13 best steel counterbore sets

• 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.

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.

• 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]

Product description

Bonsicoky is a brand that pursues high quality and provides high-quality, reliable and practical hardware products for global customers. Our product quality and innovation will continue to improve, and in the future we will launch more high-quality hardware products. We hope you like Bonsicoky products too!





Feature:

1.The three-tooth design of the cutter head has high sharpness, small cutting resistance and improved opening efficiency.

2.High-speed steel shank with strong shank for machine tool drilling, charging drill, bench drill and other machines.

3.It has multiple cutting edges to ensure cuts cleanly and accurately with no wobbling or burning the wood, and longer service life.





Specifications:

Material: High Speed Steel

Size: 15mm（19/32inch）；16mm（5/8inch）；17mm（43/64inch）；18mm（45/64inch）；19mm（3/4inch）；20mm（25/32inch）；21mm（53/64inch）；22mm（55/64inch）；23mm（29/32inch）；24mm（15/16inch）；25mm（1inch）；26mm（1-1/16inch）；28mm（1-1/8inch）；30mm（1-3/16inch）；32mm（1-1/4inch） ；35mm（1-3/8inch）

Package Included: 16 x Drill Bits





Warm tips:

1.You can sharpen the bit when it dull after long time use, take care of your hand.

2.When you using this drill bit, the materials temperature will get very high, please add some water or coolant to avoid the material get smoke.

• 【What can you get】16Pcs Forstner Drill Bits with 16 different boring diameters: 19/32inch, 5/8inch, 43/64inch, 45/64inch, 3/4inch, 25/32inch, 53/64inch, 55/64inch, 29/32inch, 15/16inch, 1inch, 1-1/16inch, 1-1/8inch, 1-3/16inch, 1-1/4inch, 1-3/8inch, which can meet your various needs in this professional set.
• 【High Quality】Forstner Drill Bit is made from High Speed Steel and being hot-treated, make blade more sharp, high accuracy and durable , smooth cutting operation, good resistance to shock and good toughness.
• 【Perfect Design】Small incision resistance, improve the opening speed, chip easy, no tremor and less noise. The curve design is beneficial to chip removal. Perforation is more efficient. The perforation is neat, smooth, no broken edge.
• 【Wide Use】Any wood and wood products, plastic, plywood and other materials you need to exquisite perforation, suitable for industrial hinge installation, wood processing and maintenance, model production, installation of spherical door, drawers and other occasions.
• 【90 Days Money Back Guarantee】We believe in consistent service and quality. If you are not satisfied with the product, please contact us and we will refund the full amount. Now click ‘Add to Cart’ , this will be your most reliable choice and bring you a 100% worry-free shopping experience!

Product description

Meichoon Forstner Drill Bit - Wide Application: used for wood, particle board, top drawer, plywood, etc. Applicable to the pistol drill, bench drill, vertical drilling machine etc.

Specifications:

Material: Cemented carbide

Size: 15mm/20mm/25mm/30mm/35mm

Quantity: 5pcs

Weight: 250g

Package Included:

5 x Drill Bits

Important Note:

When you using this drill bit, the materials (eg. wood, plastic products, plywood ect.) temperature will get very high, please add some water or coolant to avoid the material get smoke.

• High-speed steel woodworking hole saw open hole neat, smooth, no tremor can sharp cutting edge improves opening speed, easy chip removal also for longer life.
• High speed steel shank, sturdy - Suit for drill press, pistol drill, bench drill, vertical drilling machine, hand held electric drill, stand motor-driven drilling machine and mobile ribbon type magnetism drilling machine etc.
• Forstner Drill Bit Package include 5PCS, 15mm/20mm/25mm/30mm/35mm, can meet your different needs.
• Small incision resistance, improve the opening speed, chip easy and no tremor.
• Perfect used for mounting spherical door shoot tip, drawer; perforation on wood products , plastic products, wood and plywood etc.

User questions & answers

Question:	How big are the two section of the shank
Answer:	The shank length is 65mm, its diameter is standrad size.
Question:	Are they carbide or hss
Answer:	Its right in the description, they are carbide
Question:	Where are these made? The broken English in "Important note" is very suspicious
Answer:	I think made in China but very good quality

• 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

Product description

The NEIKO 10059A Combination Drill and Tap Bit Set comes stocked with 13 pcs of SAE and Metric sizes to fulfill multiple steps in a breeze. The tools are designed to drill, tap, and countersink through various tough materials with ease, while the deburring feature cleans the holes smoothly and bits countersinks threaded holes. Its High Speed Steel construction also improves the cutting performance of the drill and makes it more wear-resistant, prolonging its service life.



