#54 HSS Black Oxide Jobber Length Drill Bit, Shank Type: Round Ideal for production, maintenance or portable drilling jobs.. Surface treated with abrasion-resistant black oxide.
Screw machine drills are popular in the automotive and construction industries.Short, rugged construction performs well in a broad range of materials. N HSS Heavy Duty Split Point Stub Drill Bit Screw machine drills (also know as stub or stubby drills) are manufactured to National Aerospace Standard 907.
If the counterbored portion is shallow (1/8" or less), the operations is usually known as spot-facing; for example, a flat seat for a bolt head or nut.. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring.
Black oxide high-speed steel dill bits are ideal for production, maintenance or portable drilling jobs and are surface treated with abrasion-resistant black oxide. Hand taps are also appropriate for tapping the vast majority of materials in through or blind holed conditions.