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SS304/SS316L KF Half Nipple Stainless Steel L=20/30/40/50/70MM Vacuum KF/NW Socket Weld Flanges KF16-KF50 High Quality NW10-NW50 Vacuum Welded Fitting
SS304 SS316L Vacuum Half Nipple Weld Flange Stainless Steel Short/Long Weld Stub Flange Vacuum Fittings for Semiconductor
- Overview
- Recommended Products
Applications
KF flanges are a sexless design made from 304 stainless, they can be used in a wide range of applications including:
* Roughing and foreline plumbing
* Small pipe systems
* Systems need frequent cleaning or modification
* Research and teaching laboratories
Material and Size
* Flanges,Blanks,Fittings:Stainless Steel 304,316L or Aluminum
* Clamps:Aluminum or Stainless Steel 304
* O-Ring:Viton/NBR/EPDM
* Size:KF10-KF50(See Figure 1)
Vacuum Range
Elastomer Seal:>= 1 x 10-8 Torr
Temperature Range
Viton:-50°C to 200°C
NBR:-20°C to 80°C
Installation
The ISO-KF components are assembled by inserting a centering ring between the two flange faces, then securing the assembly with a flange encompassing clamp (see Figure 2)
Half Nipple Weld Flange
Material:SS304/SS316L
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| Model for 304 with C/mm | Size | A/mm | B/mm | Thickness | N.W./g | ||||||||||||||||||||||
| 20 | 30 | 40 | 70 | 20 | 30 | 40 | 70 | ||||||||||||||||||||
| FLW821K100504 | FLW831K100504 | FLW841K100504 | FLW871K100504 | KF10 | 30 | 12.7 | 1.65 | ||||||||||||||||||||
| FLW821K160754 | FLW831K160754 | FLW841K160754 | FLW871K160754 | KF16 | 30 | 19.1 | 1.65 | 25 | 32 | 40 | 47 | ||||||||||||||||
| FLW821K251004 | FLW831K251004 | FLW841K251004 | FLW871K251004 | KF25 | 40 | 25.4 | 1.65 | 37.5 | 51 | 59 | 71 | ||||||||||||||||
| FLW821K401504 | FLW831K401504 | FLW841K401504 | FLW871K401504 | KF40 | 55 | 38.1 | 1.65 | 59.3 | 81 | 94 | 112 | ||||||||||||||||
| FLW821K502004 | FLW831K502004 | FLW841K502004 | FLW871K502004 | KF50 | 75 | 50.8 | 1.65 | 121 | 144 | 156.7 | 189 | ||||||||||||||||
| FLW822K10D144 | FLW832K10D144 | FLW842K10D144 | FLW872K10D144 | KF10 | 30 | 14 | 2 | 28 | |||||||||||||||||||
| FLW822K16D204 | FLW832K16D204 | FLW842K16D204 | FLW872K16D204 | KF16 | 30 | 20 | 2 | 25 | 32 | 40 | 47 | ||||||||||||||||
| FLW822K25D284 | FLW832K25D284 | FLW842K25D284 | FLW872K25D284 | KF25 | 40 | 28 | 2 | 37 | 46.7 | 60 | 70 | ||||||||||||||||
| FLW822K40D454 | FLW832K40D454 | FLW842K40D454 | FLW872K40D454 | KF40 | 55 | 44.5 | 2.5 | 73.5 | 104 | 132 | 157 | ||||||||||||||||
| FLW822K50D544 | FLW832K50D544 | FLW842K50D544 | FLW852K50D544 | KF50 | 75 | 54 | 2 | 129 | 155 | 180 | 203 | ||||||||||||||||
| FLW822K50D574 | FLW832K50D574 | FLW842K50D574 | FLW872K50D574 | KF50 | 75 | 57 | 3.5 | 159 | 205 | 254 | 292 | ||||||||||||||||
About Us
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Wenzhou QiMing Stainless Co., Ltd. was founded in 2015, located in Wenzhou city providing a wide range of stainless steel valves and fittings for food, dairy, beverage,cosmetic, wine industries, semiconductor, LCD,solar energy, lithium technology, photovoltaic and other high-tech industries. mainly manufacture and export SS valves and fittings including Butterfly Valve, Ball Valve, Check Valve, Angle Valve, Vacuum Valves, Tri Clamp Fittings, Weld Fittings,KF/NW flanges, ISO Flanges and CF Flanges. has Mazak CNC, Milling CNC, handheld spectrometer,helium mass spectrometer leak detection, roughness tester and others. With more than 10 years development, QiMing gets 3A certificate and ISO9001:2008. QiMing's main market is Europen, USA, Korea,Japan and so on. |
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QiMing Market Our products are exported to many countries, including South Korea, the United States, the United Kingdom, ltaly, France, the Netherlands, Finland, Russia, Belarus, Thailand, CanadaMexico, Australia, Germany, Spain, Malaysia, Singapore, Vietnam, Indonesia, India, thePhilippines, Japan, Paraguay, Brazil, Chile, Peru, and more. |
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QiMing Team Our experienced engineers work closely with each customer to find out the best possible solutions.Our constant technical innovation combined with stringent quality control systems hasenabled us to deliver high performance and outstanding value in sanitary applications.We are dedicated to improving the performance and value of our products, services, and solutions to meet your requirements |
Equipment & Testing
QiMing has advanced CNC machieries,CNC centers and Testing Equipment,ISO9000 Certificated and all raw materials are traceablethe ablethe
Certificate
Exhibition
Wenzhou Qiming Stainless Steel Co., Ltd. participated in the Japan Semiconductor Exhibition in November 2023, the Shenzhen Semiconductor Exhibition in June 2024, and the U.S. Semiconductor Exhibition in July 2024. In December 2024, the company attended the Japan Semiconductor Exhibition again and participated in the China Optoelectronics Expo during the same period. It will take part in the China Optoelectronics Expo in September 2025, the U.S. Semiconductor Exhibition in October 2025, and the Japan Semiconductor Exhibition in November 2025.