These specialized bits can cut through aluminum, plastic, metal and much more to complete many different types of jobs. The bits are fast and with multiple sizes available, it ensures proper hole sizing. The 1/4 inch (6.35mm) Hex Shank has a tapered end to assure over tapping is prevented and the back taper exceeds the tap to prevent over-drilling and damage to the thread.



Finally, these bits come with a storage case and are provided in both SAE and Metric sizes engraved onto each piece for easy identification.

• [QUALITY]: High Speed Steel designed to ensure sharp, fast execution with strength and efficiency.
• [VERSATILE]: Three in one tool that provides hole drilling, tapping, and countersinking for a quick and complete job on copper, brass, aluminum, sheet metal and plastic.
• [CONVENIENT]: 1/4” Hex Shank features a tapered end to prevent over-tapping and includes a quick-change adapter for easy size change.
• [STORAGE]: Heavy duty, molded plastic case that is lightweight and durable for easy storage and portability for all jobs.
• [SIZES]: SAE – 6-32nc, 8-32nc, 10-24nc, 10-32nc, 12-24nc, 1/4-20NC; Metric – M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1.25, M10 x 1.5; Quick change adapter.

User questions & answers

Question:	What is the length of the bit/tap portion? I have to go through 30mm and need to make sure these are long enough. Thank you
Answer:	The size labels are only backwards in the first picture and correct in the other pictures. The size text must have been added to the image post-production.
Question:	How do i get a replacement bit
Answer:	These stubby drills are not designed to work in masonry. If you use them that way you will ruin the dill bit. Depending on hoe deep you want the hole to be and if you were prepared to throw the drill away afterwards you could try but I doubt you would have much success. RP
Question:	Do you need to slow the drill speed way down once you reach the Tap part of the shaft
Answer:	It's not a 13 PC set but could possibly have some of the sizes you need. Take a look at the Neiko 11401A 6pc drill bit set. Sizes: 3/32, 1/8, 3/16, 1/4, 5/16 and 3/8-inch.
Question:	Are any of these tap drill bits the right size for any zerk fitting
Answer:	1 3/4 " to 2 1/4 ".

Product features

Durable Construction

High Speed Steel construction provides extra durability to drill bits to perform multiple drilling operations, while maintaining its strength.

Works on Multiple Materials and Surfaces

Drill Bits perform hole drilling, tapping, and countersinking in one operation. Drill on copper, brass, aluminum, sheet metal, and much more.

SAE and Metric Sizes Included

Our set provides high versatility by including both SAE and Metric sizes. Each bit is equipped with a 1/4" Hex Shank with a slightly tapered end to prevent over-tapping.

Convenient Swivel Storage Case

Swivel feature props up drill bits and securely holds them in place until ready to use. The storage case folds up neatly and is convenient to travel with on different job sites and locations.

Quick Change Adapter Included

Maximize efficiency with the included quick change adapter that allows you to switch between different sizes easily.

Easy to Read Labeling

Each drill bit is engraved with the appropriate sizes for easy identification.

• 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.

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.

Product description

3 Piece, Countersink Set, Rapid Load System, Durable Rubber Finger Grips For Comfortable Use, Impact & Rust Resistant Nickel Plated Nose, Stainless Steel Interior Parts & Pressure Activated Ball Groove System For Rapid Loading & Strong Retention, Provides Quick & Easy Accessory Changes Without Rechucking, Accessories Have Hex Shank Locking System To Prevent Slipping, Holder Fits All Brands Of 3/8" & 1/2" Cordless & Corded Drills.

