- In-house engineering and production
- Short lead times
- Worldwide delivery
- More than 20 years of experience
BoltSafe as an alternative to Skidmore-Wilhelm bolt testers
Skidmore-Wilhelm bolt testers are very commonly used in the market since the 1950’s, but BoltSafe load cells use a different kind of technology. Our sensors measure the changes in the magnetic field using magnetoelastic technology. This causes BoltSafe load cells to be very compact. They are specially designed to measure and monitor bolt load in bolted joints. The load cells can be used as well during assembly (for calibration and testing), as over time (mounted in a bolted construction). Using our sensors enhances safety, makes joints more dependable and secures control over bolted connections.
The difference with a Skidmore-Wilhelm bolt tester, is that they are used as washers. They are placed on the non-driven side of a bolted connection, preferably under a nut. While the bolt is being tightened, the applied force results in a minor deformation of the BoltSafe washer. The sensor measures the changes in electrical resistance caused by these deformations. This is the data we use to determine the bolt load and tension at any given moment.
Bolt load sensors
BoltSafe bolt load cells are specially designed to monitor the bolt load in bolted joints. Knowing this information enhances safety, makes joints more dependable and results in better control over bolted constructions.
Readout methods
BoltSafe bolt load cells can send their data to different readout methods. We offer the following: the Handheld Reader, Network with PDI, Network with PDI-NT, RS-232 and Analog Converter and the IoT-node.
Bolt load sensors
BoltSafe bolt load cells are specially designed to monitor the bolt load in bolted joints. Knowing this information enhances safety, makes joints more dependable and results in better control over bolted constructions.
Readout methods
BoltSafe bolt load cells can send their data to different readout methods. We offer the following: the Handheld Reader, Network with PDI, Network with PDI-NT, RS-232 and Analog Converter and the IoT-node.
What is a Skidmore bolt tester?
Skidmore-Wilhelm was founded 70 years ago as a contract manufacturer and machine shop. Soon after, they were asked to invent a device that would measure the tension in a bolt. Use of bolts in steel structures was exploding and engineers were trying to understand the relationship of torque and tension in that bolted joint. Skidmore-Wilhelm bolt testers are used for fastener testing to determine torque/tension relationships. They can be used in steel buildings, bridges and other structures using fasteners in tension critical joints.
Contact us for more information or to order our load sensors
Why choose a BoltSafe sensor instead of a Skidmore-Wilhelm bolt test?
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BoltSafe sensors can be used as well during calibration of tools, as over time to monitor bolt load and tension.
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Calibration is done inside the load cell, so there is no calibration needed at the side of the readout equipment, not even when switching between readout methods.
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They can withstand very low and high loads from 18 kN to 3000 kN.
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The bolt load is measured across the entire surface of the ring.
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Our load sensors send out only digital signals, are dust free and water resistant meeting the IP66 rating.
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BoltSafe sensors are drift free and have almost no creep effect. We assure a maximum deviation of 1% of the full scale after factory calibration.
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We offer different types of readout methods to suit various wishes and situations.
Are you interested in using or distributing our bolt load sensors as an alternative to Skidmore-Wilhelm bolt testers? Please contact us through info@boltsafe.com or call us at +31246790797. If you have any questions about the functionality, usability or applicability of our products, do not hesitate to contact us.