A-A-1293A
Testing:
Hammer/head alignment. The angle of the handle shall be no more than 2 degrees from the perpendicular when measured from the longitudinal centerline of the handle to a plane parallel to the top of the head.
In addition, the rotational variance around the longitudinal centerline of the handle shall be no more than 2 “degrees when viewed from the butt end of the handle along the longitudinal centerline of the handle and when measured from the longitudinal centerline of the head to a line corresponding to the long dimension of the butt end of the handle.
Crack detection test. No hammer provided under this commercial item description shall exhibit any indication of cracks in the hammer head. All hammer heads shall be 100 percent in-process inspected after heat treating, prior to finishing and assembly and subjected to either a wet magnetic particle inspection test in accordance with ASTM E 709-80 or an Ultrasonic detection test in accordance with ASTM E114.75. All surfaces shall be examined. Any hammer head exhibiting indications of cracks shall be rejected. Hammer heads with only surface crack indications may have the indications removed by minor rework and the retested as above.
Handgrip test. Hammers with handgrips shall be subjected 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 thermal stabilization has occurred. The sample shall be cycled to plus 120 degrees F, plus or minus 2 degrees, 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 samples shall then be subjected to a pull test force applied to the grip parallel to the longitudinal axis of the handle with the hammer head securely captured to restrict movement. In order to minimize normal forces to the handle, the handgrip shall be captured using a woven wire cable grip or suitable device.
The test pull 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 (tension force) as maximum in lieu of the specified force. Grips which loosen or separate from the handle shall be cause for rejection.
|
Hammer Head Weight |
Pull Test Force |
Torque Test |
|
Less than 16 oz. |
500 lbs. |
40 in-lbs. |
|
16 oz. and over |
700 lbs. |
50 in-lbs. |
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 below. Five complete twisting cycles shall be performed, after which there shall be no grip looseness or separation from the handle.
Pull apart head/handle test. Each sample hammer shall be subjected to the tensile force test of ANSI B173.3.
The following NSN’s shall meet the testing requirements of overstrike test and the bending moment test:
5120-00-900-6118
5120-00-900-6095
5120-00-900-6096
5120-00-900-6097
5120-00-900-6098
Fiberglass handle overstrike test. Hammers with fiberglass handles shall withstand 23 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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