Pneumatic Push-In Tube Fittings 4–12mm – Straight Elbow Tee Male Thread Air Water Hose Quick-Connect

Description

Pneumatic Push-In Tube Fittings – 4–12mm OD, Multiple Types: Straight, Elbow, Tee & Male Thread

Complete range of push-to-connect pneumatic tube fittings in all standard configurations — straight union (PU), 90° elbow union (PV), equal tee (PE), and male thread straight (PC) — covering tube OD sizes from 4mm to 12mm. Push-in fittings allow tool-free tube connection: insert the tube into the collet and it locks automatically; press the release collar to remove. Used throughout pneumatic circuits for connecting tubing to cylinders, valves, manifolds, and other pneumatic components.

Fitting Type Reference

PU (Straight Union): Joins two tubes inline. For extending tube runs or repairing cuts.
PV (90° Elbow Union): Joins two tubes at 90°. For direction changes without bending the tube.
PE (Equal Tee): 3-way fitting. For branching one supply into two equal branches.
PC (Male Thread Straight): Tube on one end, male BSPT thread on the other. For connecting tubing to threaded ports on cylinders, valves, and equipment.
PL (90° Elbow Male Thread): Tube exits at 90° from the thread axis. For tight installations where a straight fitting would require excessive clearance.

Key Specifications

Tube OD: 4mm, 6mm, 8mm, 10mm, 12mm (select above)
Thread (where applicable): 1/8”, 1/4”, 3/8”, 1/2” BSPT
Body Material: POM acetal or PA66 nylon
Working Pressure: 0–1.0 MPa (0–145 PSI)
Temperature Range: 0°C to +60°C
Media: Compressed air, water, light non-corrosive fluids

Tube OD to Thread Size Matching Guide

4mm tube: Typically used with 1/8” BSPT ports
6mm tube: Typically used with 1/8” or 1/4” BSPT ports
8mm tube: Typically used with 1/4” or 3/8” BSPT ports
10mm tube: Typically used with 3/8” BSPT ports
12mm tube: Typically used with 3/8” or 1/2” BSPT ports
Multiple tube sizes can fit the same thread size. Always select the tube OD that matches your tubing, not just the port thread size.

Frequently Asked Questions

How do I select the correct fitting type for my application?

Identify the connection point: (1) Tube-to-tube inline → PU straight union. (2) Tube direction change → PV elbow union. (3) One supply to two branches → PE tee. (4) Tube to threaded port, straight exit → PC male thread. (5) Tube to threaded port, 90° exit → PL elbow male thread. For cylinder and valve port connections, PC or PL are the most common — use PL when the cylinder is mounted close to a panel or wall and a straight fitting would require the tube to make a tight bend immediately after the port.

What is the minimum bend radius for pneumatic tubing?

Minimum bend radius for nylon (PA) pneumatic tube: approximately 8× tube OD (center-line radius). For 6mm OD tube: minimum bend radius ≈ 48mm. For 8mm OD tube: minimum bend radius ≈ 64mm. Bending below the minimum radius kinks the tube, restricting airflow and creating a stress point that will crack over time. Use elbow fittings (PV or PL) for bends tighter than the minimum radius.

Can I use these fittings for water circuits?

Yes, for clean water and light non-corrosive fluids at pressures up to 1.0 MPa and temperatures up to 60°C. Not suitable for hot water above 60°C, hydraulic oil, or aggressive chemicals. For drinking water applications, verify the fitting material is food-grade certified — standard POM/PA fittings may not meet food-grade requirements.

How do I release a tube from a push-in fitting?

Press the release collar (blue or grey ring around the tube entry) firmly inward toward the fitting body while simultaneously pulling the tube straight out. Do not pull at an angle — pull along the tube axis only. On elbow fittings, pull the tube along its own axis, not toward the other port. If the tube does not release, ensure the release collar is fully depressed before pulling.