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Here is the difference. A regular screw leaves a tiny gap between the head and the surface. Water finds that gap. Dust finds it too. You have to add sealant to block it. Sealing screws have a rubber ring under the head. Tighten them and the ring squishes flat. The gap disappears. No sealant needed.
Regular screw heads sit against the surface but do not seal it. That gap is the problem. Sealing screws fix it with a rubber ring that fills the space when compressed.
No glue. No extra parts. Just a rubber ring. It sits in a groove under the head. When you tighten the screw, it gets squeezed against the surface. That is the seal.
Phillips pan head: the standard. Works with any Phillips screwdriver. Good for most jobs.
Hex washer head: has a flange built in. No extra washer needed. Good for wider clamping.
Hex socket head: takes an Allen key. Good for tight spots.
| Your condition | Recommended rubber | Recommended metal |
|---|---|---|
| Outdoor, rain, sun | EPDM | 304 stainless |
| Saltwater, boats | EPDM or silicone | 316 stainless |
| Oil, grease, engines | NBR | 304 stainless |
| Chemicals, solvents | FKM | 316 stainless |
| Indoor, dry areas | Any | Zinc plated |
| Extreme heat or cold | Silicone | 304 stainless |
YH Fastener has been making screws since 1998. We produce sealing screws, self tapping screws, machine screws, shoulder screws, and custom fasteners. ISO 9001 and ISO 10012 certified. Every batch inspected before shipping. Factory direct. We ship to over 60 countries.
