Howmet Fastening Systems
Howmet Fastening Systems
Phone: Sales +1 800 992 4444
Technical Support +1 310 784 6409
Email: HFSTechSupport@howmet.com
Website: www.hfs.howmet.com
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Unit of Measure

Specifications

Series

 N/A SDC

Material Type

 N/A High Speed Steel

Heat Treat

 N/A Per Drill Manufacturer´s Standard

Finish

 N/A Strippable Plastic Coat to Protect Cutting Edges (Tube Packaging Optional)

Size

 N/A 390

A - Dia +.000 -.001

 N/A 0.317 in

B - Dia (Ref.)

 N/A 0.3891 - 0.3906 in

C ±.015

 N/A 0.940 in

D

 N/A 3.125-3.375 in

E - Dia ±.005

 N/A 0.390 in

Notes

Notes

 N/A
  • <2> Conical point optional.
  • Made from standard straight shank jobbers or screw machine twist drills.
  • Dimensions and tolerances not shown are per ANSI B94.11M.
  • Caution: Step drills are designed for thru hole drilling. When used to drill a blind hole, it may be necessary to grind the drill to suit the depth required.