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Countersunk screw-head diameter and angle
For a #6 countersunk machine screw could some one please tell me, or point
me somewhere I could find out: a) The diameter of the screw-head b) The angle of the countersink Sorry if this is a very basic question - I couldn't find the answers by Googling. Thanks, Jim |
Countersunk screw-head diameter and angle
25th Edition of Machinery's Handbook, page 1494 shows the following: Diameter of screw head: .279 max, .228 min. Angle: 99 to 101 degree included This for ANSI B18.6.3 - 1972 R1977 flat head machine screws On Sun, 7 Mar 2004 16:31:09 -0000, "Jim" wrote: For a #6 countersunk machine screw could some one please tell me, or point me somewhere I could find out: a) The diameter of the screw-head b) The angle of the countersink Sorry if this is a very basic question - I couldn't find the answers by Googling. Thanks, Jim Errol Groff Instructor, Machine Tool Department H.H. Ellis Tech 613 Upper Maple Street Danielson, CT 06239 860 774 8511 x1811 http://pages.cthome.net/errol.groff/ http://newenglandmodelengineeringsociety.org/ |
Countersunk screw-head diameter and angle
"Jim" wrote in message ... For a #6 countersunk machine screw could some one please tell me, or point me somewhere I could find out: a) The diameter of the screw-head b) The angle of the countersink Imperial countersunk screws (socket head) have an 82º head. A #6 should has a .307Ø theoretical sharp head. If you were to measure one, it could be as small as about .263 but your c-sink has to be .307Ø or the top of the screw will lie above the top of the work surface. Regards, Robin |
Countersunk screw-head diameter and angle
"Errol Groff" wrote in message ... 25th Edition of Machinery's Handbook, page 1494 shows the following: Diameter of screw head: .279 max, .228 min. Angle: 99 to 101 degree included This for ANSI B18.6.3 - 1972 R1977 flat head machine screws Doh! What kind of screw was the poster referring to? I don't think anything except for a hex socket belongs on a machine, but that's toolmaking... Flat, Phillips or socket (or Torx or...?) Regards, Robin |
Countersunk screw-head diameter and angle
"Robin S." wrote in message
... "Errol Groff" wrote in message ... 25th Edition of Machinery's Handbook, page 1494 shows the following: Diameter of screw head: .279 max, .228 min. Angle: 99 to 101 degree included This for ANSI B18.6.3 - 1972 R1977 flat head machine screws Doh! What kind of screw was the poster referring to? I don't think anything except for a hex socket belongs on a machine, but that's toolmaking... Flat, Phillips or socket (or Torx or...?) Regards, Robin Sorry, I forgot to say it is a Phillips screw. Jim |
Countersunk screw-head diameter and angle
"Robin S." wrote in message
... "Jim" wrote in message ... For a #6 countersunk machine screw could some one please tell me, or point me somewhere I could find out: a) The diameter of the screw-head b) The angle of the countersink Imperial countersunk screws (socket head) have an 82º head. A #6 should has a .307Ø theoretical sharp head. If you were to measure one, it could be as small as about .263 but your c-sink has to be .307Ø or the top of the screw will lie above the top of the work surface. Regards, Robin Thank you Robin, and Errol, for taking the time to find the info and reply. I am still slightly confused (I might not have asked the right questions). My situation is that I'm using a Hammond aluminum enclosure - dimensions shown he http://www.hammondmfg.com/pdf/1455L1601.pdf (150KB) The #6 machine screws supplied (Phillips) to attach the 1.5mm thick face panels actually sit proud of the panel. I'm having some custom panels made up and wanted to get the screws to sit flush with the panel. I've had a test panel made with 82deg countersink angle (sorry, I found that I already had that info) and a maximum diameter of 0.240". Now I have the panel back, the maximum diameter seems too big with the screws in place - there is an easily gap around the edge of the screwhead. I must have given you the wrong information, as the 0.307Ø is more than the 0.240Ø that I've tried. Many thanks for your help, Jim |
Countersunk screw-head diameter and angle
"Ned Simmons" wrote in message
