810 Minnesota Shear Tester


  • Internal bond testing of small specimens by equal compression and shear forces
  • Provides consistent measurement accuracy
  • Features full-face engagement of gripping surfaces
  • Complies with ASTM D 1037 standard
  • Capable of testing wet or dry specimens
  • Needs no special preparation of specimens

The Metriguard Model 810 Minnesota Shear Tester is comprised of two stainless steel loading heads. One head has a spherical bearing for firm, uniform contact with a specimen. The other head includes a spring-loaded linear roller bearing to allow lateral motion as a specimen undergoes shear deflection. Serrated mating surfaces and restraining bars (stop blocks) prevent specimen faces from moving with respect to the loading head surfaces while load is applied.

  • Attractive alternative to traditional internal bond strength measurement. With no time-consuming gluing or clamping, testing of either wet or dry specimens is quick and easy. The test is applicable to particleboard, oriented strand board (OSB), medium density fiberboard and waferboard as well as other types of panel products such as plywood and woodcement board.
  • Applies a load at a 45° angle to the face of a rectangular specimen, producing equal compression and shear forces.
  • Load at which a specimen fails (shears) is recorded by means of a suitable force measurement system, such as the Metriguard 831 Load Cell Display (not included). Recorded load is a measure of specimen internal strength.
  • First loading head attaches to the loading apparatus of a testing machine or press (not included). The second loading head includes a low-friction linear roller bearing which allows unrestrained lateral movement to occur as shear strain develops.
  • Improves upon earlier configurations of the Minnesota Shear Tester by offering simplified and improved loading heads to ensure uniform loading stress.
  • Tests by the Natural Resources Research Institute (NRRI) of Duluth, Minnesota, have shown excellent panel-average basis correlations between the compression-shear test performed by the Model 810 and traditional tension strength perpendicular to surface (internal bond) tests.
  • Manufactured and sold by Metriguard, Inc., under license from the University of Minnesota.
  • An optional bench-top testing apparatus allows the tester to remain ready for use at all times and includes a 10,000-lb (44 kN) capacity press, a load cell, and an electronic force readout unit.

Specimen Thickness Range

1/4 to 1-1/4 in (6.35 to 32mm). Test specimens are cut to dimensions specified in ASTM D 1037

Shipping Dimensions

L x W x H

12 x 7 x 5 in (300 x 170 x 120 mm)


20 lbs (9 kg)


Force Measurement System

Model 831 electronic unit Load cell: 10,000 lb (44kN) capacity Digital panel meter Shunt calibration

Test Frame

Built to house a bottle jack and the load cell for the electronic force measurement system