Q: Do stainless steel screws rust?
No, the 316 stainless-steel #4 flat-head screws hold up against rust in coastal air and other persistently damp settings.
316 Stainless-Steel #4 Flat-Head Screws
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Sized to match our stainless-steel hardware, these screws are 316 stainless steel, offering excellent corrosion resistance, including in coastal applications.
They have well-defined threads, strong necks and a Phillips-drive head. The countersink angle is 90° for flush fitting with the chamfer angle commonly found on today's hardware.
Offered in packages of 25.
No, the 316 stainless-steel #4 flat-head screws hold up against rust in coastal air and other persistently damp settings.
Yes, 316 stainless steel tolerates the corrosive copper compounds in pressure-treated lumber far longer than a zinc-plated screw would.
Yes, this 316 grade is built for exterior and coastal exposure, conditions that would eventually corrode an ordinary fastener.
Not noticeably – 316 stainless is only weakly magnetic, unlike the carbon-steel screws it replaces.
| Materials | 316 stainless steel |
| Dimensions | #4 × 1/2", #4 × 3/4" or #4 × 1" |
| Includes | Flat-head screws |
| Package Quantity | Pack of 25 |
| Warranty | Lee Valley Satisfaction Guarantee |

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316 Stainless-Steel #4 Flat-Head Screws
Sized to match our stainless-steel hardware, these screws are 316 stainless steel, offering excellent corrosion resistance, including in coastal applications.
They have well-defined threads, strong necks and a Phillips-drive head. The countersink angle is 90° for flush fitting with the chamfer angle commonly found on today's hardware.
Offered in packages of 25.
Choose an option to view item availability.
Choose an option to view item availability.
Choose an option to view item availability.
Choose an option to view item availability.