What Is This Product?
Our push-in lubrication fitting is a quick-connect solution for oil and grease systems. No tools needed—just push the tube in and it locks automatically. To disconnect, press the release ring and pull the tube out.
Made from nickel-plated brass, these fittings handle high pressure up to 80 bar (select models up to 150 bar). They are widely used in factory automation, automotive assembly, agricultural machinery, and heavy equipment lubrication systems.
Unlike traditional grease zerks that must be replaced after each use, our fittings are reusable for hundreds of cycles. This reduces maintenance downtime and lowers long-term operating costs.
Why engineers choose this: Fast installation, leak-proof seal, reusable design, and broad compatibility with standard plastic tubes.
Technical Specifications
| Parameter | Specification | Benefit |
|---|---|---|
| Material | Nickel-plated brass | Corrosion and rust resistant |
| Max Pressure | 80 bar (150 bar on request) | Compatible with high-pressure grease systems |
| Temperature Range | -20°C to +70°C | Reliable in cold and hot environments |
| Metric Threads | M3×0.5, M6×1, M8×1, M10×1 | Direct fit for European and Asian equipment |
| BSP Threads | 1/8″ BSP, 1/4″ BSP | Standard British pipe connections |
| UNF Threads | 1/4″ UNF | Compatible with North American machinery |
| Tube Sizes | 3mm, 4mm, 6mm, 8mm, 12mm | Covers low-flow to high-volume systems |
| Tube Materials | PA 6-6, PA 12, nylon, polyurethane | Works with standard industrial plastic tubing |
| Seal | NBR (nitrile rubber) | Excellent resistance to oil and grease |
| Tube Tolerance | ±0.05mm (4–6mm tubes) | Precision fit prevents leaks |
Available Types & Configurations
Straight Fittings
- Direct tube-to-port connection
- Most common type for simple layouts
- Available in all thread and tube sizes
90° Elbow Fittings
- Right-angle connection for space-constrained installations
- Fixed and swivel versions available
- Ideal for tight machinery compartments
T-Piece Connectors
- Splits one line into two directions
- In-line design for easy system expansion
- Suitable for multi-point lubrication circuits
Male Stud Connectors
- Direct equipment connection without extra adapters
- Common in automotive and mobile hydraulic applications
- Reduces potential leak points
Installation Guide
Step 1: Prepare the Tube
- Cut plastic tube at a 90° angle
- Deburr the end to remove rough edges
- Ensure the tube end is clean and dry
Step 2: Connect
- Push tube firmly into the fitting until it bottoms out
- Listen for a slight click (locking mechanism engagement)
- The tube is now locked and pressure-ready
Step 3: Test
- Gently pull the tube to confirm retention
- If properly seated, the tube will not move
- System is ready for immediate pressurization
Disconnecting
- Press the release ring down evenly
- Pull tube out while holding the ring
- Fitting is immediately ready for reuse
Where People Use These
Factory Machines
- CNC machining centers requiring continuous lubrication
- Conveyor systems with multiple grease points
- Quick maintenance without production stops
Automotive Manufacturing
- Robot arm joints on assembly lines
- Paint shop equipment connections
- Rapid reconfiguration during model changeovers
Agricultural Equipment
- Tractors, harvesters, and sprayers
- Performs reliably in dusty, dirty field conditions
- Field maintenance without specialized tools
Construction & Mining Machinery
- Excavators, bulldozers, and loaders
- Heavy-duty vibration environments
Wind Turbines
- High-altitude lubrication points
- Weather-resistant nickel plating
- Reduced maintenance climbing frequency
Why These Are Better Than Old Fittings
| Feature | Push-In Fitting | Grease Zerk | Threaded Connector |
|---|---|---|---|
| Install Time | 10 seconds | 5–10 minutes | 8–15 minutes |
| Tools Needed | None | Wrench + grease gun | Multiple wrenches |
| Reusability | 100+ cycles | Single-use | Limited |
| Leak Risk | Very low | Common after reuse | Moderate |
| Long-Term Cost | Low | High (frequent replacement) | Medium |
Tube Compatibility Guide
Recommended Tube Materials
- PA 6-6 (Polyamide): High rigidity, most common industrial choice
- PA 12: Superior flexibility and chemical resistance
- Nylon: Cost-effective, widely stocked
- Polyurethane: Excellent tear resistance for moving assemblies
- Polyethylene: Chemical resistant, budget-friendly option
Tube Size Selection
- 3mm: Light oil systems, low-pressure circuits
- 4mm: Most versatile size for general applications
- 6mm: Standard grease system flow rates
- 8mm: Heavy-duty and high-viscosity grease
- 12mm: High-volume central lubrication systems
Important Notes
- Always cut tubes square and clean
- Follow CETOP tube standards for optimal retention
- Maintain tube tolerance within ±0.05mm for 4–6mm sizes
Quality & Warranty
- Pressure tested to 1.5× working pressure before shipment
- Material certificates available on request
- 12-month warranty against manufacturing defects
- Free technical support for sizing and installation
Compliance: Manufactured to ISO and CETOP standards for industrial hydraulic and pneumatic applications.
Order Information
Available from stock for immediate shipping. Custom thread sizes and OEM markings available with extended lead times. Contact us for bulk pricing and distributor inquiries.
Need help selecting the right thread size or tube diameter? Our technical team is ready to assist—<email us or use the form on our contact page.
Frequently Asked Questions
Selection Guide: See our Quick Connect Lubrication Fittings guide for a full comparison of push-in, quick-plug, and high-pressure options.
Will this push-in lubrication fitting work with my grease gun?
Yes. As long as your system operating pressure is below 80 bar, these fittings are fully compatible with both oil and grease applications. For higher pressure systems, contact us for 150-bar rated variants.
What if I cut the tube at an angle or leave burrs?
The fitting requires a clean, square cut to form a proper seal. Re-cut the tube at 90° and remove all burrs with a sharp blade or tube cutter. A damaged tube end is the most common cause of leakage.
How tight should the threaded connection be?
Hand-tighten first, then add 1 to 2 turns with a wrench. Do not over-tighten—excessive torque can crack the brass body or distort the NBR seal. Use PTFE tape or thread sealant on BSP threads for best results.
Can I use these fittings outdoors or in wet environments?
Yes. The nickel-plated surface provides excellent corrosion resistance. The operating temperature range of -20°C to +70°C covers most outdoor and industrial environments.
How do I know which thread size to order?
Check the port thread on your existing equipment or consult the machine manual. The most commonly ordered sizes are M6×1 and 1/8″ BSP. If you are unsure, send us a photo of the existing fitting and we will identify it.
What should I do if the fitting starts leaking?
First, verify that the tube is fully inserted and was cut square. If the tube is damaged, cut a fresh section and reconnect. The brass fitting body itself rarely fails; leaks are almost always caused by tube preparation or under-insertion.
Is there a minimum bend radius for the tubing?
Yes. Avoid sharp kinks near the fitting. A gentle bend radius of at least 5× the tube outer diameter is recommended. Sharp bends can restrict flow and make future disconnection difficult.
Are these fittings reusable after years of service?
Absolutely. The internal stainless-steel gripper ring and NBR seal are designed for hundreds of connect/disconnect cycles. If the seal eventually wears, the fitting can often be rebuilt with a replacement seal kit rather than discarded.
Related lubrication resources
Lubrication accessories · Grease line fittings · Grease line tubing guide
Before you buy: read our grease fitting types guide.
