. We remain committed to continuous improvement, adapting to new technologies while upholding traditional craftsmanship.