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Overview |
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Hex and Star Fasteners |
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Torque Calculation |
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Torque and Screw Interchangeability |
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Torque Comparison |
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2mm Strength Demo |
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T-Handle Comparisons |
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L-Wrench Comparisons |
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Salt Spray Comparisons |
| T-Handle Comparisons |
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Project number 3018 99-07600 Date: March 3, 1999 MAXIM TECHNOLOGIES, INC. 662 Cromwell Avenue St. Paul, Minnesota 55114 Project: Torque Testing Client Purchase Order Number: Verbal Prepared By: Scott W. Britzius Project Engineer/Experimental Mechanics Mechanical Engineering Department Reviewed By: Richard S. Alberg Manager Mechanical Engineering Department Phone: (651) 659-7307 "An Affirmative Action, Equal Opportunity Employer" The test results contained in this report pertain only to the samples submitted for testing and not necessarily to all similar products. Comparison Performance Torque Testing INTRODUCTION: This report presents the results of comparison performance tests conducted on T-Handle Hex wrenches produced by three manufacturers. The testing was requested on March 3, 1999 by Mr Mike Blackston of the Bondhus Corporation. The scope of work was limited to purchasing the two competitor brand of wrenches directly from an industrial distributor. Determining the torque required to fracture (break) the three manufacturers wrenches and to provide a report of the results. SUMMARY OF RESULTS: Average Torque to Fracture (break) Off Wrench, in-lb MANUFACTURER
SAMPLE IDENTIFICATION: T-Handle style Hex Wrenches. The Bondhus wrenches were submitted
on 3-4-99. Maxim Technologies purchased from MSC Industrial Supply Company, five (5) wrench sets
of: ALLEN -Cushion Grip P/N 75043513 and EKLIND - Wire Form P/N 05044516 under our Purchase Order
number 52205 dated 3-10-99. The wrenches were received at our facility via UPS on 3-12-99. The wrench sizes,
shank length and T-handle dimensions are listed on the following page.
Wrench Dimensions, inches
MANUFACTURER
The size, shank length, handle width and
diameter of the wrenches were documented. The torque testing was conducted by
placing the shank of the wrench into the matching size of a hex driver socket
attached to a 2,000 in-lb torque transducer. The handle of the wrenches were
rotated in the clockwise direction using a fixture (see drawing on page 6)
designed to contact the handle with two (2), 3/8" diameters on opposite sides,
at the span of; 2" for the 5/23" - 3/32" wrenches and 2-1/2" for the 1/4" -
3/16" wrenches. The wrenches were torqued until either the shank fractured
(broke), spun loose in the handle or handle deformation caused loss of contact
with the torque fixture. The indicated maximum peak torque and mode of break
were documented for the wrenches. TEST EQUIPMENT: Lebow 2000.0 in-lb torque transducer, MTI# MM 120-002, calibrated traceable to the NIST on 2-3-98 due 2-3-00. TEST DATA: Torque to Break Wrench, in-lb. Mode of Failure (see below) 1/4" Wrench size
7/32" Wrench size
3/16" Wrench size
5/32" Wrench size
Mode of Failure: TEST DATA:
(cont') 9/64" Wrench size
1/8" Wrench size
7/64" Wrench
size
3/32" Wrench size
Mode of Failure: |