Idex VHP Fittings

VHP Fittings

IDEX Very High Pressure (VHP) Fittings

Chrom Tech offers a full selection of IDEX Very High Pressure (VHP) fittings engineered for extreme pressure and temperature chromatography applications. Manufactured from a proprietary PK polymer blend, these fittings outperform standard PEEK by delivering superior pressure tolerance and thermal stability—making them ideal for demanding UHPLC and capillary LC workflows.

VHP one-piece fittings are available for 10-32 coned, 6-32 coned, and M4 coned ports, while two-piece VHP fittings support both 1/16" and 1/32" OD tubing with 10-32 coned connections. This flexible platform allows users to configure systems for analytical, microflow, and capillary-scale separations.

VHP MicroFerrules

VHP MicroFerrules are constructed from a high-performance PK polymer blend that enables reliable use of capillary tubing in UHPLC environments. Available for 1/32" and 360 µm OD tubing, these ferrules are incorporated across multiple VHP products to support precise, low-dead-volume connections for microflow applications.

Reusable VHP Fittings

IDEX Reusable VHP fittings are capable of up to ten repeat assembly cycles with no loss in pressure integrity or chromatographic performance. Because the system utilizes a polymer front ferrule, there is no damage to tubing or receiving ports—extending component lifespan and reducing replacement costs.

Stainless Steel VHP Fittings

Stainless Steel VHP fittings feature a unique dual-compression ferrule design that delivers exceptional grip without collapsing tubing ID. For 1/16" OD tubing with 10-32 coned ports, the ferrule is two-piece. For 1/32" OD tubing with M4 coned ports, the design uses a one-piece ferrule that provides two compression zones during tightening—ensuring reliable sealing and long-term performance.

Chrom Tech is an authorized distributor of IDEX VHP fittings and stocks a wide range of configurations for fast shipment. Contact our technical team for help selecting the right fitting based on tubing size, port geometry, solvent compatibility, and operating pressure.

Tech Tip: While PK polymer fittings provide higher pressure capability than standard PEEK, some molded PK components can be electrically conductive. Use caution when employing VHP fittings in high-voltage applications. MicroFerrules are port-specific and not interchangeable, and one-piece MicroTight fittings should not be mixed between different port types.

