Metallics JRWS29M 10 x 1-1/4 in. Round Washer Head Combo Sharp Point Tapping Screws - Steel Zinc - Each

That is the job it is built for. The round washer head gives a wide bearing surface so it won't pull through sheet metal flanges or the mounting ears on a box, and the sharp point starts in wood or light-gauge steel without a pilot hole. At 1-1/4 inches of length, a #10 has enough reach for a box flange or bracket into a stud. It is catalogued as an electrical fastener by Metallics.

The JRWS29M is steel with a zinc plating, which is a mild indoor corrosion coating. Fine for interior framing, panel rooms, drop ceilings and dry utility spaces. For exterior, wet locations or treated lumber, go with a stainless or hot dip galvanized fastener instead, since zinc plating will bloom and then rust in those conditions.

The JRWS29M takes either a Phillips or a square drive bit, which is what "combo" means on this screw. Handy on a crew where one guy runs a #2 Phillips and another runs a square drive insert bit, since both seat in the same recess.

No. Sharp point means the screw forms its own thread as it drives, so it starts in wood, particle board, drywall and thin sheet metal without pre-drilling. If you are fastening into heavier gauge steel, you want a self-drilling point screw instead, not a sharp point.

Yes, the JRWS29M is US made. That matters if you are bidding public or institutional work with domestic sourcing language in the spec.

No, they are not interchangeable. The round washer head on the JRWS29M sits on top of the material and will not sit flush, so anywhere a finished flush surface or a countersunk hole is called for you need a flat head screw. Use the washer head where you want clamping area over a slot, flange or oversized hole.

They ship in a jar, which is the handy pack for a van or a shop bench, you can scoop a handful without a box tearing open. Useful if you are standardizing a truck stock on one #10 x 1-1/4 washer head screw.