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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 |
| L-Wrench Comparisons |
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Project number 3018 99-05234 Date: January 29, 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 Testing INTRODUCTION: This report presents the results of comparison performance tests conducted on eight specified sizes of hex wrenches produced by three manufacturers. The testing was requested on January 4, 1999 by Mr. Mike Blackston of the Bondhus Corporation. The scope of work was limited to purchasing the hex wrenches directly from an industrial distributor, determining the torque to fracture (twist off) the wrenches and providing a report of the results. The testing was completed on January 27, 1998. SUMMARY OF RESULTS: Average Torque to Fracture (break) Off Wrench, in-lb MANUFACTURER
SAMPLE IDENTIFICATION: Ball-end style hex wrenches purchased from
MSC Industrial Supply Co. under Maxim Technologies purchase order number 51345
on 1-14-99 and shipped to our facility by UPS. Five (5) wrenches each in the
size and leg lengths listed below were purchased. SAMPLE IDENTIFICATION:
The size, leg lengths and end styles of
the wrenches purchased were documented. The torque testing was conducted by
placing the shorter leg of the wrench 3/16" into the matching size of a hex
driver socket. The hex socket was attached to a 2,000.0 in-lb torque transducer.
To obtain the required leverage to stress the wrench, an extension arm (pipe)
was placed over the longer leg to terminating 1 inch from 90° bend. The wrenches
were then torqued clockwise until the wrench fractured (broke) off. The
indicated maximum peak torque and location of break were documented for each
wrench. TEST EQUIPMENT: Lebow 2K 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 fracture (break) off wrench,
in-lb. 1/16" Wrench size
5/32" Wrench size
1/4" Wrench size
5/16" Wrench size
In all cases the wrenches broke at the start of the socket driver with permanent twisting of the shorted leg occurred prior to breaking. TEST DATA: (cont') Torque to fracture (break) off wrench,
in-lb.
4 mm Wrench size
6 mm Wrench size
8 mm Wrench size
In all cases the wrenches broke at the start of the socket driver with permanent twisting of the shorted leg occurred prior to breaking. REMARKS: The wrenches will be retained for thirty days than discarded. |