12 best piloted counterbore drill bit
A piloted counterbore drill bit is a specialized cutting tool used in machining and woodworking applications. It is designed to create a specific type of hole that combines a counterbore and a pilot hole in a single operation. Here are the key features and applications of piloted counterbore drill bits:
Design: A piloted counterbore drill bit typically consists of two main parts: the cutting portion and a pilot shaft. The cutting portion is often in the shape of a cylindrical cutter with a flat bottom, while the pilot shaft guides the drill bit into the workpiece.
Counterbore Function: The primary function of the counterbore section is to create a flat-bottomed, larger-diameter hole at the top of an existing hole. This counterbore allows for the insertion of fasteners such as screws, bolts, or dowels with their heads or caps flush with or below the surface of the workpiece.
Pilot Hole Function: The pilot shaft at the center of the drill bit serves two purposes. First, it guides the drill bit into the existing hole accurately, ensuring that the counterbore is centered and properly aligned with the initial hole. Second, it creates a smaller-diameter pilot hole within the counterbore.
Materials: Piloted counterbore drill bits are typically made from high-speed steel (HSS) or carbide to provide durability and maintain sharp cutting edges when used with various materials, including wood, plastic, and metal.
Applications: Piloted counterbore drill bits are commonly used in woodworking, cabinetry, and joinery applications.They are especially useful when you need to attach fasteners while maintaining a flush or concealed finish, as they allow the fastener head to sit flat against the surface.
Versatility: These drill bits come in various sizes to accommodate different fastener sizes and hole depths. They are available with interchangeable pilot shafts, making them versatile and suitable for various projects.
Usage Tips: When using piloted counterbore drill bits, it's essential to secure the workpiece properly and maintain a consistent drilling speed to achieve clean and precise results. Additionally, selecting the right size of drill bit and pilot shaft is crucial to match the fasteners you plan to use.
In summary, a piloted counterbore drill bit is a specialized cutting tool that combines counterboring and pilot hole drilling in a single operation. It is commonly used in woodworking and metalworking to create holes that accommodate fasteners with flush or concealed finishes, providing a neat and professional appearance to the final workpiece.
Below you can find our editor's choice of the best piloted counterbore drill bit on the market
Preamer 5pcs M3-M8 Pilot Slotting Counterbore Mould End Mill Cutter Solid Slot Countersink End Mill Drill Bit
Preamer
Product description
Specifications:
Material: HSS-AL
Item color: silver
Weight: 128g(approx.)
Hardness: HRC 65~68
Size:
M3: 5.9 (blade diameter) * 3.2 (boot) * 6 (shank diameter) * 45 (full length)
M4: 7.4 (blade diameter) * 4.2 (boot) * 6 (shank diameter) * 48 (full length)
M5: 9.5 (blade diameter) * 5.2 (boot) * 6 (shank diameter) * 51 (full length)
M6: 11.0 (blade diameter) * 6.2 (boot) * 8 (shank diameter) * 58 (full length)
M8: 14.0 (blade diameter) * 8.2 (boot) * 12 (handle diameter) * 67 (full length)
Package Included:
1 Set(5pcs) x Countersink Mill Cutters
- 5pcs/Set M3 M4 M5 M6 M8 HSS Countersink End Mill Cutters Drill Bits Set 4 Flute Metal Drilling Slot Drill Bit Woodworking Pilot Milling Cutting Tools Set
- Mill Cutter, usually used to be assembled on milling machine.
- Suitable for carved, high-speed machines.Reducing the number of tool changes, improve machine actuator movement rhythm, save mold making time.
- Can milling of copper, aluminum, tool steel, cast iron, etc.
- High toughness, abrasion resistance, high-speed cutting for the high hardness.
User questions & answers
| Question: | Can anyone tell what is being sold here from the description |
| Answer: | As a counterbore tool, it's putting in a counter bore (recess) onto a clearance hole for a bolt to sit below flush of a surface. Typical clearance for a bolt will be +.03 With that much clearance, run-out isn't an issue. With my use in a machine shop, I found them to run pretty true. I did not check the run-out with an indicator, a visual inspection was enough for me. As to being on-size, under size or oversize, the pilot on these counter-bore tools was +.03 of whatever bolt size. Example, the 1/4" tool has a pilot of of .280, this is your standard .03 clearance. For the price, I was very happy with this purchase. |
7Pcs/set Counterbore Drill Bit Sets HSS Counterbore End Milling Cutter M3.2-M12.4 Countersink Drill Bits Pilot Slotting Milling Cutter End Mill Cutting Tool Set for Copper Aluminum Cast Iron
Product description
Made of high quality HSS, sturdy and durable, not easy to break, usually used to be assembled on milling machine.
