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Most sealing screws use a Phillips head. These use a hex socket. You drive them with an Allen key. Why does that matter? Because an Allen key goes straight in from the top. It does not need side clearance. In tight electrical boxes, that side clearance is exactly what you do not have. The Allen key also gives you more leverage. You can crank it down harder, which compresses the O ring more, which gives you a better seal.
There is a rubber O ring sitting in a groove under the head. When you tighten the screw, that ring gets squeezed between the head and the surface. The harder you tighten, the tighter the seal. By the time the head sits flush, the rubber has filled every gap.
NBR: handles oil. Good for engines and machinery.
Silicone: handles heat and cold. Stays flexible in both.
EPDM: handles sun and rain. Good for outdoor work.
FKM: handles chemicals. Use it where solvents are present.
304 stainless steel: does the job for most outdoor work.
316 stainless steel: is better near saltwater.
Zinc plated steel: is the budget pick. Good for indoor jobs.
IP67: means one meter of water for thirty minutes. No leaks.
IP68: means you can leave it underwater longer.
M4, M5, and M6. Lengths from 6mm to 30mm.
Tight enclosures. Junction boxes. Marine gear. Control panels. Automotive lights. Anywhere you need a seal and you are short on space.
We check every O ring before packing. Every batch tested. ISO 9001 and ISO 10012 certified.
An Allen key. Size matches the socket, not the head.
Yes. The O ring seals it when tightened.
One meter of water for thirty minutes. No leaks.
Yes. Use stainless steel. 316 is better near saltwater.
No. The O ring does the job.
Yes. Rubber bounces back. Use them several times.
YH Fastener has been making screws and fasteners since 1998. We produce hex socket sealing screws, self tapping screws, machine screws, shoulder screws, and custom fasteners. ISO 9001 and ISO 10012 certified. We inspect every batch before shipping. Factory direct. We ship to over 60 countries worldwide.
