Torque Wrenches / Torque & Tension Testing Equipment

Torque Wrenches

Torque wrenches are used in a variety of fastener tests such as:

  • Torsional strength testing of tapping screws
  • Drive torque testing thread rolling screws
  • Hydrogen embrittlement testing electroplated screws and
  • bolts
  • Prevailing torque, installation and removal torque, on
  • torque, on lock nuts and lock screws
  • Torque-tension testing tapping screws, lock nuts, lock
  • screws, and structural bolts

Greenslade torque wrenches meet the accuracy requirement of +/- 1 %. A general rule is that torque wrenches should not be used in the lower 20% of their maximum torque rating.

Torque wrenches are available with either an easy-to-read, large dial face with a memory needle or a digital display. The digital wrenches can be connected to the Greenslade data collectors for recording test results.

Dial Torque Wrenches:

TWI-030; 6-30 inch pounds TWI-075; 15-75 inch pounds TWI-300; 60-300 inch pounds TWF-025; 5-25 foot pounds TWF-050; 10-50 foot pounds TWF-100; 20-100 foot pounds TWF-150; 30-150 foot pounds TWF-250; 50-250 foot pounds TWF-600; 120-600 foot pounds TWF-1000; 200-1000 foot pounds

Tension Tester

Some fastener test specifications require that a bolt must achieve a given tension value when less than a maximum amount of torque is applied. When bolts are tightened in assemblies by applying torque they actually stretch and act like a spring to keep the components of the assembly firmly together. As a general rule, bolts should be tightened until their tension (stretching force) is about 50-60% of their minimum required tensile strength.

Tension cannot be determined with a torque wrench. The same amount of torque applied to bolts of the same size with different finishes will create entirely different tension forces. When tightening a bolt over 50% of the applied torque is used up in the under head friction. The only way to determine how much tension is created in a bolt is to test the bolts and nuts to be used in a Tension Tester. With this device plus a torque wrench, the Torque-tension relationship can be precisely determined. How much applied torque is required to generate a desired number of pounds of bolt tension can also be determined.

To test a bolt, it is inserted through the tester’s hydraulic load cell area and assembled into a nut. As the nut is tightened, the increasing bolt tension is shown on the tester’s pressure indicator.

TESTER MODEL S: Tooling: #6, #8, #10, 1/4 Tension capacity: 5,000 pounds TESTER MODEL J: Tooling: #10, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16 Tension capacity: 30,000 pounds TESTER MODEL RL: Tooling: 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4 Tension capacity: 110.000 pounds

Our company is taking all precautions during the COVID-19 coronavirus pandemic. We do remain OPEN for business and stand ready to serve you. We are limiting customer service interactions to PHONE and EMAIL. Although we are not promoting in person visits, we will be practicing non-contact package pick up and drop off, along with critical on-site calibration services as necessary.