550 NAS-Type Heavy-Duty Cobalt Straw Jobber-Length Drill Bit 0.3125 in dia Cutting 4.5 in OAL 5/16 in

Product Description

Manufactured to NAS 907 Type J geometry aerospace specifications. Heavy-duty construction for drilling in tough, high-tensile, and work-hardening materials. Manufactured from premium cobalt high-speed steel. Straw finish adds lubricity and easily identifies cobalt drills. 135?? P3 split point is self-centering for reduced thrust and easier penetration. Sizes smaller than 0.0625 inch do not have split point.


Applicable Materials Alloy Steel; Stainless Steel; Titanium; Tool Steel
Point Angle 135?? RHS/RHC
Dia. [Nom] 5/16 in
Overall Length [Nom] 4.5 in
SKU Group Auto-Id 219972
Flute Length 3.1875 in
Cutting Diam [Nom] 0.3125 in
Material HSS-CO 8% (M42)
Coating Straw
No. of Flutes 2
Type Style 550
Bit Length 4.5 in
Shank Type Straight
Finish Straw
Point Shape Split
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