Stainless Steel Cap Head Sealing Screws With O Ring Waterproof Fastener
This fastener is one we quote quite often. There is an O-ring tucked right beneath its cap head. A lot of our repeat buyers just call it an O ring sealing screw. Once you torque it down properly, the rubber ring gets compressed flat against the mounting face. That is how the seal forms. We machine each cap head sealing screw in our own workshop. It keeps damp air, mist and fine dust from creeping inside device housings. View full specs of our cap head sealing screw here：cap head sealing screw
✓ Things buyers like about these screws
- The O-ring comes pre-installed. It will not fall off while workers fit parts. You skip the extra hassle of lining up loose gaskets one by one, which helps cut assembly time
- Hex socket works with standard hex keys. Torque control is straightforward. It is also simple to remove the screw if later service is needed
- SUS304 and SUS316 stainless steel are our top stocked grades. Customers pick these two for outdoor or damp locations, mainly for good rust resistance
- Standard batches meet IP65 sealing level. We ship them out for electrical cabinets, sensors, junction boxes and marine hardware projects
- Our available sizes cover M2 all the way to M24. We also make custom versions based on client drawings. One customer from Germany told us the pre-sealed design saves them plenty of rework on site
Specification Table
| Item | Parameter |
|---|---|
| Head Type | Cap Head (Socket Hexagon) |
| Drive Type | Hex Socket |
| Material | SUS304, SUS316, Carbon Steel |
| Seal Part | NBR / Viton O-ring |
| Thread Standard | Metric M2-M24 |
| Surface Treatment | Passivation, Zinc plating, Black oxide |
| Sealing Rating | IP65 |
Where our clients put this waterproof screw
Most orders of this cap head sealing screw go into electronic enclosures, power boxes, outdoor LED lights, communication modules and sensor casings. Designers choose this fastener because circuit boards inside need protection. Rain, fog and floating dust can easily damage sensitive electronics. If your working spot runs hot or has regular oil splashes, we can swap to Viton O-rings. They hold up far better against oil and chemical exposure.
Custom work for non-standard designs
We get many requests for special sealing fasteners from industrial buyers. Ready stock sizes do not always fit unique housing layouts. Send over your drawing, or even a physical sample if you have one. Our shop can adjust head thickness, thread length, O-ring dimension and surface coating. Small trial orders are acceptable for new product validation.
About YH Fastener
We are a fastener manufacturer based in China. Our shop produces security screws, captive screws, sealing screws and various custom bolts. Before packing any batch for shipment, our staff carry out visual checks plus random leak tests. We try our best to keep quality steady shipment after shipment. Many partners stick with us for repeated orders year over year.
Drop us a message for quotation
FAQ
Q1: What sets sealing screws apart from regular socket cap screws?
A1: A sealing screw has a built-in O-ring under the cap to block water and dust. Normal screws only clamp parts together without sealing function.
Q2: What O-ring material options do we have?
A2: NBR works well for most common environments. Go for Viton when the part meets high heat, oil or chemicals.
Q3: Can we adjust thread length for small sizes such as M3, M4, M5?
A3: Yes, custom thread length is available across all metric sizes M2 to M24.
Q4: What sealing rating do these cap head sealing screws reach?
A4: Standard finished products reach IP65. Reach out if you need higher sealing grades for special projects.
Q5: Can I get samples to test first?
A5: We can supply small test samples. The buyer covers the shipping cost.
Q6: How long is lead time for custom sealing screw orders?
A6: Stock items ship within 3–5 working days. Non-standard custom orders usually take 7–15 working days.