FAQ
Q: Why Choose QiiMii Stainless?
QiiMii has over 15 years of manufacturing experience in stainless steel sanitary fluid and high-vacuum pipe fittings and valves.
As a benchmark factory in Wenzhou's stainless steel industrial cluster, we provide not only products but also "reliability" — from
material traceability (MTR) to 100% pressure and leak rate testing, ensuring every component performs stably in your systems
(semiconductor, biopharmaceutical, food processing). We also excel in production capacity, efficient management, accurate lead
times, on-time delivery, and problem-solving.
Q: What Is Your Main Product Range?
QiiMii mainly manufactures and exports stainless steel valves and fittings, including butterfly valves, ball valves, check valves,
angle valves, vacuum valves, clamp fittings, welded fittings, KF/NW flanges, ISO flanges, and CF flanges.
We accept customization based on product drawings, samples, and parameters.
Q: Which International Safety & Quality Standards Do Your Products Meet?
Safety and compliance are our foundation. Our products comply with the following certifications:
* Quality System: ISO 9001:2015 certified factory.
* Hygiene Standards: FDA certified seals, designed to 3A sanitary standards.
* Material Standards: Equipped with helium leak detectors, spectrometers, and vacuum leak detection equipment; material test
certificates are available.
* Testing Standards: All vacuum components are tested with a helium mass spectrometer leak detector.
Q: What Information Is Needed for a Formal Quotation?
To provide an accurate quotation, please supply:
* Product specifications: Standard (3A / DIN / SMS), size (1", DN25, KF25, etc.).
* Material: SS304 or SS316L.
* Technical parameters: Working pressure, temperature range, surface finish (Ra value).
* Order quantity: Sample order or bulk order.
We will confirm the technical proposal and issue a formal quotation within 24 hours.
Q: Why Is Your Quotation Sometimes Higher Than Ordinary Factories?
In the B-side industrial sector, "low price" often means "high risk". Our price includes:
* Raw material guarantee: No recycled materials; guaranteed qualified Ni and Cr content for SS316L.
* Precision machining: High-precision CNC equipment to ensure sealing surface flatness and tolerances.
* Strict quality inspection: Every pneumatic valve undergoes at least 50 cycles of operation and sealing tests before delivery.
Q: What Is Your Typical Lead Time?
We operate a "in-stock + customization" model:
* Standard / in-stock items: Shipped within 1–3 working days after order confirmation.
* Custom / bulk orders: Normally 15–25 working days.
* Urgent orders: If your production line is down and needs parts urgently, we can arrange priority production via our fast-track
channel.
Q: What Trade Terms and Payment Terms Do You Support?
We have complete global delivery capabilities:
* Trade terms: FOB (Ningbo/Shanghai), CFR, CIF. For small spare parts orders, we also provide DDP/DDU door-to-door service (by
air or express).
* Payment terms: T/T, L/C, Alibaba Trade Assurance.
Q: What Is the Process for Non-Standard Customization?
Our customization process is clear and transparent:
* Drawing confirmation: Customer provides CAD/PDF drawings; our engineers conduct technical review.
* Sampling phase: Samples provided within 7–10 days for customer validation.
* Mass production: After sample approval, sign a specification confirmation and start production.
* Laser marking: We will confirm whether you need your logo on the products. If required, please send the logo file and mark
position.
* Full inspection & shipment: 100% inspection on critical dimensions with test reports included in the shipment.
Q: How Do You Handle After-Sales Service and Installation Guidance?
* Technical support: 2D/3D model files are available for every order to support your system design.
* Remote guidance: For complex pneumatic / electric valves, we provide video call installation training and troubleshooting support.
