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inch |
①,Edge of head may be rounded or flat. ②,● Type AB thread-forming , see table [Table 40] ◆ Type A thread-forming, see table [Table 42] ▲ Type B and BP thread forming, see table [Table 41]; Type BF and BT thread cutting, see table [Table 43] ■ Type C thread forming, see table [Table VI-1]; Type D, F, G and T thread cutting, see table [Table 44]; and Type TRS thread-rolling ,see table [Table 45] ③,Screws of these lengths and shorter shall have undercut heads. For tapping screws, use Type AB undercut head screws in place of Type A screws for these lengths and shorter. |