12 best counterbore set
A counterbore set is a tool used in machining and industrial applications, specifically in metalworking and woodworking. It is a set of cutting tools designed to create counterbores, which are typically cylindrical recesses or holes with a flat bottom and larger diameter than the hole's entrance. Counterbores are used to accommodate the heads of screws, bolts, or other fasteners, allowing them to sit flush with or below the surface of the material being worked on. This provides a clean and even finish while maintaining the structural integrity of the joint or connection.
Key features and components of a counterbore set typically include:
Counterbore Bits: These are cutting tools with a pilot drill at the center and a cutting edge around the periphery. They are designed to bore out the larger, flat-bottomed hole.The pilot drill ensures accuracy and guides the counterbore bit into the material.
Pilot Pins: These are replaceable pins that match the diameter of the pilot drill on the counterbore bits. They help ensure precise hole placement and depth.
Adjustable Stops: Some counterbore sets come with adjustable stops that allow you to control the depth of the counterbore, ensuring uniformity in the recessed holes.
Storage Case: Counterbore sets often come in a durable storage case that keeps the various components organized and protected when not in use.
Counterbore sets are commonly used in industries such as construction, metalworking, woodworking, and manufacturing, where precise and aesthetically pleasing fastener installations are important. They come in various sizes and configurations to accommodate different fastener types and material thicknesses.
Using a counterbore set requires careful setup and positioning to ensure accurate and consistent results. Proper maintenance and sharpening of the cutting edges are also essential to extend the life of the tools and maintain their cutting efficiency.
In summary, a counterbore set is an essential tool for creating recessed holes with flat bottoms, commonly used to accommodate fasteners in various industrial and woodworking applications.
Below you can find our editor's choice of the best counterbore set on the market
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 |
21 Pc. 5/16-5/8" HSS Counterbore Set Interchangeable Pilots 3/8" Shank
TrongStar
Product description
Supplied in fitted case.
- Our Part # ALL-10500
- Set includes 6 counterbores: 5/16", 3/8", 7/16", 1/2", 9/16" & 3/4" diameters
- Set includes 14 pilots: .1870", .2040", .2130", .2290", 1/4", 17/64", 9/32", 5/16", 21/64", 11/32", 3/8", 25/64", 13/32" & 7/16"
- Also includes each: 3/8" shank & wrench (shank measures 3.5" overall) Made of high quality High Speed Steel (HSS)
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. |
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. |
Accusize Industrial Tools 39 Pc Hss Interchangeable Pilot Counterbore Set, Counterbores from 1/4'' up to 1'' by 16ths, 500S-A000
Accusize Co., Ltd.
- Complete with pilots in fitted case
- Each set includes:13 counterbores-26 pilots
- Counterbores: 1/4" to 1" by 16ths
- Soild wood excellent packing
- Straight shank
Product features
Accusize Industrial Tools 39 Pc Hss Interchangeable Pilot Counterbore Set, Counterbores from 1/4'' up to 1'' by 16ths, 500S-A000
- Complete with pilots in fitted case
- Includes 13 counterbores-26 pilots
- Counterbores: 1/4" to 1" by 16ths
- Solid wooden packing
- Straight Shank
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. |
Countersink Drill Bit Set Carpentry Tools Countersunk Counter Sink Bit 10mm Width for Woodworking Wood Counterbore 5pcs
- 5 sizes: 0.11'',0.12'', 0.125'', 0.138, 0.157''. Chunk Size: 0.31'' (8mm) -0.39''(10mm)
- High Quality Material: Carbide Countersink Drill Bit Set, High precision, smooth cutting edge, Easy to drill and sink.
- 2-in-1 function: The Countersink Drill Bits Set can save your working time and improve efficiency, because drilling and countersinking work in one step.
- Adjustable Counterbore: Adjustable length of the lower head, with fixing screw, use the attached Hex Key, remove the screw and set the length of the counter bore.
- Great Gift: Good woodworking present for Professional Use and DIY Homeowner. Note - Keep the drill bit vertical during operation. This depth only needs to sink the screw head below the surface.
Product features
Center Positioning Drill
Adjustable Length, Quickly Discharge Chips, provide the stable and safe drilling work
Hex-Key Wrench
Coming with a hex key wrench, adjust drilling depth for screws of various lengths, is not easy to fall off.
