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Thread: Countersunk socket head screws
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21st Aug 2018, 12:15 PM #1Most Valued Member
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Countersunk socket head screws
went to order some UNC 5/16 CS sh screws and asked for a countersink as well..yep no problems they say.
I ask if its 82 degree...countersales says no its 90? they didnt know that UNC was 82 until I pointed him to unbrako page..never been asked for one..records show they have never sold one... how can they sell UNC CS SH screws and have no idea..this is reputable nuts n bolts outlet. What have all others customers been doing when they buy UNC CS? even > than 20mm metric changes to some other obscure angle..60?
what does every one else do?...any links to reasonably priced 82...
best I could source from non online wanted a kidney as well as my wallet.
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21st Aug 2018, 12:36 PM #2Most Valued Member
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If you have the room in the material can you just counter sink deeper to get the head below the surface,angle would not be correct but may work, otherwise grind a drill to suit.
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21st Aug 2018, 01:16 PM #3Most Valued Member
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21st Aug 2018, 01:45 PM #4Most Valued Member
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That's unfortunate.
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21st Aug 2018, 01:56 PM #5Senior Member
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Can you use the drill sharpener to re-grind the csk heads?
Graham.
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21st Aug 2018, 04:48 PM #6China
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https://www.unitedfasteners.com.au/ you could try this mob
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21st Aug 2018, 08:17 PM #7.
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Hi Richard,
Cheap 82 degree countersinks are available but whether they are any good is another question - https://www.ebay.com.au/itm/2Pcs-1-2...0AAOSwubFaeXd-
A single Weldon bit may not be too prohibitively expensive if you have a Shipito account - https://www.ebay.com/itm/Weldon-CS-1...-/202135251705
Bob.
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21st Aug 2018, 08:21 PM #8Most Valued Member
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21st Aug 2018, 08:22 PM #9Most Valued Member
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21st Aug 2018, 08:31 PM #10Most Valued Member
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I did question those too Bob...sound too cheap to be hss
can still get one from usa if I need to and it will still be cheaper than what General Tools and Teravin Tools here in adelaide quoted...both in excess of $95 with one being over the ton. I will keep looking.
to mod a drill and run the risk of totally stuffing it is not to my liking ...its about 19mm dia head in the cs screws
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21st Aug 2018, 08:43 PM #11Most Valued Member
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22nd Aug 2018, 02:44 AM #12
Hi Eskimo,
I was lucky and got a set of weldon countersinks and deburring cutters cheap. However it is not dificult to regrind a three flute 90 degree countersink to 82 degrees with the lathe and tool post mounted Dremel. You could do the same with a twist drill if you wanted to.
Or how about a spade bit ? You would have to make a holder, but the replacement blades aren’t to expensive, and they are carbide.
A Weldon countersink to do 20mm ain’t going to be cheap.Best Regards:
Baron J.
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22nd Aug 2018, 08:44 AM #13Most Valued Member
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Would a 'D' bit cope with the job? Easy to make with a lathe and mill.
Phil
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22nd Aug 2018, 10:39 AM #14Most Valued Member
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22nd Aug 2018, 11:17 AM #15Most Valued Member
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