Nose Grind - Contour Combinations
Nose GrindsOptimum drilling performance is achieved by the proper combination of nose grind and contour. For the widest variety of drilled holes, the Sterling Gun Drills standard 30 degrees x 20 degrees N-8 nose grind combined with the R-1 low land contour will prove best. However, any single or combination of variables, such as angled entry, exit, cross holes, very deep holes, reaming, stepped holes, even large diameter or material specifications may lead us to recommended a non-standard combination, with or without surface coatings. Please consult Sterling Gun Drills for the best combination suited for your application.
N-8: General Purpose, sweep or facet
Standard nose grind used for most materials
See Contour: R1: Low Land
N-4: Aluminum Grind, sweep or facet
Allows more oil to flute
N-13: Cast Iron Grind, sweep or facet
Good size control
N-73: Stack Grind, sweep or facet
Good for layered materials
ContoursFor special materials, please consult your Sterling Gun Drills representative, toll free at 1-888-338-1049 during our normal business hours.
Non-micable, for most solid drilling applications.
Low Land & Top
Non-micable, for reaming and non ferrous metals.
Micable, for cross holes, very deep holes, angled entry, exit. Not recommended for very short holes or high nickel alloys.
High Land & Top
Micable, cross drilling and reaming. Not for high nickel materials.
More information about Gun Drill Styles & their uses?