High toughness, abrasion resistance, high-speed cutting, can processing directly or fine processing to the heat treatment mold.
Reducing the number of tool changes, improve machine actuator movement rhythm, save mold making time, perfect for drilling copper, aluminum, tool steel, cast iron, etc.
This kit is suitable for DIY at home and daily use, it allows to drill easily and effectively, without burr, A MUST TOOL for DIY lover
Specifications:
Material: high speed steel
Length: approx.48-74mm
Shank diameter: approx.10mm
Size: M3.2 (3.2*5.9mm), M4.2 (4.2*7.4mm), M5.2 (5.2*8.9mm), M6.2 (6.2x10.4mm), M8.2 (8.2x13.4mm), M10.3 (10.3x16.8mm), M12.4 (12.4x18.8mm)
Package Content:
1 Set(7pcs) x Mill Cutters
Notes:
1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!
2. Please allow 1-3cm measuring deviation due to manual measurement
- Made of high quality HSS, sturdy and durable, not easy to break, long service life.
- Size: M3.2 (3.2*5.9mm), M4.2 (4.2*7.4mm), M5.2 (5.2*8.9mm), M6.2 (6.2x10.4mm), M8.2 (8.2x13.4mm), M10.3 (10.3x16.8mm), M12.4 (12.4x18.8mm)
- High toughness, abrasion resistance, high-speed and accurately cutting, can processing directly or fine processing to the heat treatment mold.
- Reducing the number of tool changes, improve machine actuator movement rhythm, save mold making time, perfect for drilling copper, aluminum, tool steel, cast iron, etc.
- Reducing the number of tool changes, improve machine actuator movement rhythm, save mold making time, perfect for drilling copper, aluminum, tool steel, cast iron, etc.
Accusize Industrial Tools H.S.S. Solid Cap Screw Counterbore Set, 3 Flute, Straight Shank, 7 Pc, 508S-0007
Accusize Co., Ltd.
- High Speed Steel
- Straight Shank
- Inch Set (7 PC) : 6#, 8#, 10#, 1/4'', 5/16'', 3/8'', 1/2''
User questions & answers
| Question: | what are the pilot diameters? this data is required in order to verify the drawings currently in the works... thanks |
| Answer: | They are exactly inches, Inch Set (7 Pcs) : 6#, 8#, 10#, 1/4'', 5/16'', 3/8'', 1/2''. |
| Question: | These are not metric converted to the closest inch? I want to be sure that they are measured in Inches, not millimeters |
| Answer: | Hello,Thank you for your interest in our products. I tried to upload a chart to answer your question but Amazon dose not allow pure text pictures to be shown in the product page.Following are the specs, hope the format does not mess up.Screw Size Pilot Diameter Cutting Diameter Shank Diameter Overall Length#6 0.150" 0.242" 7/32" 3"#8 11/64" 19/64" 1/4" 3"#10 13/64" 21/64" 5/16" 3-1/2"1/4" 9/32" 13/32" 3/8" 5"5/16" 11/32" 1/2" 7/16" 5"3/8" 13/32" 19/32" 1/2" 6"1/2" 17/32" 25/32" 1/2" 7-1/2" M3 3.4mm 6mm 7/32" 3"M4 4.5mm 8mm 5/16" 3-1/2"M5 5.5mm 10mm 5/16" 4-1/2"M6 6.6mm 11mm 1/2" 5"M8 9mm 15mm 1/2" 6"M10 11mm 18mm 1/2" 7"M12 14mm 20mm 5/8" 7-1/2" |
| Question: | What size are the pilots? Are they interchangeable with other sizes (such as 3/16" pilots |
| Answer: | We are located in Toronto, Canada, to ship this item to USA address by expedited canada post / UP post are this shipping rate. which takes 5 to 7 business days arrived the US address with registered. if you order more items, the combination shipping will be more competitive. |
| Question: | Why is the shipping so high? Almost 23?cant you charge a better price |
| Answer: | I don't know the CFM. But I use this on my angle die grinder to get in tight spaces without running full speed and shredding aluminum engine components. |
KKmoon 7pcs/Set Counterbore Set High-Speed Steel 4 Flutes Straight Shank Counterbore End Mills
KKmoon
- An essential hardware tool for industrial.
- High speed steel, high quality and durable.
- The counterbore set works great in counter bored hole.
- It includes 7 sizes in one counterbore set(m3, m4, m5, m6, m8, m10, m12).
- Apply to cast iron, steel, copper, aluminum, conventional hardness of stainless steel and die steel, etc.
