Machine Tap Tap Style Straight Flute (Hand) Tap Dimension Type Inch Tap Thread Size 5/16 In.-18 Tap Chamfer Plug Number of Flutes 2 Pitch Diameter Limit H1 Tap Material High Speed Steel Tap Finish Bright Tap Thread Type UNC Right Hand Thread Length 11/16 In. Shank Dia 0.318 In. Overall Length 2-23/32 In. Number of Pieces 1California proposition 65 warning