... In article 95M2c.215$yt3.104@newsfep3- gui.server.ntli.net, says... snip My situation is that I'm using a Hammond aluminum enclosure - dimensions shown he http://www.hammondmfg.com/pdf/1455L1601.pdf (150KB) The #6 machine screws supplied (Phillips) to attach the 1.5mm thick face panels actually sit proud of the panel. snip As Robin said, .307 is the max head diameter for a #6 flat head hex socket screw. For a standard #6 flat head Phillips or slotted machine screw the max head dia is .279 . If the head height is greater than the thickness of the panel you'll have to either put a small contersink in the threaded hole, or get hold of the flat head screws often seen on electronic equipment panels where the head is truncated at the intersection of the head and body. Clear as mud? Normal flat head: ________ \ / \ __ / | | | | Truncated flat head: ________ \______/ | | | | Does anyone one know what this head style is called? Ned Simmons Hi Ned, Many thanks for your explanation. I now realize I've been asking the wrong question - sorry to you all. Looking at the Hammond enclosure diagram more carefully it says #6 screw, but #4 head. Indeed, the head is the same diameter as some other #4 screws I have around (but the thread is wider than those). I think this is what you mena by the truncated flat head. Sorry for the confusion! So my question should have been this: What is the max diameter of the head of a #4 flat head Phillips machine screw? Thank you, Jim |
Countersunk screw-head diameter and angle
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Countersunk screw-head diameter and angle
In article 6oN2c.408$yt3.407@newsfep3-
gui.server.ntli.net, says... "Ned Simmons" wrote in message ... In article 95M2c.215$yt3.104@newsfep3- gui.server.ntli.net, says... snip My situation is that I'm using a Hammond aluminum enclosure - dimensions shown he http://www.hammondmfg.com/pdf/1455L1601.pdf (150KB) The #6 machine screws supplied (Phillips) to attach the 1.5mm thick face panels actually sit proud of the panel. snip As Robin said, .307 is the max head diameter for a #6 flat head hex socket screw. For a standard #6 flat head Phillips or slotted machine screw the max head dia is .279 . If the head height is greater than the thickness of the panel you'll have to either put a small contersink in the threaded hole, or get hold of the flat head screws often seen on electronic equipment panels where the head is truncated at the intersection of the head and body. Clear as mud? Normal flat head: ________ \ / \ __ / | | | | Truncated flat head: ________ \______/ | | | | Does anyone one know what this head style is called? Ned Simmons Hi Ned, Many thanks for your explanation. I now realize I've been asking the wrong question - sorry to you all. Looking at the Hammond enclosure diagram more carefully it says #6 screw, but #4 head. Indeed, the head is the same diameter as some other #4 screws I have around (but the thread is wider than those). I think this is what you mena by the truncated flat head. Sorry for the confusion! So my question should have been this: What is the max diameter of the head of a #4 flat head Phillips machine screw? That's a new one to me--#4 head on a #6 screw. Looking at the Hammond print it sure looks like that's what they're describing. In any case, the head dia for a #4 FH is .225 max, matching the callout on the PANEL drawing. Ned Simmons |
Countersunk screw-head diameter and angle
there are different angles of flat head screws - I know this from painful
experience on aircraft - and if you get them mixed up you will see exactly what you are seeing - I don't remember the angles anymore - it could be 82 and 90 degrees, or it could be some other number - if you use one that is too acute, it sits above the sheet metal, if you use one too obtuse it doesn't have enough strength, and it's nearly impossible to tell them apart. "Ned Simmons" wrote in message ... In article 95M2c.215$yt3.104@newsfep3- gui.server.ntli.net, says... "Robin S." wrote in message ... "Jim" wrote in message ... For a #6 countersunk machine screw could some one please tell me, or point me somewhere I could find out: a) The diameter of the screw-head b) The angle of the countersink Imperial countersunk screws (socket head) have an 82º head. A #6 should has a .307Ø theoretical sharp head. If you were to measure one, it could be as small as about .263 but your c-sink has to be .307Ø or the top of the screw will lie above the top of the work surface. Regards, Robin Thank you Robin, and Errol, for taking the time to find the info and reply. I am still slightly confused (I might not have asked the right questions). My