1/4-20 Pan head phillips drive machine screws. Stainless steel machine screws provide excellent corrosion resistance and are the work horse for modern boatbuilding or exterior woodworking applications. Sold in boxes of 100. Pan head means flat top with smooth rounded sides to provide flat bearing surface under the head to allow for lateral movement (as opposed to a Flat or Oval Head screw that has a countersunk bearing surface that will self-center in the mounting holes).
These Stainless Steel Machine Screws are perfect for the marine environment. There are also a million other interior and exterior uses where a stainless fastener will come in handy. Designed for harsh environments.
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MET / STD:
Are these 316 or 305 SS?
I don't know what you mean .
How wide is the screw head?
The 1/4X20 S.S. machine screws I have are 7/16"=0.4375 . I hope this helps! John
Hi Brian,About 1/2".Doris
The diameter of the screw head is 0.466 inch (close to 15/32").
The head on the 1/4-20 S/S Machine Screw has roughly a 1/2 in dia.
The head of the screw measures 1/2 inch in diameter.
Screwy Problems solved
I need to be more selective when choosing alloys. I should have used 316 stainless in a number of places as I saw rust fom 304 or 318.
These bolts were very compatable with the nuts I purchased. I was quite satisfied, and I would recommend this product to anyone in need of 1/4-20 Pan head phillips drive machine screws.