Application Information
T-15 HSS spade blades are recommended:
• For providing straighter and more consistent holes with superior surface finishes
than can be produced using either HSS twist drills or carbide indexable drills.
• When rigidity of the machine or the fixture requires a more forgiving, durable,
and tougher tool; T-15 steel possesses a higher transverse rupture strength and
is more impact-resistant than comparable carbide spade blades and/or carbide
indexable drills.
• In applications requiring hole depths up through 15x to 20x diameter; pecking
may be required for depths above 7x diameter for some materials.
• As a cost-effective alternative to carbide indexable drills since T-15 steel spade
blades operate at comparable penetration rates to single-effective indexable
drills in materials <35 Rc, and one spade blade holder accommodates multiple
diameter blades.
Spade Blade Holders
widia.com
U27
Generally can accommodate a range of blade sizes up to 1.30–1.35 times the
smallest blade size. It is therefore possible to cover the entire range of hole sizes with
just a few spade drill holders. Contrast this with the inventories required for indexable
drills and steel taper shank drills.