User questions & answers
| Question: | Are these in a case or a stand |
| Answer: | Yes, that's is how we use them. |
| Question: | Can this be used on a drill press |
| Answer: | My measurements are #12 - 12.35mm, #10 - 10.25mm, #8 - 8.15mm, #6 - 6.15mm, #5 - 5.15mm, #4 - 4.15mm, #3 - 3.15mm. |
| Question: | What are the pilot diameters |
| Answer: | The kit has included 4 Black Bar holders, 4 Red T8 Wrench and 10pcs inserts. They could be used directly. The Wrench, the holder and the inserts all could be purchased separately. If you need to buy in the future, you could send email to [email protected] |
Snappy Tools 1/8 Inch x 1/2 Inch 3-Flute Flat Bottom Counterbore with TiN coated twist drill #33208
Make it Snappy
Product description
Use SD-3 Counterbores to drill a pilot hole and counterbore a flat bottomed hole in one step. Perfect for lag screws, lag bolts, washer head screws, T-nuts & more.
- Drive Shank: 1/4 Inch Hex Power Bit Shank
- Drill Size: 1/8 Inch
- Counterbore Size: 1/2 Inch
User questions & answers
| Question: | Can the 3/8" drill be taken out and replaced by a 3/8" rod |
| Answer: | The drill bit can be taken out and replaced |
| Question: | is this ok to use on metal |
| Answer: | They are not. |
| Question: | How long does the drill bit stick out from the beginning counter sink cutting edge |
| Answer: | I purchased two sizes. On the 5/8" counterbore, the bit extends 1-1/2 inches beyond the cutting edge. On the 1/2" counterbore, the bit extends 1-1/4 inches. |
| Question: | Can you use this for the 1/2 walnut face wood plugs |
| Answer: | You should test this before trying on an assembly. The 3/8 inch counter bore would 1/16 inch from the edge. If your drill center is not dead on center you will break through the radius edge of the plug. I hope this helps. |
Amana Tool - 55288 Carbide Tipped Counterbore 5/8 Dia x 1/4 Quick Release Hex Shank
Amana Tool
Product description
Flat bottom counterbores for using round head screws, Hex bolts, etc. Includes pilot drill, #55288, (D) Diameter: 5/8, (D) shank: 1/4, overall length (L): 2-3/4, D1: 1/4, replacement drill: 630-70255288 carbide Tipped Counterbore 5/8 dia x 1/4 Quick release hex shank
- (D) Diameter: 5/8
- (D) shank: 1/4
- Overall length (L): 2-3/4
- D1: 1/4
- Replacement drill: 630-702
User questions & answers
| Question: | will this cut steel |
| Answer: | I used it to spot face some angled holes on some 4in. angle iron. Worked like a charm. I would buy more as needed. |
M10.3 Pilot Counterbore End Mill Cutters Mould Solid Slot Drill Bit Slotting Tool, Pack of 1
Edinstry
Product description
Features
Mill Cutter usually used to be assembled on milling machine. Suitable for carved, high-speed machines.
Can milling of copper, aluminum, tool steel, cast iron, etc.
High toughness, abrasion resistance, high-speed cutting for the high hardness
Can processing directly or fine processing to the heat treatment mold
Reducing the number of tool changes, improve machine actuator movement rhythm, save mold making time
Material: High-speed Steel
Length: 60-70 mm
Shank Diameter: 10 mm
Size Specifications
M3.2: 3.2 x 5.9 mm
M4.2: 4.2 x 7.4 mm
M5.2: 5.2 x 8.9 mm
M6.2: 6.2 x 10.4 mm
M8.2: 8.2 x 13.4 mm
M10.3: 10.3 x 16.8 mm
M12.4: 12.4 x 18.8 mm
Packing Include
1 x Pilot Counterbore End Mill Cutter
- Mill Cutter usually used to be assembled on milling machine. Suitable for carved, high-speed machines.
- Can milling of copper, aluminum, tool steel, cast iron, etc.
- High toughness, abrasion resistance, high-speed cutting for the high hardness
- Can processing directly or fine processing to the heat treatment mold
- Reducing the number of tool changes, improve machine actuator movement rhythm, save mold making time
Accusize Industrial Tools 7 Pc'' H.S.S. Solid Capscrew Counterbore Set 3 Flute Straight Shank, 509S-0007
Accusize Co., Ltd.
