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Technical Library | Hex and TORX® Fasteners | Torque/Interchangeability
Competitor Comparisons

Torque Comparison

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

Wrench Size Bondhus Eklind Allen
1/16 inch 15 11 11
5/32 inch 225 190 160
1/4 inch 920 765 725
5/16 inch 1760 1525 1390
1.5 mm 12 10 9
4 mm 230 165 160
6 mm 760 650 610
8 mm 1710 1540  1440

 

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:

Manufacture: Size Length Size Length
Bondhus 1/16 1/2" x 3" 1.5 mm 1/2" x 3"
5/32 3/4" x 4" 4 mm 1" x 4"
1/4 1-1/4"x5" 6 mm 1-1/4"x5-1/2"
5/16 1-1/2" x 6" 8 mm 1-1/2" x 6"
Eklind Tool 1/16 1/2" x 3" 1.5 mm 1/2" x 3"
5/32 3/4" x 4" 4 mm 1" x 4"
1/4 1-1/4"x 5" 6 mm 1-1/4"x5-1/2"
5/16 1-1/2"x6" 8 mm 1-1/2"x6"
Allen 1/16  1/2" x 3" 1.5 mm 1/2" x 3"
5/32 3/4" x 4" 4 mm 1" x 4"
1/4 1-1/4" x 5" 6 mm 1-1/4"x5-1/2"
5/16 1-1/2" x 6" 8 mm 1-1/2" x 6"

 

TEST METHODS:

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

Trial # Bondhus Eklind Allen
1 16 11 10
2 15 11 10
3 16 12 12
4 15 10 11
5 15 11 11
Average 15 11 11

5/32" Wrench size

1 239 195 175
2 200 189 157
3 233 192 150
4 243 192 138
5 220 190 170
Average 225 190 160

1/4"Wrench size

1 922 789 724
2 910 764 720
3 950 754 731
4 902 754 724
5 927 761 719
Average 920 765 725

5/16"Wrench size

1 1,789 1,521 1,371
2 1,764 1,513 1,430
3 1,778 1,535 1,403
4 1,735 1,546 1,371
5 1,740 1,501 1,382
Average 1,760 1,525 1,390

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.

1.5 mm Wrench size

Trial # Bondhus Eklind Allen
1 11 10 9
2 12 9 10
3 12 11 10
4 12 11 9
5 13 10 9
Average 12 10 9

4 mm Wrench size

1 249 163 180
2 215 147 132
3 231 182 164
4 235 162 175
5 235 177 148
Average 230 165 160

6 mm Wrench size

1 786 653 621
2 750 642 584
3 742 656 613
4 758 640 607
5 752 650 617
Average 760 650 610

8 mm Wrench size

1 1,733 1,535 1,431
2 1,704 1,526 1,426
3 1,707 1,557 1,480
4 1,693 1,543 1,424
5 1,712 1,550 1,428
Average 1,710 1,540 1,440

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.

 

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