Capillaries and Connectors

Agilent capillaries, fittings, and connectors are engineered specifically for Agilent HPLC systems to maintain a secure, leak-free flow path and protect the accuracy of your chromatographic results. Each HPLC capillary is manufactured using Agilent’s precision laser-welding process, producing perfectly flat, burr-free ends that eliminate capillary-induced dead volume and prevent unnecessary peak distortion.

Our selection includes high-quality loop capillaries designed for a wide range of autosampler volumes and workflows. Available in both stainless steel and PEEK to accommodate different pressure requirements, these Agilent loop capillaries deliver reliable, high-precision performance across Agilent 1200-series autosamplers and other compatible LC instruments.

As an authorized Agilent distributor, Chrom Tech supplies only genuine Agilent capillaries, fittings, and flow-path components—ensuring OEM-level quality, validated performance, and trusted compatibility with your HPLC system. You can purchase with confidence knowing every part meets Agilent’s stringent manufacturing standards and is supported by Chrom Tech’s knowledgeable technical team.

Genuine Agilent components from an authorized distributor.
Agilent HPLC Parts Finder Tool
Launch Tool
Identify verified Agilent-compatible LC pump, autosampler, and detector parts by selecting your instrument model.
Internal Diameter (mm) Color Code
0.015 Orange
0.025 Yellow
0.05 Beige
0.075 Black*
0.1 Purple
0.12 Red*
0.17 Green*
0.20 / 0.25 Blue
0.3 Grey
0.5 Bone White

*MP35N versions include an orange identifying stripe.

Key Description
WSwagelok + 0.8 mm Port id
SSwagelok + 1.6 mm Port id
MMetric M4 + 0.8 mm Port id
EMetric M3 + 1.6 mm Port id
USwagelok union
LLong
XExtra long
HLong head
GSmall head SW 4 mm
NSmall head SW 5 mm
FFinger-tight
V1200 bar
BBio
PPEEK
Frequently Asked Questions â–¶
What should I consider when selecting capillary tubing for my HPLC system?
Key factors include inner diameter (ID), length, material (stainless steel vs PEEK), and compatible fittings/connectors. Matching ID and length to instrument and column specifications helps minimize dispersion and preserve resolution.
Why are fittings and connectors so critical for HPLC capillary performance?
Fittings and connectors create the seal between tubing and hardware. Poor interfaces can introduce leaks and dead volume, causing pressure instability and reduced reproducibility. High-quality, zero-dead-volume connections help protect peak shape and analytical accuracy.
What’s the difference between stainless steel and PEEK tubing?
Stainless steel supports higher pressures and broad solvent compatibility. PEEK is flexible and biocompatible but typically has lower pressure limits—often preferred for bio and inert fluid paths.
Why buy from an authorized distributor like Chrom Tech?
Buying from an authorized distributor helps ensure genuine OEM parts with validated specifications, warranty support, and expert guidance—supporting instrument uptime and reliable results.