Hiya B-A. Not a lot of people realise it any more but an engineering countersink is generally 90° (BSW, metric, etc), a wood screw countersink should be 102° (or flatter) to sink the screw properly (assuming it's a traditional screw)
Hiya B-A. Not a lot of people realise it any more but an engineering countersink is generally 90° (BSW, metric, etc), a wood screw countersink should be 102° (or flatter) to sink the screw properly (assuming it's a traditional screw)
Yep. I've seen it on boats where people have replaced British brass or bronze screws with American Robertson (squate drive) self-tapping type screws which never bed properly in the countersink because they are engineering screws.
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