Product Name
Vacuum Centering Ring — KF / NW (ISO-KF), SS304, KF16–KF50
Product Summary
SS304 stainless steel KF (NW) vacuum centering ring — the inner ring that sits between two KF quick-flanges to center the bore and carry the seal. CNC machined, sizes KF16, KF25, KF40 and KF50.
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ISO 9001 · CE · Manufacturer since 1999
Product Description
A KF (NW) centering ring machined from SS304 stainless steel — the inner ring of a KF quick-flange vacuum fitting. It sits between two KF quick-release flanges, centers the bore, and holds the seal in its groove so a KF clamp can pull the joint tight into a vacuum connection.
Available in KF16, KF25, KF40 and KF50. Working on a vacuum line? See our vacuum valves range, including KF-flange vacuum ball valves.
Specifications
| Item | Detail |
| Material | SS304 stainless steel |
| Standard | KF / NW (ISO-KF) quick-flange vacuum fitting |
| Part | Centering ring (inner metal ring) |
| Function | Centers the bore between two KF flanges and carries the seal |
| Sizes | KF16 (NW16), KF25 (NW25), KF40 (NW40), KF50 (NW50) |
| Manufacture | CNC machined |
Manufactured under our ISO 9001 quality system.
FAQ
What is a KF centering ring for? It sits between two KF (NW) flanges on a vacuum line, centers the bore so the two sides line up, and holds the seal in place so a KF clamp pulls the joint tight.
What sizes are available? KF16, KF25, KF40 and KF50 (also written NW16, NW25, NW40, NW50).
Are KF and NW the same thing? Yes. KF (Kleinflansch) and NW (Nennweite) are two names for the same ISO-KF quick-flange standard — KF25 and NW25 are the same size.
What material is it? SS304 stainless steel, CNC machined.
Do you also supply KF clamps and flanges? Tell us what your vacuum line needs when you request a quote and we will confirm what we can supply.
What is the minimum order? No minimum order quantity — we accept orders of any size, including small trial orders. For small orders, freight is arranged and paid by the buyer. Payment is by T/T — 30% on order confirmation, 70% before shipment.
Sample Policy
We are happy to provide product samples for customers to evaluate quality or conduct testing. The process typically begins with a quotation based on the customer’s specifications.
If the pricing is acceptable, we can offer samples either free of charge or at a cost depending on the product type and availability.
Shipping fees are borne by the customer.
Order Process
After confirming the product requirements and other details with the customer, we will issue a Sales Confirmation for approval. Once confirmed, the customer is required to pay a 30% deposit to proceed with production.
When mass production is completed and the goods pass inspection, the customer must pay the remaining 70% balance before shipment is arranged.
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FAQ
A. How can I request a quote?
Please provide a detailed inquiry sheet including product specifications, materials, quantities, and any special requirements. We will offer a quotation based on your request.
B. What are your quotation terms?
Our quotations are typically based on FOB terms. However, we can also offer CFR, CIF, or other Incoterms upon request.
C. What is your Minimum Order Quantity (MOQ)?
We have no MOQ. We operate on a made-to-order basis and accept orders of any size — trial orders are welcome. For smaller orders, freight is arranged and borne by the buyer.
D. What are your payment terms?
By T/T – 30% down payment upon order confirmation, and 70% balance before shipment.
E. What is your lead time?
Lead time depends on order quantity and specifications. We will confirm the exact schedule when you request a quote.
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