Kunshan Xinzhenpin New Thin Film Material Technology Co LTD.
| Packaging Details | Small orders by express; bulk orders by FCL sea freight. |
| 90° Peel Strength | ≥ 15 N/25mm |
| Waterproof Rating | IP68 |
| Moisture Vapor Transmission Rate | 8,000 – 18,000 g/m²·24h |
| Size | Customizable |
| Material Compliance | PFAS Free |
| Supply Ability | Monthly Output: 300,000 sqm |
| Thickness | 0.10 – 0.50 mm |
| Chemical Resistance | Corrosion-resistant，Acid-resistant |
| Payment Terms | T/T |
| Color | White |
| Water Entry Pressure | ≥ 400 kPa |
| Operating Temperature | -40°C to +150°C |
| Oleophobicity Grade | ≥ 7 |
| Delivery Time | 15 working days |
| Air Permeability | Gurley：3 – 30 s/100ml @ 300 ml |
| Brand Name | OEM/ODM |
| Model Number | OEM/ODM |
| Certification | IATF16949/ISO |
| Place of Origin | China |
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Product Specification
| Packaging Details | Small orders by express; bulk orders by FCL sea freight. | 90° Peel Strength | ≥ 15 N/25mm |
| Waterproof Rating | IP68 | Moisture Vapor Transmission Rate | 8,000 – 18,000 g/m²·24h |
| Size | Customizable | Material Compliance | PFAS Free |
| Supply Ability | Monthly Output: 300,000 sqm | Thickness | 0.10 – 0.50 mm |
| Chemical Resistance | Corrosion-resistant，Acid-resistant | Payment Terms | T/T |
| Color | White | Water Entry Pressure | ≥ 400 kPa |
| Operating Temperature | -40°C to +150°C | Oleophobicity Grade | ≥ 7 |
| Delivery Time | 15 working days | Air Permeability | Gurley：3 – 30 s/100ml @ 300 ml |
| Brand Name | OEM/ODM | Model Number | OEM/ODM |
| Certification | IATF16949/ISO | Place of Origin | China |
| High Light | Stainless Steel Breather Bolt Vent ，IP68 Transmission Differential Vent ，Threaded Vent Plug | ||
IP68 Stainless Steel Breather Bolt Vent For Transmission Differential
This IP68 stainless steel breather bolt vent is built to survive extreme drivetrain conditions. The vent body is machined from 304 stainless steel, and the core ePTFE membrane offers waterproof and dustproof pressure equalization. Designed for manual transmissions, differentials, and transfer cases, it prevents oil seal failure and water ingress during off-road water crossings. The all-metal construction resists impact, road debris, and aggressive gear oils.
Transmissions and differentials generate significant frictional heat during operation. When a hot metal housing is suddenly submerged in cold water during off-road driving, the internal air cools and contracts violently, creating a strong vacuum. This vacuum can pull muddy water past axle seals and gaskets, contaminating the gear oil. Even without submersion, sealed housings that cannot vent build up pressure and push lubricant past oil seals, causing external leaks.
A stainless steel breather bolt with an IP68-rated ePTFE membrane replaces the solid fill plug or is installed at the highest point of the housing. It continuously equalizes pressure during heating and cooling cycles, reducing stress on seals. The hydrophobic membrane blocks water, silt, and dust even under full immersion. Stainless steel construction provides corrosion resistance against brine and acidic off-road mud, ensuring reliable operation for tens of thousands of miles.
Ideal for off-road vehicle differentials, manual and automatic transmission housings, transfer cases, and heavy-duty planetary gearboxes. Also used in marine stern drives, industrial gear reducers, and agricultural machinery where high shock and mud exposure are expected.
The bolt is threaded into a pre-tapped port on the housing. As the gear oil heats up, expanded air passes through the ePTFE membrane to the atmosphere. When rapid cooling occurs, air returns through the membrane while water is stopped at the surface. The large stainless steel body acts as a heat sink, reducing the chance of membrane icing in freezing conditions and maintaining airflow channels clear of congealed oil mist.
Select the correct thread type and pitch matching your housing port. For competition off-road vehicles, consider extending the breather with a remote tube adapter; this bolt can serve as the base with a push-in hose fitting. Verify the maximum continuous temperature rating exceeds your housing peak temperature; 200°C covers most synthetic gear oil applications.
A: Yes, but ensure it is installed above the static fluid level and not in the fluid stream. It is designed for the air space in the housing.
A: 304 stainless offers good resistance to saltwater spray. For continuous immersion, consider periodic fresh water rinsing to avoid crevice corrosion.
A: Never paint over the membrane surface. You can mask the cap and paint the hex body only to match the housing color.
Company Details
Business Type:
Manufacturer,Exporter
Year Established:
2018
Total Annual:
1,000,000-2,000,000
Employee Number:
30~50
Ecer Certification：
Verified Supplier
Kunshan Xinzhenpin New Thin Film Material Technology Co., Ltd. Established in 2018, Kunshan Xinzhenpin is a specialized manufacturer dedicated to ePTFE waterproof and breathable membrane solutions. We operate a fully integrated production chain covering ePTFE raw membrane manufacturing, composite a... Kunshan Xinzhenpin New Thin Film Material Technology Co., Ltd. Established in 2018, Kunshan Xinzhenpin is a specialized manufacturer dedicated to ePTFE waterproof and breathable membrane solutions. We operate a fully integrated production chain covering ePTFE raw membrane manufacturing, composite a...
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