The BT1-DL from Dakota NDT is an ultrasonic bolt tension monitor: it accurately measures bolt elongation, load, stress and strain, removing the uncertainties of the torque method through direct tension measurement.
- Direct tension measurement : elongation, load, stress, % strain
- Removes torque uncertainty : real clamp load measurement
- Temperature compensation : and transducer auto-correlation
- 1–10 MHz transducers : + glue-on version for short bolts
- Auto calibration : and field calibration (vector/regression)
- 4 GB memory : USB-C, PC and OSX software
- Industries : aerospace, energy, infrastructure, railways
The BT1-DL uses ultrasound to accurately measure bolt elongation and derive from it the time of flight (in nanoseconds), the load, the stress and the percentage of strain. This removes the problems typical of torque tightening, by measuring tension directly.
The auto-correlation functions assist transducer positioning, while auto-calibration and field calibration (vector or regression) ensure repeatable measurements. It offers 64 setups, alarms with adjustable thresholds, 4 GB of memory and USB-C connectivity with reporting software for PC and OSX.
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Technical characteristics
| Feature | Value |
| Instrument type | Ultrasonic bolt tension monitors |
| Measured quantities | Elongation, load, stress, percentage of strain, time (nanoseconds) |
| Timing | Precision TCXO; digitizer with adjustable resolution |
| Temperature compensation | Yes |
| Measuring mode | Pulse-Echo (single echo) |
| Transducers | Single element 1–10 MHz, diameters 1/8”–1”; glue-on version for short bolts |
| Functions | Auto Correlation (transducer positioning), Auto Set, auto-calibration, field calibration (vector or regression) |
| Setups | 64 customizable setups |
| Alarms | Adjustable high/low thresholds with LED and audible signal |
| Memory | 4 GB internal |
| Connectivity | USB-C; PC and OSX software |
| Keypad | 12-key membrane keypad |
| Operating temperature | −10 … +60 °C |
| Dimensions | 63.5 × 165 × 31.5 mm |
| Weight | approx. 383 g (13.5 oz, with batteries) |
| Housing | Extruded aluminum with nickel-plated aluminum end caps (sealed gaskets) |
Part numbers, accessories and spare parts
Part numbers for ordering the BT1-DL and its accessories. The part numbers will be added as soon as they are available.
Instrument – complete kit
| Part number | Product code | Description |
| — | BT1-DL | BT1-DL ultrasonic bolt tension monitor |
Accessories
Photo
Part number
Product code
Description
—
Bolt transducer
Single-element transducer (1–10 MHz, diameters 1/8”–1”); glue-on version for short bolts
—
Couplant
Coupling gel for ultrasound transmission
—
Carrying case
Carrying case for the instrument and its accessories
Technical documentation
| Document | Type |
| BT1-DL datasheet | Datasheet (PDF) |
| BT1-DL manual | Manual (PDF) |
Frequently asked questions
It measures bolt elongation and derives from it the load, stress, percentage of strain and time (in nanoseconds), for direct control of fastener tension.
Because it measures tension directly by ultrasound, removing the friction-related uncertainties typical of the torque method.
Single-element 1–10 MHz transducers with diameters from 1/8” to 1”; a glue-on version is available for short bolts.
Yes: 4 GB of internal memory, with download via USB-C and reporting software for PC and OSX.
Contacts & Information
Contact for general information : info@roder.it
Machine Vision Division of RODER : www.rodervision.com
RODER Instruments Division : www.innovacheck.com
More about RODER : about us
The information contained in this website is provided for information purposes only. Although it has been prepared with the greatest care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.
Note: Some images on this website have been intentionally generated using artificial intelligence (AI). This is because, for many applications and projects, photographs of the actual installation or system cannot be disclosed owing to confidentiality agreements, contractual clauses and non-disclosure agreements (NDAs).
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