From the Manufacturer

DEWALT DW2535 3 Piece #6, #8, and #9 Countersink Assortment

• The product is 3PC Countersink Set
• Easy and simple use kit
• The product is manufactured in China
• Drill, countersink and counterbore in one step
• Four cutter countersink and tapered drill bit provide superior speed and ideal finish
• Replacement tapered bits offered

User questions & answers

Question:	If I'm using 3/4 inch screws that would require me to tighten the countersink onto the threaded section of the bit is that ok
Answer:	There is no easy way to do it using this kind of packaging. If you buy the bigger spools, you can just put some kind of axle through the larger spool and let the line unwind straight onto the trimmer spool with zero twisting. One way to minimize twist from this type of packaging is to make sure to wind your spool the opposite way that the line is coiled in the package. If the package is coiled clockwise, wind your spool counter-clockwise. I have a gas trimmer, so I load from the center of the trimmer line out. My spool holds 8 arm's lengths of line, so I measure out 4 arm's lengths of line and start winding from that point instead of measuring out the whole 8 arm's lengths then finding the center and winding. There are much fewer tangles and mess that way.
Question:	Are these impact driver ready
Answer:	Hello there, Yes, it will work with the string trimmer from combo pack STBA40B210.
Question:	what size works for drywall screws
Answer:	Hello there, No, this is a dual line spool replacement. Model 21332 is a single line unit. Here is the compatible spool replacement model 29252: https://www.amazon.com/Greenworks-065-Inch-Trimmer-Replacement-29252/dp/B004EPXIA6/ref=sr_1_1?s=lawn-garden&ie=UTF8&qid=1528466445&sr=1-1&keywords=29252
Question:	what size plug cutter do i need for this set
Answer:	Hello there, No, it will not. Model 2101202 comes with a quick-load trimmer head. Simply use trimmer line at .080" in diameter and rewind the existing spool yourself. Here's a video on how this can easily be done: https://www.youtube.com/watch?v=YgVkrrx9gLg We hope this helps.

Product features

DEWALT DW2535

- Drill, countersink and counterbore in one step

- Replacement tapered bits offered

- Four-cutter countersink and tapered drill bit provide superior speed and ideal finish

- The product is 3PC Countersink Set

- Easy and simple use kit

Product description

Specifications

Material:High Speed Steels

Size:6mm,8mm,12mm,16mm,19mm

Quantity: 1Set(6 Drills)

Length:48mm/1.88''

Features:

Durable and practical.

Ideal for Wooden planks,Fiberboard,Particle board,Plywood,Plastic,Alumiumn Board ,etc.

Suitable for DIY, Home and General Building/Engineering Using.

Package include:

1 x 6mm Drill

1 x 8mm Drill

1 x 9mm Drill

1 x 12mm Drill

1 x 16mm Drill

1 x 19mm Drill

User questions & answers

Question:	Hi can be use on metal for countersink hole
Answer:	These are designed for wood, I don’t think they would last long on steel. To countersink steel I use a standard drill ground to 118 degrees but there are “countersink bits” for steel.

Product description

Meichoon Forstner Drill Bit - Wide Application: used for wood, particle board, top drawer, plywood, etc. Applicable to the pistol drill, bench drill, vertical drilling machine etc.

Specifications:

Material: Cemented carbide

Size: 15mm, 20mm, 25mm, 30mm, 35mm

Quantity: 5pcs

Weight: 330g

Package Included:

5 x Drill Bits

Important Note:

When you using this drill bit, the materials (eg. wood, plastic products, plywood ect.) temperature will get very high , please add some water or coolant to avoid the material get smoke.

• Good Material - Made from tungsten steel and being hot-treated, the blade is characterized by high accuracy, smooth cutting operation, good resistance to shock and good toughness.
• High speed steel shank, sturdy - Suit for drill press, pistol drill, bench drill, vertical drilling machine, hand held electric drill, stand motor-driven drilling machine and mobile ribbon type magnetism drilling machine etc.
• Forstner Drill Bit Package include 6PCS, 30mm/35mm/40mm/45mm/50mm/60mm, can meet your different needs.
• Small incision resistance, improve the opening speed, chip easy and no tremor.
• Wide range of applications - Any wood and wood products, plastic, plywood and other materials you need to exquisite perforation, suitable for industrial hinge installation, wood processing and maintenance, model production, installation of spherical door, drawers and other occasions.

Product description

• 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.
• Straight shank.

• Includes 1 holder with 3/8" shank
• 14 pilots and 6 counterbores
• Counterbore includes 5/16", 33/8", 7/16", 1/2", 9/16" and 5/8"
• Pilot includes 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"
• Nice crafted black metal box