T-Handle Comparisons

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T-Handle Comparisons

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

Wrench Size	Bondhus	Eklind	Allen
1/4 inch	869	781	756
7/32 inch	625	513	507
3/16 inch	387	336	319
5/32 inch	225	188	187
9/64 inch	158	135	131
1/8 inch	115	84	98
7/32 inch	77	59	63
3/32 inch	46	37	38

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
Shank Length - Handle Width / Diameter

MANUFACTURER

Wrench Size	Bondhus	Eklind	Allen
1/4 inch	5.8 - 4.1/0.7 (P/N 13312)	6.0 - 4.1/0.9	5.4 - 5.0/0.65
7/32 inch	5.3 - 4.1/0.7 (P/N 13311)	6.0 - 4.0/0.8	5.4 - 4.2/0.65
3/16 inch	4.8 - 4.1/0.65 (P/N 13310)	6.0 - 4.0/0.7	5.4 - 4.2/0.65
5/32 inch	4.6 - 3.1/0.5 (P/N 13309)	6.0 - 3.1/0.65	5.6 - 3.1/0.45
9/64 inch	4.3 - 3.1/0.7 (P/N 13308)	6.0 - 3.1/0.6	5.6 - 3.1/0.45
1/8 inch	4.0 - 3.1/0.5 (P/N 13307)	6.0 - 3.1/0.6	5.6 - 3.1/0.45
7/32 inch	3.8 - 3.1/0.5 (P/N 13306)	6.0 - 3.0/0.5	5.6 - 2.4/0.45
3/32 inch	3.5 - 3.1/0.5 (P/N 13305)	6.0 - 3.0/0.5	5.6 - 2.4/0.40

TEST METHODS:

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

Trial # Bondhus Eklind Allen

1 857 832 751

2 840 759 747

3 880 777 750

4 881 681 770

5 888 855 763

Average 869 781 756

7/32" Wrench size

1 624 521 506

2 598 518 506

3 631 520 511

4 630 504 511

5 641 503 503

Average 625 513 507

3/16" Wrench size

1 400 333 330

2 390 324 329

3 381 343 314

4 383 341 311

5 380 339 311

Average 387 336 319

5/32" Wrench size

1 221 190 193

2 224 188 184

3 234 189 189

4 223 183 186

5 221 188 184

Average 225 188 187

Mode of Failure:
Bondhus and Allen - the shank of the wrenches twisted into a spiral and then fractured.

Eklind - the wire handles deformed resulting in loss of contact with the torque fixture. Twisting and bending of the shanks also occurred during torquing, but no shank fractures occurred.

TEST DATA: (cont')
Torque to Break Wrench, in-lb.Mode of Failure (see below)

9/64" Wrench size

Trial #	Bondhus	Eklind	Allen
1	160	137	131
2	152	136	130
3	161	137	131
4	159	135	131
5	158	131	130
Average	158	135	131

1/8" Wrench size

1	105	89	97
2	114	85	101
3	118	82	94
4	114	82	99
5	119	82	101
Average	115	84	98

7/64" Wrench size

1	78	62	63
2	77	55	60
3	77	60	63
4	76	60	64
5	79	60	62
Average	77	59	63

3/32" Wrench size

1	46	38	40
2	45	37	37
3	46	37	37
4	45	36	38
5	46	37	37
Average	46	37	38

Mode of Failure:
Bondhus and Allen - the shank of the wrenches twisted into a spiral and then fractured.

Eklind - the wire handles deformed resulting in loss of contact with the torque fixture. Twisting and bending of the shanks also occurred during torquing, but no shank fractures occurred.

REMARKS:
The wrenches will be retained for thirty days then discarded unless otherwise notified.

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