A-A-2539 Hammer, Hand, Bricklayers'This commercial item description covers forged steel hammers used for driving nails, hammering metal, breaking stone, and similar uses.

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A-A-2539A

Hammerhead 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.

In-process crack detection test. No hammer provided under this commercial item description shall exhibit any indication of cracks in the hammerhead. All hammerheads shall be 100 percent in-process inspected after heat treating, prior to finishing and assembly and subjected to either a bidirectional wet magnetic particle inspection test in accordance with ASTM E 709-00 or an Ultrasonic detection test in accordance with ASTM E 114-75. All surfaces shall be examined. If a hammerhead is found to have indicators of a crack, the manufacturer may grind or buff to eliminate this condition but must maintain the overall weight and dimensional requirements.

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 then 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 force test applied to the grip parallel to the longitudinal axis of the handle with the hammerhead securely captured to a 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 pull force test is to be as noted below, except that for certain sizes where handgrip pull force test 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 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 force test, the hammers shall be secured by the head, and the grip twisted at the normal handgrip position by both hands in alternating directions. Five alternating twisting motions shall be performed, after which there shall be no grip looseness or separation from the handle.

Full apart head/handle test. All samples shall be 100 percent inspected in accordance with ANSI B173.6.

Fiberglass handle overstrike test. Hammers with fiberglass handles shall withstand 23 full swinging overstrike blows by an average built person, 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.