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When you need one dependable bit that lands a hole exactly where you want it, this Triumph Twist Drill 35/64" fractional jobber bit gets the job done. It measures out to a .5469" diameter, which puts it right in that useful range for opening up holes, tapping prep, and precision fitment work on the bench. Triumph is a Minnesota-based maker that has built a reputation for quality American-made cutting tools that hold up in demanding repair and maintenance jobs, and this bit carries that same standard.
This one is ground from high speed steel and treated with a black oxide finish. That coating does two things worth caring about: it cuts down friction as the bit spins and it adds abrasion and corrosion resistance so the bit runs cooler and lasts longer. Black oxide is a surface treatment best suited for drilling iron and steel, which makes it a natural fit for gunsmithing and metal fabrication. The standard 118 degree point handles a broad range of materials cleanly, from steel and cast iron to brass, aluminum, and plastic.
Jobber length is the everyday standard length you reach for most often, versatile enough to move between the drill press and a handheld drill without fuss. At this diameter the bit runs about 6-5/8" overall with a straight round shank, so it chucks up in pretty much any standard drill or press without adapters. The fractional 35/64" sizing gives you that in-between measurement that letter and number bits do not always cover, which is exactly why it earns a spot in a gunsmith's index.
Whether you are drilling and tapping a scope base, opening a hole for a pin, or handling general shop metalwork, this is the kind of bit that just works when you need it. Chuck it up, run it at the right speed with a little cutting oil, and it will reward you with clean, accurate holes.
This bit measures 35/64" fractional, which works out to a decimal diameter of .5469". That in-between fractional size fills the gaps that letter and number drills do not always cover, which is why it is handy to have in your index.
Black oxide is a surface treatment recommended for drilling iron and steel, and it also handles brass, copper, plastic, and wood well. The coating reduces friction and adds abrasion and corrosion resistance so the bit runs cooler and lasts longer. It is not the ideal choice for aluminum or magnesium, where an uncoated or specialty bit is preferred.
Yes. It has a straight round shank, so it chucks up in standard handheld drills, keyless chucks, and drill press chucks without any adapters. Jobber length is the everyday standard length, so it moves easily between the press and portable drilling.
It is a solid fit. The high speed steel construction and black oxide finish are geared toward drilling steel, which covers a lot of common gunsmithing tasks like drilling for scope bases, pins, and general metal fitment. Run it at the correct speed with cutting oil for the cleanest, most accurate holes.
| UPC | 086839917351 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 091735 |
| Color | Black Oxide |
| Quantity | 1 |
| Style | obber Drill Bits- Drill Bit Style |
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