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Introduction to Stainless Steel Flex Hoses, Formed & Welded Bellows

Key High's Stainless Steel Flexible Hose Connectors are ideal as expansion joints and address alignment issues. These hoses help absorb and reduce vibration when rigid tubing is not an option. Usually, these hoses are used for setting up forelines, or as gas delivery lines. Flanges on these hoses are manufactured from 304L/316L stainless steel. Standard end connections offered are KEY SPEEDY NW & ISO flanges, Met-Seal UHV Flanges, VCR® Fittings, Swagelok® fittings, Compression Fittings and Tube Ends.

Stainless Steel "Gas Flex" Braided Hoses

Key High's "Gas Flex" Braided Hoses are flexible stainless-steel hoses used in high vacuum and gas distribution applications.  Key High offers this series of hoses in 1/4", 3/8", and ½" ID. "Gas Flex" Series Hoses allow users to route the hose as needed for their unique situation, allowing a clean installation of the gas transport lines. Hoses are constructed from a fully annealed type 321 stainless steel sheet, rolled into a tube, and seam welded. Swagelok® and VCR® fittings are 316L stainless steel.

General Installation Guidelines

Extension of 20% and a compression of 30% from the free length for unbraided hoses. Due to the braid installation, braided hose assemblies cannot extend or be compressed. Hoses with braid will lose some lateral flexibility (approximately 25%). The braid prevents the hose from squirming when used in positive pressure applications.

Quality

All assemblies are TIG welded, then leak tested at 2x10-9 std cc/sec of He.

Options

Key High has an extensive selection of the most common hose lengths and flanges. Upon request, nearly any length can be fabricated to fit unique requirements.

 

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Technical Data

NOMINAL HOSE ID NOMINAL HOSE OD STATIC MINIMUM BEND RADIUS STATIC MAXIMUM WORKING PRESSURE @70°F (PSIG) DYNAMIC MINIMUM BEND RADIUS DYNAMIC MAXIMUM WORKING PRESSURE 70°F (PSIG) BURST PRESSURE 70°F (PSIG)
1/4" 0.39" 0.35" 390 N/A N/A N/A
1/4" w/ Braid 0.45" 0.75" 4800 5.5 2030 11165
3/8" 0.63" 0.55" 170 N/A N/A N/A
3/8" w/ Braid 0.7" 1.14" 3700 6 1450 8000
1/2" 0.73" 0.83" 130 N/A N/A N/A
1/2" w/ Braid 0.79" 1.34" 2900 4.88 1160 6100
 
Installation Precautions
  1. Do not subject any metal hose to gas surges larger than 50% of the rated working pressure (this will shorten the life of the hose).
  2. Avoid torsional twisting of the hose. Torsional twisting is harmful to the hose and will significantly reduce its service life.
  3. Stay within the recommended bend radius. If a metal hose is bent beyond its rating, fatigue will occur, and premature failure can result. This typically occurs near the end connections.

Product information is subject to change without notice. Product images may include options or accessories not included with the base model.
Key High Vacuum Products, Inc.
Key High
36 Southern Boulevard 11767 Nesconset, NY
1-631-360-3970
sales@keyhigh.com
1-631-360--3970

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