Mini Max Ultrasonic Bolt Tension Monitor-HyTools

Mini Max Ultrasonic Bolt Tension Monitor

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Ultrasonically measures the elongation produced by tightening a threaded fastener.



13.5 ounces (with batteries).


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).


Membrane switch with twelve tactile keys.


Extruded aluminum body with nickel plated aluminum end caps (gasket sealed).

Data Output:

Bi-directional RS232 serial port; Windows® PC interface software.


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).


Square wave pulser with adjustable pulse width (spike, thin, wide).


Manual or AGC gain control with 40dB range.


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.



From 1 to 96 inches (25.4 to 244 cm).

Quantities: 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.


+/- 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.


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-Magnet- ic options.

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

Locking quick disconnect “00” LEMOconnectors. Standard 10 foot cable.

Custom transducers available for special applications.

Temperature probe for automatic temperature compensation.



64 custom user defined setups; Factory set- ups can also be edited by the user.


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