Description

USA Lab KF25 Bellows Hose – Rated for Full Vacuum | USA Lab

The USA Lab KF25 Bellows Hose is engineered for maximum flexibility and reliability in high-vacuum service. Precision-formed stainless-steel convolutions provide superior vibration isolation, misalignment tolerance, and durability under extreme vacuum conditions.

Each hose is helium leak-tested and designed for full vacuum performance—ideal for connecting vacuum pumps, traps, and chambers where clean, contamination-free operation matters.

Standard KF25 (NW25) quick-clamp flanges enable fast installation with centering rings and clamps, streamlining maintenance without tools.

Built for labs, pilot plants, and semiconductor/analytical environments that demand dependable foreline plumbing.

Full Vacuum Rated KF25 / NW25 304 SS

Full Vacuum: Performance suitable to 10⁻⁶ Torr when properly integrated.

Fast Assembly: KF25 quick-clamp connection with centering ring for tool-free changes.

Flexible & Robust: Corrugated stainless bellows absorb vibration and route tight bends.

Why buy from USA Lab

Expert Support
Engineers & technicians on staff.

Quality First
Tested and trusted products.

Fast Fulfillment
Nationwide 1-2 day shipping.

Warranty & Parts
US-based service & spares.

Why this KF25 Bellows Hose?

Ultimate vacuum rating — engineered for deep-vac service to 10⁻⁶ Torr (system-dependent).
Flexible & durable — stainless convolutions resist fatigue and allow tight routing without collapse.
Clean operation — smooth internal surfaces minimize outgassing and particle shed.
KF25 simplicity — quick-clamp assembly with standard centering rings for fast changeovers.
Helium leak-tested — quality-checked for reliable, contamination-free connections.

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Get help selecting length, material (304 vs 316L), and ring/clamp options for your setup.

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Technical Specifications

Model	USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum
Connection Size	KF25 (NW25) quick-clamp
Standard	ISO-KF
Material	304 Stainless Steel (optional 316L available)
Pressure / Vacuum	Full vacuum capability < 1 micron; suitable to ~10⁻⁶ Torr (system-dependent)
Temperature Range	−40 °C to +200 °C
Lengths Available	250 mm – 2000 mm
Typical Applications	Foreline plumbing, vacuum pumps, traps, chambers; analytical & semiconductor processes; research labs
Cleanliness	Cleanroom-compatible design; low outgassing
Assembly	Use with KF25 centering ring and clamp (sold separately)

Popular Industries & Use Cases

Vacuum Systems Analytical Instruments Semiconductor Academic & Research

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Custom Solutions

Tailored tanks, skids, and integration help.

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FAQ

What does KF25 / NW25 mean on the USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum?

KF25 (also called NW25) is the ISO-KF quick-flange size used on the USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum, allowing tool-free assembly with a centering ring and clamp.

Is the USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum compatible with my existing KF hardware?

Yes. The USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum follows ISO-KF standards and works with standard KF25 clamps and centering rings.

What vacuum level can the USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum handle?

When properly integrated, the USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum supports deep-vac environments to approximately 10⁻⁶ Torr (system-dependent).

What temperatures can the USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum withstand?

The USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum is suitable from −40 °C to +200 °C.

Important Shipping Notice for USA Lab KF25 Bellows Hose – Rated for Ultimate Vacuum

DISCLAIMER:

All items are carefully packaged to ensure safe delivery. In the rare event that your item arrives damaged, please notify us within 3 days of receipt. We will promptly provide a replacement or issue a refund.

Please note that any damage occurring after delivery is not covered under warranty. We appreciate your understanding and your trust in our products.

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Specifications

Brand:	USA Lab
Warranty Term:	1 Year
Lead Time:	1–3 Days
Return Window:	30 days

Warranty

Fittings and steel do NOT carry any warranty. Fittings and steel items with a defect or other issue must be identified within 30 days of arrival and USA Lab MUST be contacted. After 30 days, there will be no replacements sent for fittings or steel items with a defect or issue. Cross threading, misuse, improper storage, or improper care of fittings/steel are considered user error and are not covered under warranty.

Shipping & Returns

1–3 Business Days Standard Processing

Return Policy ↗ Varies by Product Warranty Policy ↗ Varies by Product

3 Days to Claim Inspect on Arrival

Shipping

Orders ship within 1–3 business days after payment clears. We ship Monday through Friday via UPS, USPS, and freight carriers.
Freight items (crated, hazmat, dropship, or special packaging) can take 1–5 business days to ship.
Expedited shipping speeds up transit, not processing. Contact us for true rush orders.
PO Box addresses ship USPS. Alcohols, chemicals, and hazmat cannot ship to a PO Box.

Full Shipping Policy

Delivery & Damage Claims

Inspect every shipment on arrival. Claims must be filed within 3 business days.
Visible damage? Refuse the delivery and have the driver document it. We will file the claim and ship a replacement.
Concealed damage: contact us within 2 days with photos of the packaging and item. Keep all packing materials.
Freight services (liftgate, residential, inside delivery) are the customer's responsibility to select for their location.

Damage & Freight Details

Returns

USA Lab branded products are returnable within 30 days of order date with prior authorization. Email us before sending anything back.
Solvents, chemicals, and consumables are not returnable once shipped. Custom and made-to-order items are final sale.
Unused items in original packaging carry a 15% restocking fee. Defective items ship back on us.
Items showing any signs of use, wear, contamination, or modification are not eligible for return.
Glassware damage must be reported within 3 business days of delivery for replacement or refund.

Full Return Policy

Custom & Made-to-Order Items

Customized and made-to-order products are final sale and not eligible for return under any circumstances.
This includes ductless fume hoods, configured tanks and reactors, and any item built to your specifications.
These products are manufactured specifically for your application. Confirm sizing, voltage, and configuration with our team before ordering.
Damage claim coverage still applies. Inspect on arrival and report issues within 3 business days.

Return Eligibility Details

Warranty

USA Lab products are covered against manufacturing defects for up to 3 years, depending on product line.
1 year: chillers, heaters, rotovaps, reactors, vacuum ovens, mixers, and most equipment. 2 years: UVP vacuum pumps. 3 years: scientific freeze dryers.
Wear items (glassware, gaskets, heating elements, sensors) and fittings/steel are not covered. Report defects within 30 days (3 days for glass).
Non–USA Lab brands are covered by their manufacturer's warranty. See the product's Warranty tab.

Full Warranty Policy

International Orders

Import duties, taxes, VAT, and brokerage fees are not collected by USA Lab and are the receiver's responsibility.
Verify your country's customs charges and import restrictions before ordering.
Refused or unclaimed international shipments are refunded minus shipping and a 15% restocking fee.
International orders are generally non-returnable. Damaged items must be reported within 3 business days.

International Guidelines

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Summaries above are provided for convenience. The full Policies & Warranty Info pages govern all orders and may be updated at any time.

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