The SD-9 Series Ball Shape Carbide Burr 1/4" Shank (103-66204) is a precision-ground, USA manufactured solid tungsten carbide burr in the D Series Ball Shape. With a 1 head diameter, 1 length of cut, and a 1/4 X 2 shank, it delivers controlled stock removal and clean finishes on cast iron, steel, copper, and brass alloys. Available in Single Cut and Double Cut.
Available in Single Cut and Double Cut
Right-hand spiral flute for controlled chip evacuation
Solid tungsten carbide, not coated steel
Head diameter 1, length of cut 1, shank 1/4 X 2
USA manufactured
Head Diam1
Cut Length1
Shank1/4
OAL2
Specifications
SKU / Part Number103-66204
Shape / TypeD Series Ball Shape
Cut TypeSingle Cut / Double Cut
Head Diameter1
Shank Diameter1/4
Length of Cut1
Overall Length2
MaterialSolid Tungsten Carbide
Material CompatibilityMetal, Wood
Brand / ManufacturerCarbide Burrs Direct
Made InUSA
Key Features
◆Solid tungsten carbide
Ground from solid carbide rod, not a coated or brazed bit. Maintains sharpness longer and holds diameter under heavy use.
◆Tight-tolerance grinding
Head diameter held to +/-0.001" for repeatable results run after run, critical for detail work at the 1 head size.
◆Single Cut and Double Cut available
Single cut removes material fast with a smooth finish. Double cut combines right and left-hand flutes for an ultra-smooth surface and maximum control. Ball shape geometry is ideal for creating concave profiles, rounding edges, and reaching curved internal surfaces.
◆USA manufactured quality
Every burr is ground in the USA to ANSI tolerances with documented traceability and consistent quality batch to batch.
Buying Guide: SD-9 Series Ball Shape Carbide Burr 1/4" Shank
Use this guide to pick the right 103-66204 cut type for your application before ordering.
Choose Single Cut if...
You are removing significant material quickly
Working on cast iron, steel, or hard alloys
Surface finish is secondary to stock removal rate
You prefer a burr that runs cooler with less chatter
Single cut produces longer chips. Use with good chip clearance and air blast.
Choose Double Cut if...
You need a smooth or near-finished surface
Working on copper, brass, or softer alloys
Precision detail work where control matters more than speed
You want finer chips and less hand fatigue over long runs
Double cut gives more control. Preferred for porting, deburring, and blending weld seams.
Shank compatibility: The 103-66204 uses a 1/4 shank with 2 overall length. Verify your collet or handpiece accepts 1/4 before ordering. Call 1-844-313-7153 with questions.
Frequently Asked Questions
What is the difference between Single Cut and Double Cut on the 103-66204?
Single Cut has one right-hand spiral flute that removes material quickly and leaves a good surface finish on cast iron and steel. Double Cut combines right and left-hand flutes to produce a much finer finish with less vibration and more control. It is the preferred choice for brass, copper, and any application where surface quality matters more than removal rate.
Can the 103-66204 be used on aluminum or stainless steel?
The 103-66204 is rated for cast iron, steel, copper, and brass alloys in standard Single and Double Cut. For aluminum and soft non-ferrous metals, the Aluma-Cut version is the correct choice as its open-flute geometry prevents loading and clogging. For stainless steel, either cut type works but slower RPM and consistent feed pressure are recommended to avoid work hardening.
What RPM should I run the 103-66204 at?
For a 1 head diameter, recommended surface speed is 35,000 to 50,000 RPM on a standard die grinder. The 1/4 shank fits standard collets. Always start at lower RPM, let the burr do the work without forcing it, and increase speed gradually. Call 1-844-313-7153 for application-specific guidance.
Customer Reviews
4.8
★★★★★
Based on 5 verified purchases
GP
Grace P.
Riverside, CA
★★★★★
December 2023
Perfect for copper pipe deburring
Been using the SD-9 Series Ball Shape Carbide Burr 1/4" Shank for several months. Consistent results every run. The Single Cut option is exactly right for this work. Fast shipping from Santa Ana, CA, had it on my bench in two days.
Verified purchase · Single Cut
JL
Jason L.
Oakland, CA
★★★★★
September 2023
Best burr at this size I have found
Needed a reliable tool for tool and die work and the SD-9 Series Ball Shape Carbide Burr 1/4" Shank delivered. Runs true, consistent finish every time. Called 1-844-313-7153 before ordering and got great advice.
Verified purchase · Single Cut
KM
Kevin M.
San Diego, CA
★★★★☆
November 2023
Great quality, fast ship
Ordered for die casting cleanup work. Quality is noticeably better than import alternatives. The Double Cut gives excellent results without loading up. Will reorder without hesitation.
Verified purchase · Double Cut
JC
James C.
Glendale, CA
★★★★★
January 2024
Called before ordering, excellent advice
Was not sure which cut type for precision metalwork. Called 1-844-313-7153 and got real help. Went with Double Cut, exactly the right call.
Verified purchase · Double Cut
RV
Roberto V.
Sacramento, CA
★★★★★
February 2024
Consistent quality every order
Shop supervisor at a fabrication facility. We use the SD-9 Series Ball Shape Carbide Burr 1/4" Shank for port and polish work regularly. Outlasts big-box imports by a wide margin. Reordered multiple times. USA manufactured and it shows.
Verified purchase · Single Cut
Why Choose Carbide Burrs Direct
01USA manufactured
Every product is manufactured in the USA to ANSI tolerances, not an import rebranded with an American sticker. Documented traceability and consistent quality batch to batch.
02Direct pricing, no distributor markup
We sell direct from our warehouse at 1846 So Grand Ave, Santa Ana, California 92705. No rep, no middleman, no inflated list price. The price machinists and fabricators actually pay.
03Same-day shipping on in-stock orders
Orders placed before 2 PM PST on business days ship same day from Santa Ana, CA. Call us at 1-844-313-7153 to confirm stock before you need it on the floor.
04Expert phone support
Not sure whether Single Cut or Double Cut is right for your material and finish? Call 1-844-313-7153 and our team will get you the right burr the first time.
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