Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 1/4, Letter Size E, Decimal Equivalent 0.2500, Flute Length (In.) 2-3/4, Flute Length (mm) -, Overall Length (In.) 4, Overall Length (mm) -, Shank Dia. (In.) 1/4, Shank Dia. (mm) 6.35, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -
Heavy-Duty Jobbers Length Cobalt Drills, 135
- List# 550, 2550, and 550TA drills meet/exceed National Aerospace Standards 907, Type J. List# 550ASP drills meet/exceed National Aerospace Standards 907, Type B and have a thinner web for hand/portable drilling. List# 3780 drills have a shorter flute length and extra-heavy web for rigid aircraft maintenance applications and a fast 40 helix for chip removal.
- Split point