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When you need a clean, accurate 15/32-inch hole in tough metal, this Triumph Twist Drill bit is the kind of tool that earns a permanent spot in your kit. It runs a 135-degree split point that starts right where you place it, so you get less walking and truer holes even on curved or hardened surfaces. The high speed steel body keeps its cutting edges sharp through repeat use, and the black oxide finish helps it shed heat and shrug off rust and wear.
Jobber length is the go-to profile for general drilling because it gives you enough reach for deeper holes without the flex you'd fight with a longer bit. This one measures out to the standard 15/32" (.4687") diameter with roughly a 4-5/16" flute and a 5-3/4" overall length, so it clears chips well and fits standard chucks with the drill size matching the shank. It's the same size drill you'll reach for on plenty of receiver, mount, and fixture jobs.
Black oxide HSS is at its best in iron and steel, including low and medium carbon, high alloy, and stainless, along with tough and medium high-tensile alloys. That covers most of what lands on a gunsmith's bench, from drilling and tapping work to shop fabrication. It's not the pick for aluminum or soft nonferrous metals, where an uncoated or bright bit tends to run cleaner.
Triumph Twist Drill has been making cutting tools in the USA since the early 1950s, and that reputation for quality shows up in how these bits hold an edge. Run it at the right speed with a little cutting oil and this 15/32-inch bit will give you clean, repeatable holes job after job.
Black oxide HSS bits like this one are made for drilling iron and steel, including low and medium carbon, high alloy, and stainless, plus tough and medium high-tensile alloys. That covers most of the hard metals you find on a gunsmith's bench. It's not the best choice for aluminum or other soft nonferrous metals, where a bright or uncoated bit runs cleaner.
Jobber length is the most common all-around drill bit profile, giving you enough reach for standard-depth holes without the extra flex of a longer bit. For the 15/32" size, that works out to roughly a 4-5/16" flute and a 5-3/4" overall length. It's a versatile everyday length that handles the majority of drilling jobs.
The 135-degree split point is self-centering, so the bit starts drilling right where you place it instead of skating across the surface. That means less walking and truer holes, even on curved or hardened workpieces. It also cuts with less pushing pressure, which is a real help in tougher steels.
Using cutting oil is a good idea when drilling steel and other hard metals with this bit. It keeps heat down, helps clear chips, and extends the life of the cutting edges. Pair that with the right drill speed for the material and you'll get cleaner holes and more life out of the bit.
| UPC | 086839114309 |
|---|---|
| Manufacturer | |
| Color | Black Oxide |
| Quantity | 1 |
| Style | obber Drill Bits- Drill Bit Style |
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