engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Fitter Machining Drilling and Reaming
As per the Indian standard (IS) system, a drill bit is designated as 9.5-H-IS5101-HS, in this the number 9.5 stands ‘for------
1
Rake angle
2
Drill bit length
3
Spindle diameter
4
Drill diameter