PRECISION GROUND FLUTE HCS MATERIAL; 18 TPI; RIGHT HAND DIRECTION OF CUT; TAPER STYLE; 4 FLUTE(S); UNC THREAD TYPE; 5/16 INCH TAP SIZE; HAND WRENCHING; 5/16 TAP SIZE - FRACTIONAL; .3125 TAP SIZE - DECIMAL; HANSON. BRAND; TAPER CHAMFER 8 TO 10 THREAD