Rolandranch
Member
I am having trouble finding a 7mm carbide or carbide tipped drill bit. I have a big order that's due soon and wondered if anybody had a spare they could sell me.
Wanted 7mm Carbide Drill Bit
- Thread starter Rolandranch
- Start date
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Curly
Member
Industrial suppliers rather than pen making suppliers is the way to go. You might even have one in the city you live in.
An example of a mail order company. Unless you are drilling extreme materials I would order Cobalt bits.
One of your local suppliers.
An example of a mail order company. Unless you are drilling extreme materials I would order Cobalt bits.
One of your local suppliers.
Last edited:
egnald
Member
Greetings from Nebraska. I buy all of my specialty drill bits from McMaster Carr. I have had very good luck with them and usually receive my order in 3 days or less.
They offer a lot of options including Carbide and Titanium-Nitride coated Carbide. Solid Carbide is not cheap! A 7mm will cost in the neighborhood of $40-$50, but a carbide tipped bit will run around $20 or less. This Link should take you to McMaster Carr's 7mm drill page.
Regards,
Dave
PS In my case I am not adept at sharpening drill bits nor do I have a sharpening machine or jig, so Carbide bits are my preference. Sometimes though I just buy inexpensive HSS bits and just switch them out when they start to get dull (especially for unique or low usage sizes).
For some materials I am a fan of bits that have parabolic spiral flutes, sometimes called Chip-Clearing bits. (The ones made for drilling Stainless Steel usually have an additional coating). Chip removal using parabolic flutes really helps prevent the risk of heat buildup caused by the flutes getting packed full while drilling. (Fisch and others even make parabolic bits that they label as "Pen Maker's Bits").
I am also a firm believer in specialized bits for drilling plastic and have acquired over time a comprehensive set that covers most pen drill sizes. The prices are not too bad until you get into the larger bit sizes. For example, a 7mm is just a little over $10. To me, the extra cost is worth it if it prevents me from blowing up a $10 Alumilite blank.
They offer a lot of options including Carbide and Titanium-Nitride coated Carbide. Solid Carbide is not cheap! A 7mm will cost in the neighborhood of $40-$50, but a carbide tipped bit will run around $20 or less. This Link should take you to McMaster Carr's 7mm drill page.
Regards,
Dave
PS In my case I am not adept at sharpening drill bits nor do I have a sharpening machine or jig, so Carbide bits are my preference. Sometimes though I just buy inexpensive HSS bits and just switch them out when they start to get dull (especially for unique or low usage sizes).
For some materials I am a fan of bits that have parabolic spiral flutes, sometimes called Chip-Clearing bits. (The ones made for drilling Stainless Steel usually have an additional coating). Chip removal using parabolic flutes really helps prevent the risk of heat buildup caused by the flutes getting packed full while drilling. (Fisch and others even make parabolic bits that they label as "Pen Maker's Bits").
I am also a firm believer in specialized bits for drilling plastic and have acquired over time a comprehensive set that covers most pen drill sizes. The prices are not too bad until you get into the larger bit sizes. For example, a 7mm is just a little over $10. To me, the extra cost is worth it if it prevents me from blowing up a $10 Alumilite blank.
InkyMike
Member
In addition to those listed, http://drillsandcutters.com/ is another good source for online ordering of bits (they also have a good selection of single start taps and dies, too)
wimkluck
Member
Full carbide drills are often used in CNC machines. 7mm drill dept 45mm. Here in metric land available. I can give you 2 links but no idea if they will ship. https://shop.marree.nl/verspanende-...metaalboor-hm-tip-11-600e-1stuks-7-mm-1691292 Carbidetip
https://www.hoffmann-group.com/NL/n...6-7?comingFromCategory=10-01-00-00-00&tId=979 Full carbide
https://www.hoffmann-group.com/NL/n...6-7?comingFromCategory=10-01-00-00-00&tId=979 Full carbide
Rolandranch
Member
Thanks all for the help. Ended up finishing the order with hss. Supertool is where I get my carbide bits usually, but they were on backorder this time around. Thanks again for the info and links.