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Unread 05-13-2013, 02:14 PM   #1
CJ7ROB
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Countersinks for 3/16" steel

Anyone know what type of countersink armor manufacturers like Poison Spyder use to countersink the holes in their armor? Particularly their crusher corners.McMaster-Carr has the countersinks in all different angles, but I'm not sure which one to go with, thanks.

I need one like this for these type of bolts.



http://shop.poisonspyder.com/CJ-7-Re...4-010-alum.htm

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Unread 05-13-2013, 05:16 PM   #2
BESRK
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If you've got the bolts, you can just mike the heads to see what diameter you'll need.

Even without the bolts, if you know what size you're going to use (5/16" Countersunk Allen Heads for instance), you can look up their dimensions online to see which bit you'll need.

I'm not at the shop right now, but I think I use a 5/8" bit to get a good fit with 5/16" allen heads going thru 3/16" plate.. I could be mistaken though.
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Unread 05-13-2013, 07:07 PM   #3
CJ7ROB
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Thanks Eddie my bolts are 3/8" and the diameter of the head is 3/4" Do you think I need a 3/4" countersink bit? Also how do I properly check the angle so I get the right bit? Thx It looks like it just may be a std 45 degree bit.
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Unread 05-13-2013, 09:42 PM   #4
popascj7
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Standard machine screws have an 82 degree angle.
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Unread 05-14-2013, 03:10 PM   #5
BESRK
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If the bolt head is 3/4" dia, then the 3/4" bit would allow a perfect fit flush with the surface of the sheet. The issue then becomes the "thickness" of the head. If the head of the bolt is thicker than 3/16", then it will protrude above the surface.. or, you'll have to make the hole (in both the 3/16" and the sheetmetal under it) big enough for the bolt head to drop in all the way.

When I was digging around for my countersink bit, I think I went with 5/16" allen head countersunk bolts because the head thickness worked out to be about 3/16" thick.
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Unread 05-15-2013, 01:27 PM   #6
CJ7ROB
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Oh I see what you mean. I'll have to play with it to see how deep the head goes into the metal. Thanks for the info.
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Unread 05-22-2013, 07:46 PM   #7
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Quote:
Originally Posted by popascj7 View Post
Standard machine screws have an 82 degree angle.
Correct. SAE flat head machine screws are 82 and metric flat head machine screws are 90.
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