Carbide Blade
Sharpened Edge, Quick and Smooth Countersink
Safe and durable design, easy and fast drilling round holes, good for cutting work
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] |
7 PC HSS Counterbore Set Size #6 8 10 1/4-1/2 Cap Screws Expand Holes
PROLINEMAX
Product description
- 7 PC HSS Counterbore Set
- Set Includes: 6#, 8#,10#, 1/4'', 5/16'', 3/8'', 1/2'' Sizes
- Sizes #6: Length: 3'' Long, Cutter Dia: .242" , Pilot: .150" , Shank Size: 7/32"
- Sizes #8: Length: 3'' Long , Cutter Dia: 19/64" , Pilot: .11/64" , Shank Size: 1/4"
- Sizes #10: Length: 3-1/2'' Long , Cutter Dia: .21/64" , Pilot: .13/64" , Shank Size: 5/16"
- Sizes #1/4'': Length: 4-7/8'' Long , Cutter Dia: 13/32" , Pilot: 9/32" , Shank Size: 3/8"
- Sizes #5/16'': Length: 5'' Long , Cutter Dia: 1/2" , Pilot: 11/32" , Shank Size: 7/16"
- Sizes #3/8'': Length: 6'' Long , Cutter Dia: 19/32" , Pilot: 13/32" , Shank Size: 1/2"
- Sizes #1/2'': Length: 7-1/2'' Long Cutter Dia: 25/32" Pilot: 17/32" Shank Size: 1/2"
- Used For Expanding General Rough Hole Or Hole Processing For Bolts
- Smooth Chip Flow And Powerful Cutting Resistance Because Of 3 Lips For Regrinding
- High Speed Steel
- Wooden Box INCLUDED
- Wooden Box Dimension: 4-7/8''L x 8-1/4''W x 1-1/2''H
- Weight: 2.45 Lbs
- Quantity: 1
HHIP 2007-0021 21 Piece HSS Interchangeable Pilot Counterbore Set
ABS Import Tools Inc.
Product description
21 Piece High Speed Steel Interchangeable Pilot Counter bore Set ~ Supplied in a fitted case. ~ 14 pilots with a 5/32" shank including 0. 187, 0. 204, 0. 213, 0. 229, 1/4, 17/64, 9/32, 5/16, 21/64, 11/32, 3/8, 25/64, 13/32 and 7/16. ~ 6 counter bores including 5/16, 3/8, 7/16, 1/2, 9/16 and 5/8. ~ 1 Holder with a 3/8" shank. ~ Straight shank. ~ 3 Flute.
- Supplied in a fitted case.
- 14 pilots with a 5/32" shank.
- 6 counter bores.
- 1 Holder with a 3/8" shank.
- Straight shank. ~ 3 Flute.
User questions & answers
| Question: | Are these for woodor metal |
| Answer: | SORRY, WE DO NOT HAVE A VIDEO. HOPEFULLY SOMEONE WHO PURCHASED POSTS A VIDEO OF THESE IN USE |
| Question: | Could someone post a video showing the components - ideally in use |
| Answer: | WE ONLY OFFER THE HOLDER IN THE SET |
| Question: | Do you just sell the holder by itself |
| Answer: | Jeff,Thank you for asking.Sorry the information was missing...Here it is:14 Pilots5/32" Shank: 0.187, 0.204, 0.213, 0.229, 1/4, 17/64,9/32, 5/16, 21/64, 11/32, 3/8,25/64, 13/32 & 7/16"6 Counterbores5/16, 3/8, 7/16, 1/2, 9/16, 5/8"1 Holder3/8" ShankI will update our information on Amazon.Thank you for your interestRob B |
| Question: | What are the sizes |
| Answer: | Each. Piece comes in its own case for storage. |
Product features
2007-0021 - 21 Piece HSS Interchangeable Pilot Counterbore Set - WC
HHIP 21 Piece HSS Interchangeable pilot counterbore set is supplied in a fitted case. 14 pilots with a 5/32" shank including 0.187, 0.204, 0.213, 0.229, 1/4, 17/64, 9/32, 5/16, 21/64, 11/32, 3/8, 25/64, 13/32 and 7/16. 6 counterbores including 5/16, 3/8, 7/16, 1/2, 9/16 and 5/8. 1 Holder with a 3/8" shank.
POWLAB 5pcs Counterbore Set High-Speed Steel M3-M8 4 Flutes HSS-AL Straight Shank Counterbore End Mills for Copper, Aluminum, Steel, Cast Iron
Product description
An essential hardware tool for industrial.
Specifications:
Material: High-speed steel.
Drill Quantity:5pcs.
Drill Size: m3, m4, m5, m6, m8.
Package Weight: Approx.130g /4.6oz
Package List:
5 * Counterbore End Mill
- Mill cutters are made of hard high speed steel, usually used to be assembled on milling machine.
- It includes 5 sizes in one counterbore set(m3, m4, m5, m6, m8).Please refer to the size chart for detailed data.
- High toughness, abrasion resistance, high-speed cutting for the high hardness.
- Reduces times of changing tools, improves machine actuator movement efficiency and save mold making time.
- Suitable for milling of copper, aluminum, steel, cast iron, etc.An essential hardware tool for industrial.
5/16-5/8" 21 Pc HSS Counterbore Set 2MT Shank
TrongStar
Product description
Supplied in fitted case.
- Our Part # ALL-10502
- Set includes 6 counterbores: 5/16", 3/8", 7/16", 1/2", 9/16" & 5/8" diameters
- Set includes 14 pilots: .1870", .2040", .2130", .2290", 1/4", 17/64", 9/32", 5/16", 21/64", 11/32", 3/8", 25/64", 13/32" & 7/16"
- Also includes each: #2 Morse Taper shank & wrench (shank measures 4.5" overall) Made of high quality High Speed Steel (HSS)
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