Self Sealing O-Ring Screws | Waterproof Sealing Screws Factory & Supplier China

If you’re looking for consistent waterproof fastening for outdoor cabinets, sanitary gear or electronic housings, our o-ring self sealing screws deliver steady sealing performance with tight size tolerances. We’re a China-based sealing screw manufacturer with years of production and export experience, carrying both off-the-shelf standard sizes and fully custom sealing fasteners for different project needs.

Unlike regular screws that require extra sealing washers or on-site glue application, each of our self-sealing machine screws has a precision-machined annular groove under the head to lock the rubber O-ring firmly in place — no slipping or shifting during installation. When tightened down, the O-ring compresses evenly to fill the gap between the screw head and workpiece, reaching IP65 to IP67 dust and water resistance. This all-in-one design cuts out separate sealing parts, streamlines your assembly line and lowers your overall component costs.

Material & Seal Ring Options

We stock three core base materials with multiple surface finishes, paired with different seal compounds to match your working environment:

• Stainless Steel (304 / 316): The go-to pick for outdoor and humid settings. Our 304 grade passes 120 hours of neutral salt spray testing for regular outdoor use; 316 grade holds up over 200 hours, making it suitable for coastal, marine and light chemical exposure projects.
• Carbon Steel: High tensile strength at a lower cost, ideal for indoor and light moisture applications. Finishes include blue white zinc, color zinc, black zinc and nickel plating to match different corrosion and appearance needs.
• Brass: Non-magnetic with good electrical conductivity, mostly ordered for electrical terminals and bathroom hardware fixtures.

Seal ring materials are selectable based on your use case: food-grade silicone for -40℃ to 200℃ temperature ranges, NBR nitrile rubber for oil-resistant scenarios, and EPDM for long-term outdoor weather exposure.

Available Sizes & Head Types

We cover all mainstream metric sizes and head styles to fit different installation setups:

• Standard sizes run from M2, M2.5, M3, M4, M5 to M6, with lengths from 6mm up to 50mm. M3 and M4 sealing screws are our fastest-moving lines, with regular stock on hand for quick dispatch.
• Head options include pan head, countersunk flat head, socket cap head and hex head. Socket cap head sealing screws with silicone o-rings are especially popular for equipment enclosures and deep-hole mounting.
• We also make tamper-proof countersunk sealing screws with pin-in Torx drives for public facilities and anti-theft installations.

Typical Application Scenarios

Our sealing screws are regularly used across industries that require dust and water ingress protection:

• Outdoor LED lighting fixtures, solar junction boxes and photovoltaic mounting brackets
• Bathroom hardware, shower assemblies and kitchen sanitary ware
• Outdoor electrical cabinets, junction boxes and communication base station equipment
• Automotive waterproof components and marine equipment parts
• Plastic electronic housings and waterproof sensor devices

Custom & Wholesale Service

As an established sealing screws factory in China, we offer flexible ordering for both small batch buyers and large volume clients:

• Stock items: MOQ starts at 100 pieces, mixed sizes are allowed for trial orders. Most standard specifications can be arranged for shipment within 3 working days.
• Custom orders: We support custom sizes, special head shapes, non-standard seal materials and custom surface finishes. Sample production takes 5 to 7 days, and mass production runs 15 to 20 days for regular orders.
• Full OEM/ODM service is available — we can work from your drawings, physical samples or even just basic size and application requirements.

Every production batch goes through in-house inspection before leaving the factory, including 100% thread go/no-go gauge testing, random sampling for sealing performance, and full dimension verification. We can provide RoHS and REACH documentation for European and North American orders.

About YH Fastener

YH Fastener is a China-based fastener manufacturer focused on sealing screws, self-tapping screws, machine screws and a full range of standard and custom fasteners. We supply to hardware distributors, assembly factories and engineering clients across over 40 countries, with most standard sizes kept in warehouse for fast dispatch.

We run full in-house production lines and handle every step in-house — from raw material incoming checks to final pre-shipment sealing performance sampling. This lets us keep consistent size tolerance and reliable fastening quality across every batch. We accept both small trial orders and large bulk purchases, and can produce custom parts based on your drawings or physical samples. Our focus is straightforward: delivering dependable, cost-effective fastener solutions with stable lead times and clear after-sales support for every client.

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