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Tension Proof Testers

Model 401 Tension Proof Tester

The Model 401 Tension Proof Tester can test lumber as large as a 2x6 (38x140 mm) with tensile loads up to 100,000 pounds (440 kN).

Model 403 Tension Proof Tester

Our most popular tension proof tester. The Model 403 tests lumber up to 2x12 in (38x286 mm) with tensile loads up to 100,000 lbs (440 kN). This machine can satisfy most of your tensile strength testing needs for structural lumber and composite materials.

  • Largest tension proof tester with the patented wedge grip
  • Flexible and easily changed gauge lengths.
  • Unlimited maximum specimen length
  • Provides tensile quality control in MSR lumber production, qualifying the product for tensile strength rating marks in its grade stamp
  • The Model 403 is our most popular tension proof tester for dimensional lumber.
  • Tension tests lumber up to 2x12 in (38x286 mm) with up to 100,000 pounds (440 kN) of tensile force
  • Patented wedge-grip clamps hold massive jaws which squeeze tight as the tensile force is increased
  • Clamps have open ends so the length of the tested board is only limited by space in the room.
  • Testing span from 1 ft (305 mm) to 12 ft (3660 mm) between the clamps.
  • Custom testing spans may be specified at the time of order
  • Set end clamp is easily moved by hand to increase or decrease gauge length
  • Test material is inserted on-edge from either end of the machine
  • Pneumatic closure system provides initial clamping force
  • Two frame-mounted hydraulic cylinders provide tensile load
  • Options are available for displaying the maximum load attained while the specimen is loaded to failure.

Models 412 & 422 Tension Proof Testers

Some customers demand more versatility and greater capacity—these two machines each deliver the ability to apply tensile force and clamp force independently.

  • Features separate hydraulic cylinder groups to clamp and apply tensile forces
  • Features the greatest capacity of Metriguard’s offline tension proof testers
  • Ensures conformance to tensile strength design values
  • Provides excellent quality control for MSR lumber production