IS 12688 : 1989 Small Tools - Subland Twist Drills with Morse Taper Shank for Clearance Holes and Countersinks for Countersunk Head Screws - Specification

1 Scope

1.1 This standard covers dimensions and other requirements forthe subland twist drills with morse taper shank for producingclearance holes and countersinks for countersunk head screws M5 toM14 conforming to IS 3406 : Part 1 : 1986 `Dimensions forcountersinks and counterbores: Part 1 Countersinks (secondrevision).

2 References

IS 3406 : Part 1 :1986 Dimensions for constructions andcounterbores :Part 1 Countersinks

IS 5099 :1983Technical supply conditions for twist - drills

IS 7778 :1975Methods for sampling small tools

IS 10915 :1984 Terms, definitions and types of twist drills