Metallics HSDAC27 HD 135d SplPt Aircraft High Speed Drill Bit#27 6" (1pc)

A #27 wire gauge bit cuts a 0.144 inch hole, which is the standard tap size for a #10-24 machine screw thread. That makes the Metallics HSDAC27 a common choice for drilling and tapping strut, channel, and sheet steel for 10-24 fasteners.

Reach. The Metallics HSDAC27 is a 6 inch aircraft-length bit, so it drills through the back of a box, past a stud flange, or into a junction behind existing conduit where a short jobber bit cannot get the chuck in. For open, accessible drilling a standard jobber bit is stiffer and tracks straighter; the long aircraft bit trades some rigidity for access.

The 135 degree split point on the HSDAC27 self-centers, so it starts in hard steel without a center punch and without walking across the surface. It also cuts with less thrust than a conventional 118 degree point, which matters on a long 6 inch bit where heavy pressure would flex it. Good for strut, panel enclosures, and structural steel; on wood or plastic the split point can grab.

The HSDAC27 is plain high speed steel. It handles mild steel, galvanized strut, sheet enclosures, and aluminum fine at moderate speed with cutting fluid. For stainless or work-hardened material, run slow with steady pressure and fluid, or step up to a cobalt bit instead; high speed steel will lose its edge quickly in those.

One bit per pack, supplied in a pouch. If you are stocking a van or an MRO cage and want spares of a size that snaps, order the quantity you need rather than expecting a multi-pack.

Order it by Metallics part number HSDAC27. That is the manufacturer number and the only model offered, so there are no length or finish variants to specify.