Super Flangeless

Idex superflangeless Fittings

IDEX Super Flangeless Fittings

IDEX Super Flangeless fittings are a rugged, flat-bottom connection system designed for high-pressure chromatography and instrument plumbing where reliability matters. These fittings help create consistent, repeatable seals while reducing common issues like loosening caused by tubing twist—making them a strong choice for tubing assemblies, service work, and applications exposed to vibration.

  • High-pressure flat-bottom performance for demanding LC connections
  • Helps prevent loosening that can occur from tubing rotation during tightening
  • Ideal for tubing assemblies and repeatable connections across instruments
  • Stays tight under vibration to reduce leaks and re-tightening

Chrom Tech is an authorized distributor of IDEX fittings and offers Super Flangeless components to help you build leak-free connections with confidence—whether you’re replacing a single nut or configuring a complete, standardized fitting setup.

Tech Tip: Make sure the locking ring is oriented correctly. The flattened end of the ring should face the nut, and the narrow end of the ferrule should face toward the ring.

PART NO DESCRIPTION
PORT
PRESSURE RATING
HEAD STYLE
MATERIAL
Ferrules for 1/32", 1/16", 1/8", 3/16", 1/8 mm, 2.0 mm, 2.5 mm
M-250 Ferrule for 1/16" OD Tubing 10-32 Flat-Bottom 1,000 – 5,000 PSI – PEEK Natural/SST
M-650 Ferrule for 1/16" OD Tubing 6-32 or 6-40 Flat-Bottom 750 – 3,750 PSI – PEEK Natural/SST
P-248 Ferrule for 1/32" OD Tubing 10-32 Flat-Bottom 2,500 PSI – ETFE Green/SST
P-250 Ferrule for 1/16" OD Tubing 1/4-28 or M6 Flat-Bottom 2,500 PSI – PEEK Natural/SST
P-259 Ferrule for 1/16" OD Tubing 1/4-28 or M6 Flat-Bottom 1,350 PSI – ETFE Yellow/SST
P-260 Ferrule for 1/16" OD Tubing 1/4-28 or M6 Flat-Bottom 1,850 PSI – PEEK Natural/SST
P-350 Ferrule for 1/8" OD Tubing 1/4-28 Flat-Bottom 2,500 PSI – PEEK Natural/SST
P-352 Ferrule for 1/16" OD Tubing 1/4-28 or M6 Flat-Bottom 2,500 PSI – PEEK Black/SST
P-355 Ferrule for 1.8 mm OD Tubing 1/4-28 or M6 Flat-Bottom 2,500 PSI – PCTFE Green/SST
P-357-2 Ferrule for 2.0 mm OD Tubing M6 Flat-Bottom 5,000 PSI – PEEK Natural/SST
P-359 Ferrule for 1/8" OD Tubing 1/4-28 Flat-Bottom 1,000 PSI – ETFE Yellow/SST
P-360 Ferrule for 1/8" OD Tubing 1/4-28 Flat-Bottom 1,500 PSI – PEEK Natural/SST
P-366 Ferrule for 2.5 mm OD Tubing 1/4-28 Flat-Bottom 1,000 PSI – PEEK Natural/SST
P-140 Ferrule for 3/16" OD Tubing 5/16-24 Flat-Bottom 500 PSI – ETFE Green/SST
6-40 and 6-32 fittings for 1/16" OD tubing
M-660 Nut for 1/16" OD Tubing 6-32 Flat-Bottom 750 – 3,750 PSI Micro Headless PEEK Natural
M-644-03 Nut for 1/16" OD Tubing 6-40 Flat-Bottom 750 – 3,750 PSI Micro Headless PEEK Green
10-32 fittings for 1/16" OD tubing
M-652 Nut for 1/16" OD Tubing 10-32 Flat-Bottom 1,000 – 5,000 PSI 1/4" Hex PEEK Green
M-653 Nut for 1/16" OD Tubing 10-32 Flat-Bottom 1,000 – 5,000 PSI Headless Knurl PEEK Green
M-655 Nut for 1/16" OD Tubing, Long 10-32 Flat-Bottom 1,000 – 5,000 PSI 1/4" Hex PEEK Green
One-piece super flangeless for 1/16" and 1/8" OD tubing
P-229 Fitting for 1/16" OD Tubing M6 Flat-Bottom 1,000 PSI Standard Knurl PEEK
P-249 Fitting for 1/16" OD Tubing 1/4-28 Flat-Bottom 1,000 PSI Standard Knurl PEEK
P-329 Fitting for 1/8" OD Tubing M6 Flat-Bottom 1,000 PSI Standard Knurl PEEK
P-349 Fitting for 1/8" OD Tubing 1/4-28 Flat-Bottom 1,000 PSI Standard Knurl PEEK
M6x1 fittings for 1/16" and 1/32" OD tubing
P-213 Nut for 1/16" or 1/32" OD Tubing, Short M6 Flat-Bottom * Headless Knurl PEEK Black
P-217 Nut for 1/16" or 1/32" OD Tubing M6 Flat-Bottom * Standard Knurl PPS Black
P-219 Nut for 1/16" or 1/32" OD Tubing, Short M6 Flat-Bottom * Standard Knurl PEEK Black
M6x1 fittings for 1.8 mm, 2.0 mm, 2.5 mm, 1/8" OD tubing
P-317 Nut for >1/16" – ≤1/8" OD Tubing M6 Flat-Bottom * Standard Knurl PPS Black
P-319 Nut for 1/8" OD Tubing, Short M6 Flat-Bottom * Standard Knurl PEEK Black
P-357 Nut for 2.0 mm OD Tubing M6 Flat-Bottom * Standard Knurl PEEK Black, Natural SST