PART NO DESCRIPTION PORT PRESSURE REQUIRED TORQUE HEAD STYLE MATERIAL
PK VHP One-Piece Fittings
PK-120BLK PK One-Piece Fitting for 1/16" OD Tubing 10-32 Coned 12,000 PSI 8.0 in-lbs (0.90 N·m) Standard Knurl PK
PK-124 PK One-Piece Fitting for 360 µm OD Tubing 6-32 Coned 15,000 PSI 3.0 in-lbs (0.34 N·m) Standard Micro Knurl PK
PK-126H PK One-Piece Headless Fitting for 1/32" OD Tubing 6-32 Coned 15,000 PSI 3.0 in-lbs (0.34 N·m) Headless Micro Knurl PK
PK-126 PK One-Piece Fitting for 1/32" OD Tubing 6-32 Coned 15,000 PSI 3.0 in-lbs (0.34 N·m) Standard Micro Knurl PK
PK VHP Fittings (LiteTouch® Style, Nuts and Ferrules Sold Separately)
PK-100X PK Ferrule for 1/16" OD Tubing 10-32 Coned 16,500 PSI — — PK
PK-110X PK Nut for 1/16" OD Tubing 10-32 Coned 16,500 PSI 8.0 in-lbs (0.90 N·m) Standard Knurl PK
PK-132 PK Ferrule for 1/32" OD Tubing 10-32 Coned 16,500 PSI — — PK
PK MicroFerrules and Female Nuts
P-416 Ferrule Nut for MicroFerrule 5/16-24 Coned 15,000 PSI 4.0 in-lbs (0.45 N·m) Female Knurl PEEK, Natural
P-416BLK Ferrule Nut for MicroFerrule 5/16-24 Coned 15,000 PSI 4.0 in-lbs (0.45 N·m) Female Knurl PEEK, Black
PK-112 VHP MicroFerrule for 1/32" OD Tubing 5/16-24 Coned 15,000 PSI — — PK
PK-152 VHP MicroFerrule for 360 µm OD Tubing 5/16-24 Coned 15,000 PSI — — PK
Reusable VHP Fittings
VHP-320 VHP Fitting for 1/16" OD 10-32 Coned 25,000 PSI (1,720 bar) 10 in-lbs (1.10 N·m) 1/4" Hex SST/PK
VHP-321 VHP Fitting for 1/16" OD 10-32 Coned 25,000 PSI (1,720 bar) 10 in-lbs (1.10 N·m) 8 mm Hex SST/PK
VHP-325 VHP Fitting for 1/16" OD, Long 10-32 Coned 25,000 PSI (1,720 bar) 10 in-lbs (1.10 N·m) 1/4" Hex SST/PK
VHP-326 VHP Fitting for 1/16" OD, Long 10-32 Coned 25,000 PSI (1,720 bar) 10 in-lbs (1.10 N·m) 8 mm Hex SST/PK
VHP-900 VHP Fitting for 1/32" OD M4 Coned 30,000 PSI (2,070 bar) 20 in-lbs (2.25 N·m) 4 mm Hex SST
VHP-3200 VHP Fitting for 1/16" OD 10-32 Coned 11,000 PSI (760 bar) 3.5 in-lbs (0.40 N·m) 1/2 Knurl SST/PK
Stainless Steel VHP Fittings (Includes Nut and Ferrule)
VHP-200 VHP Fitting for 1/16" OD 10-32 Coned 30,000 PSI (2,000 bar) 20 in-lbs (2.25 N·m) 1/4" Hex SST
VHP-205 VHP Fitting for 1/16" OD, Long 10-32 Coned 30,000 PSI (2,000 bar) 20 in-lbs (2.25 N·m) 1/4" Hex SST
VHP-900 VHP Fitting for 1/32" OD M4 Coned 30,000 PSI (2,000 bar) 20 in-lbs (2.25 N·m) 4 mm Hex SST
Stainless Steel VHP Ferrules
VHP-200-01 VHP Ferrule for 1/16" OD 10-32 Coned 30,000 PSI (2,000 bar) 20 in-lbs (2.25 N·m) — SST
VHP Tightening Tools
VHP-1000 VHP Torque Tool, torque delivered: 10 in-lbs (1.13 N·m) — — — 1/4" Hex —
VHP-2000 VHP Torque Tool, torque delivered: 14 in-lbs (1.58 N·m) — — — 1/4" Hex —
Key Definitions â–¸
VHP (Very High Pressure) Fittings
Specialized fluidic fittings engineered to withstand extreme operating pressures and elevated temperatures in UHPLC and capillary LC systems.
PK Polymer
A proprietary high-performance polymer blend used in IDEX VHP fittings that delivers higher pressure tolerance and improved thermal stability compared to standard PEEK.
MicroFerrule
A precision-engineered ferrule designed for capillary tubing (1/32" and 360 µm OD) used in VHP microflow and UHPLC applications to ensure low dead volume connections.
Two-Piece Fitting
A fitting design that uses a separate nut and ferrule, allowing the ferrule to be replaced independently to extend component lifespan and reduce cost.
One-Piece Fitting
An integrated nut-and-ferrule design that simplifies installation and reduces the number of components required for high-pressure connections.
Dual Compression Zone
A sealing mechanism that applies pressure at two points on the tubing to improve grip, prevent slippage, and maintain consistent sealing under extreme pressure.
Coned Port
A port geometry featuring a tapered sealing surface that allows the ferrule to form a high-pressure seal directly against the cone.
Frequently Asked Questions â–¸
What applications are IDEX VHP fittings designed for?
VHP fittings are engineered for UHPLC, capillary LC, microflow LC, and other high-pressure analytical systems where leak-free performance and minimal dead volume are critical.
What pressure ratings can VHP fittings handle?
Depending on configuration, IDEX VHP fittings can withstand significantly higher pressures than standard PEEK fittings and are suitable for extreme-pressure UHPLC workflows.
What tubing sizes are supported?
VHP fittings are available for 1/16" and 1/32" OD tubing as well as 360 Âµm capillary tubing, depending on the fitting style.
What is the difference between one-piece and two-piece VHP fittings?
One-piece fittings integrate the nut and ferrule for faster installation, while two-piece fittings allow the ferrule to be replaced separately for cost savings and extended component life.
Are VHP MicroFerrules interchangeable between ports?
No. VHP MicroFerrules are port-specific and should not be interchanged between different port geometries to ensure proper sealing performance.
Are VHP fittings reusable?
Yes. Many VHP fittings are designed for multiple reassembly cycles with no loss in pressure-holding performance when installed correctly.
Is PK polymer conductive?
Some PK polymer formulations may exhibit conductivity. Use caution when employing these fittings in high-voltage or electrically sensitive applications.