Super Flangeless 1/4-28UNF Fittings Kit – Natural PP Material, Reliable Low-Pressure Connections for Lab & Analytical Instruments

In the field of precision fluid control, choosing fittings that are easy to install, chemically resistant, and cost-effective is crucial. Today we highlight the Super Flangeless 1/4-28UNF Fittings Kit, specially designed for low-pressure gas and liquid systems. It has been widely adopted in biochemical analysis, water quality testing, cell culture, and many other applications.

Key Specifications

• Material: Natural PP (polypropylene) body + optional PTFE ferrule
• Thread: 1/4-28UNF (American Unified Fine Thread, flat-bottom)
• Compatible Tubing OD: 1.6 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.175 mm (1/16") rigid tubing & PTFE tubing
• Color Options: Translucent natural, blue, yellow (customizable — blue and yellow are great for color-coding different lines to avoid mix-ups)
• MOQ: Only 5 pieces, unit price clearly listed
• Also available in full PTFE material or M6 thread version

Why Choose Flangeless Design? Traditional fittings require specialized tools to flange the tubing, which is cumbersome and single-use. This Super Flangeless fitting uses a classic two-piece design (nut + ferrule). No tools needed — simply slide the ferrule onto the tube and hand-tighten the nut for a secure, leak-free seal. Reusable after disassembly, it significantly reduces consumable costs, perfect for labs that frequently change tubing. For best results, cut the tube square and add an extra 1/4 turn after snug.

Excellent Temperature & Chemical Resistance

• High-temperature sterilization: >120℃, no deformation at 150℃ without external force
• Low-temperature embrittlement: below -20℃
• Resistant to acids, alkalis, salts, alcohols, phenols, aldehydes, ketones, and most organic solvents

These properties make it ideal for everyday lab use, such as low-pressure sections of HPLC systems, environmental monitoring instruments, ink delivery systems, pressure calibration equipment, and more.

Typical Applications

• Biochemical analysis and cell culture equipment (autoclavable, no metal ion release)
• Water quality analysis and environmental monitoring instruments (easy multi-line switching)
• Inkjet printing and ink supply systems (solvent-resistant, no clogging)
• Thermal engineering, refrigeration, low-pressure gas-liquid control
• Teaching, scientific research, dental diagnostic equipment
• Fluid pathways in precision scientific instruments

Appearance & Quality Control Smooth surface, free of burrs, flash, or obvious deformation — meticulous workmanship guarantees reliable sealing every time.

Buying Notes

• Price is per piece, MOQ 5 pieces
• Contact us directly if you need detailed engineering drawings
• Inquire about PTFE material version or M6 thread version

If you're looking for economical, durable, and easy-to-install 1/4-28UNF flangeless fittings or polypropylene flangeless fittings kit, this Super Flangeless series is definitely worth considering. Feel free to leave a comment or send us a direct message — we'll provide quotes and sample support as soon as possible.