- What does #12-24 mean?
- It is a #12 diameter screw with 24 threads per inch, a fine pitch for its size. That gives more turns per inch and better holding in thin metal than a coarse thread.
- Will these work in wood?
- Machine screws are made for tapped metal holes or nuts, not wood. In wood they hold poorly unless you use a threaded insert or a nut on the back.
- Can I drive them with a drill?
- A flat-blade bit in a drill works, but the single slot slips easily. Keep the clutch low and finish by hand to avoid chewing the slot.
- Are they rustproof?
- No. Zinc Cr+3 plating handles indoor damp and light wear, but it is not stainless. For outdoor or wet use, choose stainless steel screws.
- What is in the pack?
- 100 machine screws, #12-24 by 1-1/4 inch, slotted round head, zinc Cr+3, full thread. Nuts and washers are not included.
- How is this different from a pan head screw?
- A round head is domed and taller; a pan head is flatter with a wider bearing surface. Both sit above the surface, but the round head looks more traditional.
- Where is the #12-24 x 1-1/4 Slotted Round Head Machine Screws, Zinc Cr+3, Full Thread cheapest?
- At Industrial Maintenance Supply, for $15.59, as of our latest check.