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High Vacuum Flange Stainless Steel SS304 SS316L CF 90 Degree Elbow Rotatable Bend CF16-CF100 Flange Thru Holes 3/4"-4" Pipe Fittings
High Vacuum SS304 SS316L CF 90 Degree Elbow Rotatable CF16-CF100 Stainless Steel Rotatable Bend Flange Thru Holes Pipe Fittings
- Overview
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CF FLANGE SERIES
CF flanges are available with tapped or untapped holes. Tapped flanges are available in UNCUNf or metric threads. Tapped tlanges have through holes, so bolts may protrude slightly from the back of the flange when fastened to an untapped flange. Untapped Cf flanges can be fastened to each other with stainless steel bolts and hex nuts or plate nuts. Plate nuts center themselves over two adjacent holes and can be held in place with one finger while the bolts are tightened. They are avallable for most flange sizes from 1 1/3 to 10 inch (33.96-254mm) ODs. As an alternative to hex head bolts, 12-point bolts are available for CF flanges from 2 3/4 to 10 inch (33.96 to 354mm) ODs. Silver plated bolts eliminate the need for anti-seize compoundin clean room environments.
ASSEMBLY INSTRUCTIONS FOR CF FLANGES
1. Apply a small amount of high temperature anti-seize compound to the bolt threads
2. Check that both flange surfaces are clean and sealing edges are free from nicks and scratches.
3. Using clean, lint free gloves, unpack gasket.
4. Place gasket in the knife edge counterbore of nonrotatable flange.
5.Align the mating hole pattern and leak test grooves.
6. Install the proper bolts and tighten hand tight. Check to see that the flange faces are parallel.
7. Tighten the bolts 1/4 to 1/2 turns using a star pattern until the flange faces are metal to metal.
8. Torque the fasteners to the listed value using the same pattern.
* U.S. manufacturers of CF flanges name them according to their outer diameter measured in inches i.e. a CF600 flange has an outer diameter of approximately 6 inches.
* European identification for these flanges is expressed in a variety of ways; the flange outer diameter is measured in millimeters or the flange inner diameter counterbore (the area machined to accept tubing for welding)is measured in. millimeters or the inner diameter of the largest through bore is measured in millimeters. Measurements are rounded to the nearest millimeter for naming purposes.
* U.S. and Metric CF flanges are compatible. The only difference in design is that metric flanges have a metric bolt thread machined into tapped bolt holes. QiMing can provide both metric tapped flanges on request.
| U.S.Flange Size | DIN Standard | European Sizes | Flange Outer Dia | |
| Inch | Millimeter | |||
| CF133 | DN16 CF | CF16 | 1.33" | 33.8 |
| CF212 | CF25 | 2.12" | 53.8 | |
| CF275 | DN35 CF | CF35 | 2.75" | 70 |
| CF275 | CF40 | 2.75" | 85.7 | |
| CF338 | CF50 | 3.38" | 114.3 | |
| CF450 | DN63 CF | CF63 | 4.5" | 117.5 |
| CF462 | CF80 | 4.62" | 152.4 | |
| CF600 | DN100 CF | CF100 | 6" | 203.2 |
| CF675 | CF130 | 6.75" | 254 | |
| CF800 | DN150 CF | CF160 | 8" | 304 |
| CF1000 | DN200 CF | CF200 | 10" | 336.6 |
| CF1200 | DN250 CF | CF250 | 12 | 355.6 |
| CF1325 | CF270 | 13.25" | 419.1 | |
| CF1400 | DN300 CF | CF300 | 14" | 355.6 |
| CF1650 | DN350 CF | CF350 | 16.5" | 419.1 |
CF 90° Elbows
*Material:SS304/SS316L
| Model for 304 | Size | Type | Range D (Inch/mm) | A/mm | Tube Size | N.W. (g) |
|---|---|---|---|---|---|---|
| FEG01H1F160754 | CF16-3/4" | Thru Holes | 1.33/33.8 | 38 | 3/4" | |
| FEG01H1F251004 | CF25-1" | Thru Holes | 2.12/53.8 | 58 | 1" | |
| FEG01H1F351504 | CF35-1.5" | Thru Holes | 2.75/70 | 63 | 1.5" | |
| FEG01H1F502004 | CF50-2" | Thru Holes | 3.38/85.7 | 80 | 2" | |
| FEG01H1F632504 | CF63-2.5" | Thru Holes | 4.5/114.3 | 105 | 2.5" | |
| FEG01H1F803004 | CF80-3" | Thru Holes | 4.62/117.5 | 118 | 3" | |
| FEG01H1F1004004 | CF100-4" | Thru Holes | 6/152.4 | 135 | 4" |
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.
