Pendulum Impact Tester – IT 406, 542 and 800

The pendulum impact testers from Tinius Olsen are reliable and versatile machines designed to totally comply with the specifications defined in EN10045-2, ASTM E23, and ISO 148. At present, the Model IT406 and the Model IT542 are extensively recognized as the standards for the industry for impact testing.

The Model IT406 offers full testing versatility. Easy insertion of interchangeable striking bits in the pendulum head swiftly adapts the machine for either Izod or Charpy testing. A notch on the rear of the pendulum head allows optional tooling to be fixed for performing tension impact tests.

A safety lock holds the pendulum in its raised position and guarantees a vibration-free release when triggered. Once released, the pendulum swiftly reaches the impact velocity of 5.47 m/second (17.0 ft/second) and has a maximum available energy of 406 J (300 ft.lbf) to impact the sample.

The excellent design and construction of the Model IT406 guarantee maximum testing accuracy and repeatability. When the machine is correctly installed and leveled, total frictional and windage losses during the pendulum swing will not exceed 0.5% of the energy range. Direct indication of the energy absorbed by the broken sample is given by a mechanical pointer on a graduated scale. This scale can be supplied in ft.lbf, J or kg.m. For user-friendliness, a digital display can be fitted to the machine to offer more results on the test. It is suggested that this display be included at the time of order.

Tinius Olsen offers many options to make the operation of the impact tester easier – from a simple electric brake to halt the swinging pendulum, to an automatic motorized return, eliminating the necessity for any manual intervention other than releasing the pendulum. The digital display is added in this last option and offers the trigger to energize the motor, which stops the swinging pendulum at the ideal position and returns it to the latched starting point. The time from pendulum release to return takes place in just 10 seconds, which means over 400 tests per day can be achieved with minimal effort. Tinius Olsen can also provide a low blow fixture that allows Izod, Charpy, or tension impact tests to be performed at any of 55 velocity/energy levels from the maximum of 5.47 m/second (17.9 ft/second) down to 0.13 m/second (0.4 ft/second).

For high traffic areas, Tinius Olsen can supply a full enclosure for the machine so that the swinging hammer and fragmented specimens do not cause any issues. The enclosure is fully interlocked so that the machine cannot function unless all the guards are in place. Tinius Olsen can also supply a higher capacity model, the Model IT542, which shares all the same characteristics as the IT406 but has an available energy of 542 J (400 ft.lbf). The IT542 is also supplied complete with the motorized return, electric brake, and digital display.

The range of capacities has been raised further with the Model IT800 offering 800J of available energy. This machine adds several unique features including a follower arm that tracks the swinging pendulum without contact and, if the test area safety doors are opened (or optional light curtain broken), instantly stops any additional motion of the pendulum. This follower arm also serves as the pendulum return carrier and safely returns the pendulum to its latched release point once a test is done. Other features include a touchscreen display to organize the test and display the results.

Horizon Software

  • User-selected reporting and exporting formats
  • Integral SPC programs for X-bar, R and frequency distribution chart/histograms
  • Test mode allows configuring, running, and saving of tests and results
  • Recall mode allows viewing of formerly saved results and performs database maintenance


Pendulum capacity J 406 542 800 300 400 590
Drop height m 1.5 1.5 1.5
ft 5 5 5
Pendulum weight kg 27 36 62
lb 60 80 136
Impact velocity m/s 5.5 5.5 5.5
ft/s 18 18 18
Dimensions* (WxDxH) mm 2108 x 508 x 1854 2108 x 508 x 1854 2560 x 910 x 2320
in 83 x 20 x 73 83 x 20 x 73 101 x 36 x 92
Weight kg 736 785 2631
lb 1620 1730 5800

*Width includes total swing clearance.
Specifications are subject to change without notice

Key Features

  • Precision, friction compensated, sturdy test frames
  • Digital display option allows test arrangement and result display
  • Safety features ensure repetitive secure testing
  • Digital display option allows simple connection to PC for full test SPC analysis



Replaceable shrouds prevent the specimen from rebounding against the pendulum. The striker is bolted to the pendulum and available in 8 mm (ASTM E23) or 2 mm (BS, JIS, EN, DIN, and ISO) nose radius sizes. An optional set of self-centering tongs is practical for accurately centering specimens, particularly those exposed to temperature extremes before the test.


The Izod striker is easily secured in the pendulum while the specimen is clamped in the close clearance slots in the vise. This guarantees the specimen has the precise vertical alignment while the setting gage guarantees the specimen is at correct height. A wrench is added for tightening and loosening the specimen in the vise. The Model IT800 does not have this configuration.

Tension Impact

The tension impact specimen is threaded into the specimen holder located in the pendulum head. Tension is instantly applied to the specimen when the holding bar strikes the anvils. This technique of support offers even distribution of the impact energy over the cross-section of the test specimen. The Model IT800 does not have this configuration.

Tinius Olsen's Pendulum Impact Tester – IT 406, 542 and 800

Tinius Olsen's Pendulum Impact Tester – IT 406, 542 and 800
Horizon software screenshots showing impact-related screens.
Model IT406. Shown with analog display.
Model IT542. Shown with digital display.
Model IT542, CE enclosed version. Features electric brake and motorised pendulum return.
The specimen rests horizontally on the Charpy supports. Centering tongs can be seen in front.
The specimen is clamped vertically at one end, using the front screw/vise. Left: The striker.
The specimen is threaded into the striker (left) and the holding bar at the rear of the pendulum head.

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