Millbolt Meter

Millbolt Meter 1
Millbolt Meter 2
Millbolt Meter 3

Ultrasonically measures the actual elongation produced by tightening a threaded fastener.

  • The most advanced ultrasonic solution available on the market.
  • EFFECTIVELY monitor your bolts during periodic shutdowns over the service life of the fastener.
  • VISUALLY compare the unloaded to the loaded waveform.
  • MEASUREMENT QUANTITIES – Time (nanoseconds), Elongation, Load, Stress and 5 Strain.
  • DISPLAY OPTIONS – RF, Rectified, Large Digits with Limits Bar.
  • DISPLAY RESOLUTION – 1/8 inch VGA 240 pixels x 160 pixels.
  • STORES 8000 readings and waveforms in multiple groups.
  • BUILT-IN linear regression or vector for optimising load measurements.
  • AUTO SET feature automatically optimises detection and adjusts display.
  • HI / LO ALARM tolerance limits work in conjunction with the data
Millbolt meter



Weight: 13.5 ounces (with batteries).
Size: Width (2.5 in/63.5 mm)
Height (6.5 in/165 mm)
Depth (1.24 in/31.5 mm)
Operating Temperature: -14˚ to 140˚F (-10˚ to 60˚C).
Keyboard: Membrane switch with twelve tactile keys.
Case: E, xtruded aluminum body with nickel plated aluminum end caps (gasket sealed).
Data Output: Bi-directional RS232 serial port; Windows® PC interface software.
Display: 1/8in VGA grayscale display (240 x 160 pixels); viewable area 2.4 x 1.8in (62 x 45.7mm); EL backlit (on/off/auto invert).

Ultrasonic Specifications

Measurement Modes: Pulse-Echo (flaws, pits).
Pulse-Echo w/Gate (fine adjust).
Pulser: Square wave pulser with adjustable pulse width (spike, thin, wide).
Receiver: Manual or AGC gain control with 40dB range.
Timing: 10 bit 250 MHz digitizer.


Transducer Types: Dual Element (1 to 10 MHz).
Locking quick disconnect “00” LEMO connectors. Standard 4 foot cable.
Custom transducers and cable lengths available for special applications.


Range: From 1 to 96 inches (25.4 to 244 cm).
Time Nanoseconds.
Elongation Change in length (inches/mil-limeters).
Load Force load applied (pounds KIP or megapascals MPa).
Stress Force for unit area stress applied (inches per inch or millimeters per millime- ter).
%Strain Ratio of elongation to effective length.
Resolution: +/- 0.00001 inch (0.0001 mm).
Velocity Range: 0.0492 to .3937 inches/microsecond (in/μs) (1250 to 9,999 meters/sec). Fixed, Single, and Two-point zero calibra- tion options. Select bolt material types from a preset or custom list.
Units: English & Metric / Farenheit & Centigrade.


A-Scan: Rectified +/- (half wave view), or RF (full waveform view).
Large Digits: Display and toggle between nanoseconds, elongation, load, stress, and strain; Digit Height: 0.400 inch (10mm).
Limits Bar (alarm limits): Set Hi & Lo alarm limits for displaying an acceptable toler- ance range.
Repeatability Bar Graph: Bar graph indi- cates stability of measurement.

Data Logger

Total of 8,000 bolts in multiple bolt groups. Stores both waveform views, nanoseconds, elongation, load, stress, strain and all gauge settings for each reading.
Memory: 16 megabit non-volatile ram.


Transducer types:
Single element (1 MHz to 10 MHz & 1/8 to 1inch diameters). Magnetic & Non-Magnetic options.

Glue-on transducers available for short bolts with minimal elongations to eliminate transducer placement errors.

Locking quick disconnect “00” LEMO connectors. Standard 10 foot cable.

Custom transducers available for special applications.

Temperature probe for automatic temperature compensation.


Setups: 64 custom user defined setups; Factory set- ups can also be edited by the user.
Gate: Gate used to fine adjust where the detec- tion point occurs.
Alarm Limits: Set Hi and Lo tolerances with audible beeper, viewable scan bar, and visual LEDs.
Auto Set: Locates the detection signal, optimizes the gain setting, and adjusts the overall display to show the waveform and detec- tion point automatically.
Field Calibration: Vector & linear regression.


Factory calibration traceable to NIST & MIL- STD-45662A.


2 year limited.