For something where brute strength is required (like an automotive frame), I would prefer a regular bolt, not countersunk. If I need either one of those, I switch to flat heads. Here's how I would choose: If centering or flush installation aren't required, I'd go with a cap screw by default. But if you need it to be flush, drilling a countersink is usually much easier than drilling a counter-bore.Ĭap screws can be installed in slots and flat heads can't (that I know of). A caps screw above the surface is the simplest mechanically. A cap head screw with an oversized hole can accommodate some misalignment without warping the parts being attached.Īlso adding to something others have mentioned. I find that this is usually an advantage, but it can also be a disadvantage. You can give the screw hole a generous clearance, and when the screw is tightened down, the parts will still be forced into alignment (in the plane perpendicular to the screw). They are self centering when used in a tapped hole. Click on a page number or the arrows to page forward and back.Counter sunk screws have an additional advantage that I haven't seen anyone mention. The number of pages will be displayed to the left of the Add All Selected Items button. To clear all filter selections, click on the Clear Filters button.Įven after filtering there may be several pages of items. It will appear at the top of the list in bold. To deselect a single filter option, click in the Select box and click on the selected option.So, try different combinations of filters like Size, Grade and Material to see matching Lengths and Finishes. Even though there are thousands of fasteners to choose from a particular material or finish may not be available in every size and length.Available options will be based on selections you've already made. Click in other Select boxes and make more choices.For example, you can select two sizes and 1 Selected will change to 2 Selected. You can select more than one item in each Select box. Click on the desired item and - Select - will change to 1 Selected.
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