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China Suppliers Factory Hex Head Sealing Screw with Pre-Installed Washer for Automotive, Marine & Outdoor Applications
Hex head sealing screws come with a rubber O ring pre installed in a precision machined groove under the hex head. When tightened with a wrench the hex head design allows for high torque application ensuring the O ring compresses fully against the mating surface to create a complete watertight seal.
These self sealing bolts are ideal for underground electrical enclosures, water treatment facilities, marine equipment, automotive exterior lighting, and industrial junction boxes that require IP68 rated protection against prolonged water immersion.
The hex head design provides excellent grip for power tools and wrenches making installation quick and secure. No separate sealing washer or liquid sealant is needed which reduces assembly time and eliminates mess.
Available in stainless steel 304 for maximum corrosion resistance or galvanized carbon steel for cost effective outdoor use. O ring materials include NBR for general purpose, silicone for wide temperature range, and Viton for chemical resistance.
Standard metric thread sizes M4 M5 M6 with custom lengths available upon request. Bulk orders welcome with factory direct pricing.
Our company is an ISO 9001 certified fastener manufacturer with over 10 years of export experience. Every batch undergoes 100% thread gauging and O ring integrity inspection before shipping.
Product Highlights
Hex head design allows high torque tightening with wrench
Pre installed rubber O ring for IP68 waterproof protection
No separate sealing washer or sealant needed — saves assembly time
Available in stainless steel 304 or galvanized carbon steel
Perfect for underground electrical enclosures and marine equipment
Product Detail
Section 1: General
Screw Type: Hex Head Sealing Screw
Drive Type: Hex Wrench / Socket Driver
Head Style: External Hexagon
Drive Type: Hex Wrench / Socket Driver
Head Style: External Hexagon
Section 2: Material
Screw Material: Stainless Steel 304 / Galvanized Carbon Steel
O Ring Material: NBR / Silicone / Viton
Surface Finish: Plain / Zinc Plated
O Ring Material: NBR / Silicone / Viton
Surface Finish: Plain / Zinc Plated
Section 3: Dimensions
Thread Size: M4 / M5 / M6
Length Range: 10mm to 50mm
Length Range: 10mm to 50mm
Section 4: Performance
Waterproof Rating: IP68
Temperature Range: -20°C to 120°C
Corrosion Resistance: Excellent
Temperature Range: -20°C to 120°C
Corrosion Resistance: Excellent
Section 5: Applications
Typical Use: Underground Electrical Enclosures
Industry: Marine / Automotive / Industrial
Industry: Marine / Automotive / Industrial
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Frequently Asked Questions
Q
What is a hex head sealing screw and how does it work?
A hex head sealing screw is a fastener with a pre-installed rubber O ring seated in a precision machined groove beneath the hex head. When tightened using a wrench or socket driver, the O ring compresses evenly against the mating surface, forming a complete watertight and airtight seal without the need for additional sealants or washers.
Q
What waterproof rating do these sealing screws achieve?
These hex head sealing screws are rated IP68, meaning they provide full protection against prolonged water immersion. They are suitable for demanding environments including underground electrical enclosures, marine applications, and outdoor industrial equipment.
Q
What materials and O ring options are available?
The screws are available in stainless steel 304 for superior corrosion resistance or galvanized carbon steel for a cost-effective outdoor solution. O ring materials include NBR for general purpose sealing, silicone for wide temperature range applications (-20°C to 120°C), and Viton for environments requiring chemical resistance.
Q
What thread sizes and lengths are available?
Standard metric thread sizes M4, M5, and M6 are available with length options ranging from 10mm to 50mm. Custom lengths can be arranged upon request, and bulk orders are welcomed with factory direct pricing.
Q
Do I need a separate sealing washer or liquid sealant when using these screws?
No. The O ring is pre-installed in the machined groove and compresses automatically during tightening. This eliminates the need for separate sealing washers or liquid sealants, simplifying the assembly process, reducing component costs, and ensuring a consistent seal every time.
Q
What quality certifications does the manufacturer hold?
The manufacturer is ISO 9001 certified with over 10 years of export experience. Every production batch undergoes 100% thread gauging and O ring integrity inspection prior to shipment, ensuring consistent quality and reliability for every order.