A-A-1284
Test:
Handgrip Test. Hammers with handgrips shall be subject to this test. Each’ sample shall be conditioned climatically to 30 degrees F, plus or minus 2 degrees F, and remain at this temperature for 1 hour or until 1 thermal stabilization has occurred. The sample shall then be cycled to plus 120 degrees F, plus or minus 2 degrees F, and remain at this temperature for 1 hour or until thermal stabilization has occurred. The sample shall then be conditioned to plus 70 degrees F, plus or minus 10 degrees F (room ambient temperature).
The pull test force is to be as noted below, except, that for certain sizes where the handgrip pull test force is found to be greater than the pull-apart force (tensile force). In this instance the handgrips shall be subjected to the head pull-apart force (tensile force) and a maximum in lieu of the specified force.
Grips which loosen or separate from the handle shall be cause for rejection.
After application of the pull test, the hammers shall be held by the head, and the grip twisted at the normal handgrip position by hand in alternating directions with a torque as noted in the Table below. Five complete twisting cycles shall be performed, after which there shall be no grip looseness or separation from the handle.
|
HAMMERED WEIGHT |
PULL TEST FORCE |
TORQUE TEST |
|
Less than 16 oz. |
500 lbs. |
40 in-lbs. |
|
16 oz. and over |
700 lbs. |
50 in-lbs. |
Crack Detection Test. All samples shall be 100 percent inspected and shall be subjected to either a wet magnetic - particle inspection test as described in ASTM E-709-80 or an Ultra scope detection test described in ASTM E-114.75. All surfaces shall be examined. Any hammer exhibiting surface crack indications in any location, may have that indication removed by minor rework. The lot shall be rejected if upon Government acceptance testing any crack indications are found.
Fiberglass Handle Overstrike Test. Hammers with fiberglass handles shall withstand twenty three full swinging overstrike blows by an average built man (160 to 180 pounds), commensurate with the end use and weight of the hammer. The blows shall be against that portion of the handle directly behind the head and on a substantially supported steel object having a minimum 3/8 inch full radius.
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