A-A-1297 Hammer, Hand, Trimmers', Tack, Magnetized

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A-A-1297

Test:

Handgrip Test. Hammers with handgrips shall be subjected to 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 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 G (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 hammerhead securely captured to restrict movement. In order to minimize normal forces to handle, the handgrip shall be captured using a woven wire cable grip or suitable device.

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) 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 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.

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.