I have a bracket that currently fastens using a pair of 3/8-16 flat head socket cap screws with what is presumed to be the standard 82 degree taper, so the bolt holes on the bracket are countersunk. I need to mount a spacer to the face of the upper bolt hole, and need a flush/flat surface to do so. Is there a name or standard for a conical washer that is used to fill a countersink (green portion of very rough attached sketch)? I would prefer to find an off the shelf solution before having to machine one, and have only been able to locate finishing washers, spherical washers (such as those for rod end misalignment), or washers that are countersunk on top rather than flush. Any help would be much appreciated!
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Washer to fill a countersink? 1
- Thread starter Mr168
- Start date
Compositepro
Chemical
Taper the end of your spacer in a lathe to match the countersink.
- Thread starter
- #3
BridgeSmith
Structural
If you only need a few, it should be a simple enough matter to get a few flat head bolts of the right size, and drill through the heads.
Rod Smith, P.E.
Rod Smith, P.E.
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1
- #10
Mr168:
Why not braze the hole full, or some such, then drill it open again to the right dia. Why not drill it open to a slightly larger dia. and use a larger screw for your new fixings. The only issue should be that you provide some bearing area (bearing dia.) for the screw near the faying surface, then use a slightly heavier (thicker) washer to bridge any remaining countersink space. That bracket certainly can’t be carrying much in the way of loading.
Why not braze the hole full, or some such, then drill it open again to the right dia. Why not drill it open to a slightly larger dia. and use a larger screw for your new fixings. The only issue should be that you provide some bearing area (bearing dia.) for the screw near the faying surface, then use a slightly heavier (thicker) washer to bridge any remaining countersink space. That bracket certainly can’t be carrying much in the way of loading.
Do you need a seal? If not, don't worry about it. If you do, then put a neoprene or rubber washer the thickness equal to the depth of the countersink and crank it down. It will mold to seal.
You could also drill out the countersink taper to create a flat land for the socket screw.
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You could also drill out the countersink taper to create a flat land for the socket screw.
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