Aluminum alloy, qq-a-327, temper t6 or ams4027, rockwell hardness rating rb 45 min, heat treated per mil-h-6088 per united aircraft specification no. Hs454, 01.26 in. Min. To 01.30 in. Max. O/a lg. 01.22 in. Min, 01.26 in. Max o/a w 45 degrees angle, 0.360 in. Min, 0.400 in. Max w