Sealing Screws
Self Sealing Screws Zinc Plated Hex Washer Head EPDM Washer For Outdoor Electrical Box Bulk Wholesale
Where do you need sealing screws?
| Application | What’s at risk | Our solution |
|---|---|---|
| Outdoor electrical enclosures | Rain, condensation, dust ingress | IP67/IP68 rated O-ring seal |
| Junction boxes & meters | Moisture causing short circuits | EPDM washer – weatherproof |
| Marine / boat equipment | Salt water corrosion | 316 stainless + silicone O-ring |
| Metal roofing | Leaks through fastener holes | Self sealing screw with bonded washer |
| Automotive lighting | Fogging inside lamp housings | Compression seal – stays tight |
| Industrial control panels | Dust and humidity | Pre-installed rubber gasket |
How does the seal work?
| Sealing type | How it works | Best for |
|---|---|---|
| O-ring seal | Rubber ring compressed between head and surface | General purpose, water and dust |
| EPDM bonded washer | Washer bonded to the head – cannot fall off | Outdoor, roofing, UV exposure |
| Silicone seal | Stays flexible from -50°C to +200°C | Extreme temperatures |
| FKM / Viton seal | Resists chemicals, oils, fuels | Harsh industrial environments |
| Nitrile (NBR) seal | Good oil resistance | Automotive, machinery |
Head styles available
- Phillips pan head – Standard. Works with any Phillips screwdriver. Good for most jobs.
- Hex washer head – Built-in flange. No separate washer needed. Wide clamping.
- Hex socket head – Allen key drive. For tight spaces and higher torque.
Materials we offer
| Material | Best for |
|---|---|
| 304 stainless steel | Outdoor, damp, general corrosion protection |
| 316 stainless steel | Marine, saltwater, chemical exposure |
| Zinc plated carbon steel | Indoor, light outdoor, budget friendly |
Sizes & strength
- Metric M4, M5, M6. Lengths 6–30 mm. Custom sizes available.
- Strength: Class 8.8, 10.9, 12.9.
Quality assurance
ISO 9001 and ISO 10012 certified. Every batch inspected. O-rings tested for retention and sealing performance.
Custom orders
Need a different head, seal material, or non-standard length? Send us your drawing. We make exactly what you need. OEM orders welcome.
About YH Fastener
Since 1998. We produce sealing screws, self tapping screws, machine screws, shoulder screws, and custom fasteners. Factory direct. Ship to 60+ countries.
- Pre-installed rubber O ring or sealing washer
- No extra sealant needed – just tighten
- IP67 and IP68 waterproof ratings
- Phillips pan head, hex washer head, hex socket head
- NBR, silicone, EPDM, FKM rubber options
- 304 stainless steel, 316 stainless steel, zinc plated
- Metric M4 M5 M6
| Attribute | Details |
|---|---|
| Screw Type | Sealing Screws |
| Head Styles | Phillips Pan Head / Hex Washer Head / Hex Socket Head |
| Sealing Material | NBR / Silicone / EPDM / FKM |
| Materials | 304 Stainless Steel, 316 Stainless Steel, Zinc Plated Carbon Steel |
| Size | M4 M5 M6, Length 6mm to 30mm |
| Protection | IP67 / IP68 |
| Typical Use | Outdoor Enclosures, Junction Boxes, Marine Equipment, Metal Roofing |