SI Onboard, an industry leader, manufactures on-board weighing systems for forestry, waste management, aircraft, and aggregate markets, with a strong reputation for quality, reliability, and service. The company continues to innovate, serving customers globally through a vast dealer network and sales/service branches.


Who We Are

SI (Structural Instrumentation) was formed in the late 1960’s, and pioneered the on-board scale industry while simultaneously shaping the on-board weighing market. Later on, SI acquired four more companies: Lodec, Evergreen Weigh, Allegany and Revere. These acquisitions expanded the SI product line (aircraft scales, bucket loader scales and lift truck scales) and positioned SI as a top load cell producer having Revere’s leading technology. Dominant in the U.S. and Canada early on, SI Onboard quickly expanded to relevance in Central and South America, and has far-reaching brand recognition in Asia. Synonymous with quality, reliability, and service, SI Onboard stands firm as a recognized market leader. We continue to innovate and develop new products to satisfy the ever-evolving needs of our valued customers

SI Onboard has established an extensive dealer network throughout the world that sells and services its products. In North America, we have sales and service branches in Norwood, MA, City of Industry, CA and Kelowna, Canada.

Forestry market


On-Board Weighing Solutions for the forestry and logging industry


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Solutions for transfer vehicles, or front, rear and side loaders


Aggregate category for SI Onboard


Dump trucks, front loaders and concrete weighing solutions


Aircraft solutions by SI Onboard


Dump trucks, front loaders and concrete weighing solutions


We rely on our SI On-Board Scales every trip to ensure that we maximize our loads.

Jake ThompsonTTT Timber, Inc.

We use SI On-Board Scales on our fleet of log trucks. Whether our trucks are running off road in harsh conditions or over the highway, the SI scales consistently provide accurate readings. We rely on our SI scales every trip to ensure that we maximize our loads. The majority of our haul routes pay by the ton so it is critical for us to maximize our revenue. Our SI On-Board Scales are very accurate, and our confidence in them has been proven through years of use. We have been pleased with how easy the scales are to use and adjust, and with their longevity in rugged conditions.