- Inch Sizes: 6#, 8#,10#, 1/4'', 5/16'', 3/8'', 1/2''
- H.S.S.; Straight Shank
- Bright Finished
- Premium Quality
- Packed in Solid Strong Wooden Box
User questions & answers
| Question: | Can you tell us want grade steel it is, m2. M7, etc |
| Answer: | Thanks for asking. the difference is not only the strong nice fitted wooden box, This counterbore set made in higher grade High-Speed Steel which is much better than the regular set. Thank you! |
| Question: | What makes these premium vs the regular set? Different steel, or just a wood box |
| Answer: | Shank sizes M3-5.5mm, M4-7.9, M5-7.9, M6-12.7, M8-12.7, M110-12.7, M12-15.8 |
Amana Tool - (55227) Carbide Tipped 82° Countersink with Adjustable Depth Stop & No-Thrust Ball Bearing, 3/8 Dia x 1/8 Drill
Amana Tool
Product description
Features an adjustable, heavy-duty, revolving depth-stop with a strong Thrust ball bearing for Quick and easy adjustment of the countersink depth without scratching or burning surfaces. It also has an open space to allow for chip evacuation. The user friendly design enables control of the drill length and its replacement, without the need to disassemble the depth-stop. Enables users to drill a pilot hole and tapered Countersink in one step. The adjustable depth-stop and independent stop Collar prevent marking of the workpiece and perfect Countersink depth control, #55227, (A°) angle 49°, (B) Cutting Height 3/64-3/8, (D) Diameter 3/8, (D) shank 1/4, overall length (L) 2-5/8, drill DIN 1897, wood screw size 6, D1 1/8, replacement drill 630-226, replacement Countersink 55272, use with plug Cutter (optional) 55220, 55227 carbide Tipped 82 degree Countersink with adjustable depth stop and no-thrust ball bearing, 3/8 dia x 1/8 drill DIA x 1/4 inch quick release hex shank
- (A°) angle 49°
- (B) Cutting height 3/64-3/8
- (D) Diameter 3/8
- (D) shank 1/4
- Overall length (L) 2-5/8
User questions & answers
| Question: | Will the countersink work in aluminum |
| Answer: | Drill bit sizes: 1/8 inch to 1/2 inch in 1/64 inch increments. |
| Question: | What is the drill bit size |
| Answer: | Bits larger than 23/64" have 3/8" shank |
| Question: | What is the OD of the counterbore, and what is the maximum depth of the counterbore hole |
| Answer: | I have used them on plywood without a problem. Slow feed on the breakthrough gives a nice burr free hole. |
| Question: | Where is it made |
| Answer: | Yes---- the bits go up to 1/2" |
Amana Tool - (55282) Carbide Tipped Counterbore 3/8 Dia x 1/4 Quick Release Hex Shank
Amana
Product description
Flat bottom counterbores for using round head screws, Hex bolts, etc. Includes pilot drill, #55282, (D) Diameter: 3/8, (D) shank: 1/4, overall length (L): 2-3/16, D1: 3/16, replacement drill: 630-40255282 carbide Tipped Counterbore 3/8 dia x 1/4 Quick release hex shank
- (D) Diameter: 3/8
- (D) shank: 1/4
- Overall length (L): 2-3/16
- D1: 3/16
- Replacement drill: 630-402
Amana Tool - (55286) Carbide Tipped Counterbore 1/2 Dia x 1/4 Quick Release Hex Shank
Amana Tool
Product description
Flat bottom counterbores for using round head screws, Hex bolts, etc. Includes pilot drill, #55286, (D) Diameter: 1/2, (D) shank: 1/4, overall length (L): 2-3/4, D1: 1/4, replacement drill: 630-70255286 carbide Tipped Counterbore 1/2 dia x 1/4 Quick release hex shank
- (D) Diameter: 1/2
- (D) shank: 1/4
- Overall length (L): 2-3/4
- D1: 1/4
- Replacement drill: 630-702
Accusize Industrial Tools 7 Pc Metric Hss Solid Capscrew Counterbore Set, 3 Flute, Straight Shank, 508S-007m
Accusize Co., Ltd.
- Metric Set (7PC): M3, M4, M5, M6, M8, M10, M12
- 3 Flute
- High Speed Steel
- Straight Shank
- Shank sizes: M3-5.5mm/.218", M4-7.9mm/.312", M5-7.9mm/.312", M6-12.7mm/.500", M8-12.7mm/.500", M110-12.7mm/.500", M12-15.8mm/.625"+
User questions & answers
| Question: | Shank size for each bit |
| Answer: | These are three flute co bores and pilots are three flute as well, so measurement of pilots is as follows.. 1/2 is .531 pilot..3/8 is .406 pilot.. 5/16 is .343 pilot .. 1/4 is .281 pilot .. #10 is .204 pilot .. # 8 is .171 pilot .. #6 is .150 pilot Bear in mind I did these measurements with digital dial calipers, so plus or minus .002 is possible. I do not know what tolerances the manufacturer used, so your set may not be exactly the same as mine. |
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