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China Suppliers Marine Sealing Screws with Silicone O Rings M4 M5 M6 Stainless Steel 316 - Factory Direct

Introducing our high-quality sealing screws, designed to provide reliable protection against water and dust without the need for additional sealants. Each screw features a rubber ring pre-installed under the head, which compresses when tightened, ensuring a secure seal. With an impressive IP67/IP68 rating, these screws are perfect for various applications, Manufactured from premium materials such as 304 stainless steel, 316 stainless steel, or zinc plated finishes, our sealing screws are durable and built to last. Available in Phillips pan head, hex washer head, and hex socket styles, we offer sizes M4, M5, and M6 to meet your specific needs, As leading suppliers in China, our factory is committed to delivering top-notch products that exceed industry standards. Enhance your projects with our exceptional sealing screws and experience unparalleled quality and performance

Product Details

Two screws. One keeps water out. The other does not.

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.

Where the gap goes

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.

The rubber ring does the job

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.

Head types – what each one does

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.

Rubber compounds

NBR: oil and grease.
Silicone: heat and cold.
EPDM: sun and weather.
FKM: chemicals and solvents.

Metal choices

304 stainless: general outdoor.
316 stainless: saltwater areas.
Zinc plated: indoor and budget jobs.

IP ratings

IP67: one meter of water for 30 minutes.
IP68: longer submersion.

Sizes & Uses

M4, M5, M6. Lengths 6mm to 30mm.
Common uses: Electrical boxes, Power meters, Marine gear, Car lights, Control panels.

Quick Reference – Which Sealing Screw For Your Job

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

Q&A

Q: What is the biggest advantage of sealing screws? A: No sealant needed. Drive them in and they seal themselves.

Q: Can I use one type of sealing screw everywhere? A: You can, but you get better results if you match the rubber and metal to your environment.

Q: Are all sealing screws waterproof? A: Only if they have a rubber seal under the head. That is what makes them sealing screws.

Q: What happens if I over-tighten a sealing screw? A: The rubber compresses too much and may deform. Tighten until the head sits flush. Do not overdo it.

Q: Do you stock all sizes? A: M4, M5, M6 are in stock. Other sizes available on order.

Company Profile

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.

Need sealing screws? Send us your drawing or sample. Tell us size, material, and quantity. We will reply within 24 hours. OEM and custom orders welcome.

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