situation is that I'm using a Hammond aluminum enclosure - dimensions shown he http://www.hammondmfg.com/pdf/1455L1601.pdf (150KB) The #6 machine screws supplied (Phillips) to attach the 1.5mm thick face panels actually sit proud of the panel. I'm having some custom panels made up and wanted to get the screws to sit flush with the panel. I've had a test panel made with 82deg countersink angle (sorry, I found that I already had that info) and a maximum diameter of 0.240". Now I have the panel back, the maximum diameter seems too big with the screws in place - there is an easily gap around the edge of the screwhead. I must have given you the wrong information, as the 0.307Ø is more than the 0.240Ø that I've tried. As Robin said, .307 is the max head diameter for a #6 flat head hex socket screw. For a standard #6 flat head Phillips or slotted machine screw the max head dia is .279 . If the head height is greater than the thickness of the panel you'll have to either put a small contersink in the threaded hole, or get hold of the flat head screws often seen on electronic equipment panels where the head is truncated at the intersection of the head and body. Clear as mud? Normal flat head: ________ \ / \ __ / | | | | Truncated flat head: ________ \______/ | | | | Does anyone one know what this head style is called? Ned Simmons |
Countersunk screw-head diameter and angle
.... it could be 82 and 90 degrees, or it could be some other number ... Countersinks are made in 60, 82 and 90 degrees. Machine screws are 82 degrees. Specialty screws could be 90 degrees. |
Countersunk screw-head diameter and angle
"Ned Simmons" wrote in message
... That's a new one to me--#4 head on a #6 screw. Looking at the Hammond print it sure looks like that's what they're describing. In any case, the head dia for a #4 FH is .225 max, matching the callout on the PANEL drawing. Ned Simmons Many thanks - that does make more sense now. So the diameter of the hole was correct after all. The screws do protrude from the panel as supplied though. I think the problem is the flat area of the screw - it's edges are rounded off and I think it is this narrow section of screw that is protruding. My plan is to sink the coutersink hole down by a small amount (the height of this flat part of the screw head) to compensate. Jim |
Countersunk screw-head diameter and angle
"Peter H." wrote in message ... ... it could be 82 and 90 degrees, or it could be some other number ... Countersinks are made in 60, 82 and 90 degrees. Machine screws are 82 degrees. Specialty screws could be 90 degrees. Thanks for the info. Sorry - I didn't check the diagram closely enough; in fact it does state the countersink is 82 degrees. My confusion was caused by the #6 thread with #4 head. Jim |
Countersunk screw-head diameter and angle
"Peter H." wrote:
... it could be 82 and 90 degrees, or it could be some other number ... Countersinks are made in 60, 82 and 90 degrees. Machine screws are 82 degrees. Specialty screws could be 90 degrees. Aircraft machine screws that I work with are generally 100 degrees heads, as are the countersunk rivets. There are 120 degree heads out there too. Cheers Trevor Jones |
Countersunk screw-head diameter and angle
"Peter H." wrote:
... it could be 82 and 90 degrees, or it could be some other number ... Countersinks are made in 60, 82 and 90 degrees. Machine screws are 82 degrees. Specialty screws could be 90 degrees. There are also 100 deg flat head screws. I've used them. In sheat metal they are quite usefull. ( I have only used #6 and #8 I believe) ...lew... |
Countersunk screw-head diameter and angle
Peter H. wrote:
... it could be 82 and 90 degrees, or it could be some other number ... Countersinks are made in 60, 82 and 90 degrees. Machine screws are 82 degrees. Specialty screws could be 90 degrees. I have seen 60, 82 and 100 degrees but never 90. 100 degrees seems to be very common on rivets intended for sheet metal. Most machine and wood screws I've seen are 82 degrees. Also I have a couple of countersink tools from Boeing Surplus that takes a removable piloted bit and has a micrometer depth adjustment. I set it up on a piece of scrap and then countersink as many holes as I need very quickly. I could post a picture if it would help. Wonderfull gadget! Even gives me accurate countersinks when used in a hand held electric drill. Ted |
Countersunk screw-head diameter and angle
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