1/4-28 fittings for 1/16" and 1/32" OD tubing
F-356 Nut for 1/16" or 1/32" OD Tubing, FlushNut 1/4-28 Flat-Bottom * FlushNut SST
LT-105 Nut for 1/16" or 1/32" OD Tubing, Short 1/4-28 Flat-Bottom * 1/4" Hex SST
LT-115 Nut for 1/16" or 1/32" OD Tubing, Short 1/4-28 Flat-Bottom * Standard Knurl PEEK Natural
P-232 Nut for 1/16" or 1/32" OD Tubing, Short 1/4-28 Flat-Bottom * Headless Knurl PEEK Natural
P-246 Nut for 1/16" or 1/32" OD Tubing 1/4-28 Flat-Bottom * Standard Knurl PFA Natural
P-252 Nut for 1/16" or 1/32" OD Tubing 1/4-28 Flat-Bottom * Standard Knurl Delrin® Gray
P-255 Nut for 1/16" or 1/32" OD Tubing 1/4-28 Flat-Bottom * Standard Knurl PEEK Natural
P-281 Nut for 1/16" or 1/32" OD Tubing 1/4-28 Flat-Bottom * Standard Knurl PPS Natural
P-287 Nut for 1/16" or 1/32" OD Tubing 1/4-28 Flat-Bottom * Headless Knurl PPS Natural
P-420 Nut for 1/16" or 1/32" OD Tubing, Female 1/4-28 Flat-Bottom * Female Knurl PEEK Natural
1/4-28 fittings for 1.8 mm, 2.5 mm, 1/8" OD tubing
C-235 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * 1/4" Hex SST
F-156 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * Female Knurl PEEK Black
F-364 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * FlushNut SST
LT-210 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * Double Wings PEEK Natural
LT-215 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * Standard Knurl PEEK Natural
P-331 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * Standard Knurl PEEK Natural
P-332 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * Standard Knurl Delrin Black
P-336 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * Standard Knurl PEEK Natural
P-381 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * Headless Knurl PPS Natural
P-387 Nut for 1/8" OD Tubing 1/4-28 Flat-Bottom * Female Knurl PPS Natural
5/16-24 fittings for 1/16", 1/8", 3/16" OD tubing
P-131 Nut for 1/8" OD Tubing 5/16-24 Flat-Bottom * Standard Knurl PEEK Natural
P-137 Nut for 3/16" OD Tubing 5/16-24 Flat-Bottom * Standard Knurl PEEK Black
P-141 Nut for 1/16" OD Tubing 5/16-24 Flat-Bottom * Standard Knurl PEEK Natural
*Pressure rating of nut depends on the ferrule used.
Key Definitions ▸
Super Flangeless Fitting
A high-pressure flat-bottom fitting system engineered to prevent tubing twist and maintain consistent, repeatable seals in chromatography systems.
Locking Ring
A retention component used in Super Flangeless assemblies that stabilizes the ferrule and prevents fitting rotation during tightening.
Flat-Bottom Port
A port design with a flat sealing surface where the ferrule compresses to create a high-integrity seal.
Tubing Assembly
A pre-configured length of tubing equipped with fittings on one or both ends for fast installation and repeatable performance.
Vibration Resistance
The ability of a fitting system to maintain sealing force in environments where mechanical movement or pump pulsation is present.
Ferrule Orientation
The correct alignment of the ferrule and locking ring that ensures optimal sealing and prevents premature wear or leaks.
Frequently Asked Questions ▸
What makes Super Flangeless different from standard flangeless fittings?
Super Flangeless fittings use a locking ring design that prevents tubing rotation, improving seal consistency and reducing loosening over time.
Are these fittings suitable for high-pressure LC systems?
Yes. Super Flangeless fittings are designed specifically for high-pressure chromatography applications.
Do these fittings work with tubing assemblies?
Yes. They are ideal for pre-built tubing assemblies and repeatable installations across multiple instruments.
How do I orient the locking ring correctly?
The flattened end of the locking ring should face the nut, while the narrow end of the ferrule faces the ring.
Can these fittings withstand vibration?
Yes. Super Flangeless fittings are designed to stay tight under vibration and pump pulsation.
Does Chrom Tech stock these fittings?
Yes. Chrom Tech is an authorized distributor and stocks a wide range of Super Flangeless fittings for fast delivery.