# PTFE Tube Size Chart & Selection Guide 2025 > Selecting the correct PTFE tube size is critical for proper fit, flow rates, and system performance. This guide covers metric and imperial dimensions, wall thic Source: https://aftubes.com/blog/ptfe-tube-size-guide/ --- [Home](https://aftubes.com/)›[Blog](https://aftubes.com/blog)›PTFE Tube Size Chart & Selection Guide 2… Technical ## PTFE Tube Size Chart & Selection Guide 2025 ![Savio Pereira](https://aftubes.com/uploads/author-savio-pereira.webp) Savio Pereira Chemical Engineer · 18 years in fluoropolymer processing December 3, 2025 10 min read Selecting the correct PTFE tube size is critical for ensuring proper fit, achieving required flow rates, and maintaining system performance. This guide covers the key dimensional parameters, standard size ranges, wall thickness categories, and the application-specific size ranges most frequently specified across industries. ### Understanding PTFE Tube Dimensions Three measurements define a PTFE tube. Inside Diameter (ID) is the internal measurement controlling flow capacity and component compatibility. Outside Diameter (OD) determines fitting compatibility and space requirements. Wall Thickness (WT) is calculated as (OD – ID) ÷ 2, and directly governs pressure rating and flexibility. Always specify which dimension is critical for your fitting system: OD for compression fittings, ID for bore flow calculations. ### Wall Thickness Categories | Category | Wall Thickness | Typical Applications | | --- | --- | --- | | Thin Wall | 0.15–0.5mm | Medical devices, wire insulation, miniature instruments | | Standard Wall | 0.5–1.5mm | Laboratory equipment, analytical instruments, chemical transfer | | Heavy Wall | 1.5–3.0mm+ | High-pressure hydraulics, mechanical components, bushings | ### Standard Metric Size Reference | OD (mm) | ID (mm) | Wall (mm) | OD Tolerance | | --- | --- | --- | --- | | 1.0 | 0.5 | 0.25 | ±0.05 | | 2.0 | 1.0 | 0.50 | ±0.08 | | 3.0 | 2.0 | 0.50 | ±0.08 | | 4.0 | 3.0 | 0.50 | ±0.10 | | 6.0 | 4.0 | 1.00 | ±0.10 | | 8.0 | 6.0 | 1.00 | ±0.12 | | 10.0 | 8.0 | 1.00 | ±0.15 | | 12.0 | 10.0 | 1.00 | ±0.15 | | 16.0 | 13.0 | 1.50 | ±0.20 | | 20.0 | 17.0 | 1.50 | ±0.20 | | 25.0 | 22.0 | 1.50 | ±0.25 | ### Application Size Guidelines | Industry / Application | Typical ID Range | | --- | --- | | Laboratory and analytical equipment | 0.5–4mm ID | | Medical devices | 0.3–6mm ID | | Pharmaceutical fluid transfer | 4–16mm ID | | Chemical processing | 4–25mm ID | | Automotive and aerospace | 3–12mm ID | | Wire and cable insulation | By wire gauge (AWG/SWG) | Ordering Tip For compression fittings: specify OD as critical, allow ID to float within standard tolerance. For bore-flow applications: specify ID as critical, allow OD to float. For pressure-critical applications: specify both dimensions with an understanding that one will be held to tighter tolerance than the other. PTFE Tube Range [Natural PTFE Tube →](https://aftubes.com/ptfe-natural-tube)[Coloured PTFE Tube →](https://aftubes.com/ptfe-colored-tube)[Corrugated PTFE Tube →](https://aftubes.com/ptfe-corrugated-tube)[FEP Tube →](https://aftubes.com/fep-tube)[PFA Tube →](https://aftubes.com/pfa-tube) ![Savio Pereira](https://aftubes.com/uploads/author-savio-pereira.webp) Article by Savio Pereira Savio Pereira is a Chemical Engineer who has held leadership roles in companies like IBM. A passionate problem solver who thrives at finding solutions to engineering and business problems alike using simple innovative ideas. He believes in doing things differently rather than doing different things. His vision is to make Advanced Fluro (P) Ltd the most valuable company in the fluouro polymer industry. In This Article Have a Technical Question? Our engineering team advises on material selection, specifications, and your specific application. Contact Technical Team WhatsApp Us Related Articles [PTFE TubingThe Ultimate Guide to Thin Wall PTFE Tubing Dimensions and Tolerances10 min read](https://aftubes.com/blog/thin-wall-ptfe-tubing)[PTFE TubingPTFE Lined Tubing vs. Full PTFE Tubing: Cost and Performance Analysis8 min read](https://aftubes.com/blog/ptfe-lined-tubing-vs-full-ptfe-tubing)[TechnicalPTFE Medical Tubing: The Complete Guide for Pharmaceutical Applications9 min read](https://aftubes.com/blog/ptfe-medical-tubing) Advanced Fluro Private Limited ### Need Technical Guidance? Our engineering team advises on material selection, specifications, and application requirements across all fluoropolymer products. [Request a Quote](https://aftubes.com/contact)[WhatsApp](https://wa.me/919699055600)