IS 12689 : 1989 Small Tools - Subland Twist Drills with Parallel Shanks for Clearance Holes and Counterbores for Slotted Cheese Head Screws - Specification

1 Scope

1.1 This Indian Standard covers dimensions and otherrequirements for the subland twist drills with parallel shanks forproducing clearance holes and counterbores for cheese head screwsM3 to M10 - medium series conforming to IS 3406 : Part 2 : 1986`Dimensions for countersinks and counterbores: Part 2 Counterbores.

2 References

IS 2 :1960Rules for rounding off numerical values

IS 3406 : Part 2 :1986 Dimension for countersinks andcounterbores:Part 2 counterbores

IS 5099 : 1983Technical supply conditions for twist drills

IS 7778 :1975Method for sampling small tools

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