Fuller Taper Point Drills are used to pre-drill shank holes in wood and plastics.
Taper Point Drills are recommended for most jobs using hand-held equipment or a stationary drill press. They cut both hard and softwoods well.
Fuller Taper Point Drills are made in standard fractional sizes to fit all types of countersinks and counterbores with sizes and lengths to match the most popular wood screws.
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Wood Screw Size
Drill Diameter (inches)
Flute Length (inches)
Overall Length (inches)
What degree are these bits?
they match standard wood screw taper, whatever that is. I suggest you pull up the fuller website, get thir number and call them. They have good tech support.Rod
Fuller's website doesn't specify, but I have found other sources (Jamestown included) that specify Fuller at 135 degrees.
The bits are tapered to match the taper of a wood screw.The size of the screw ( 8,10,12) determines the sizeof the bit you should use.There are charts available to help you choose the right bit.If you are referring to the countersink angle that's another matter.
At what diameter does the 1/8" bit taper to?
The 1/8 inch drill bit tapers to 1/16 inch.
The bit tapers down to something close to 1/16". I can't be precise because the flutes of the bit converge at that point. Hope this helps.
Thanks Rick. My question is really more wondering. What diameter the thinnest part of this bit is.
Probably what is most important- these bits are designed for tapered wood screws and their nominal diameter should be what is recommended for the screw wire size being used.They allow the correct pilot hole, especially important in hardwoods. Hope this is useful.
approx. .057" or 1.5 mm
As the bits are is tapered, the tip is a bit rounded, and about 3/32 or a bit less, depending on nominal size.
I need a # 8-- what size is that ?
JD has a chart that you can print that provides straight and taper drill sizes (also countersink and bung sizes) for various screw sizes. I have printed the chart and keep it in my drill index/bit storage case.For a #8 wood screw, the chart calls for a 11/64" taper bit for hardwood or 5/32" taper bit for softwood. For a #8 sheetmetal (straight) screw, use a 1/8" or 7/64" straight bit for hardwood/softwood respectively.
what size drill and countersink and bung is recommended for a #8 screw ?
11/64 is listed on this web site under tech specs for a #8 screw. I would recommend a 3/8" bung, however I would measure the exact size of your specific screw.
ERIC VAN DORMOLEN
countersinks for fuller tapered drills ?
Yes. The tapered drill bits work well when fit with a countersink.I would recommend using them when using brass and stainless wood screws. They help the fasteners to hold better.
ROBERT E. AIOSA
Great bits for pre-drilling wood screws
We purchased 1/8" and 11/64" diameter sizes of these drill bits for use in our production wood shop. They seem to be of high quality to us. We use them for #8 and #10 screw sizes, which is smaller than recommended. We did find out the 1/8" are a bit small, especially for hardwoods, but the 11/64" are perfect in our experience. In our opinion the sizes recommended on the chart are too large.
I've been using these bits for over 25 years and there are no better on the market.
Fuller Tapered Drill Bits and counter Sink
Great bit and countersink, quality product.
Fuller Tapers, great product
I've been using Fuller tapers, c'sinks and bung cutters for over 25 years. Go-to tooling and plenty durable. Taper bits make useful holes for wood screws, but be heads-up on using short or long screws and the affect that tapered profile has vs. screw length. Also, the c'sink set screws need to be set securely, avoid slipping and unintentionally deeper holes. The best single-bit option out there.
San Diego, CA
Fuller Drill Bits
The Fuller taper drill / countersink / plug system is superb.
Cape Cod, MA
Great for predrilling holes for wood screws, makes a great tight fit that is easy to drive screws into, no more guessing diameters and length or stripping screws
Wood screw heaven
The tapered drills do an outstanding job with any woodworking project. They make driving long wood screws into hardwoods a pleasure. The Fuller brand drills are very high quality. I'm a fan.