ST Copper Check Valve Oil Fitting R1/8 to M8x1 | Lubrication

ST Type Straight-Through Check Valve Oil Lubrication Fitting

Keep your lubrication systems running smoothly with this precision-engineered ST Type Straight-Through Check Valve Oil Fitting. Crafted from high-quality copper, this proportional dispenser fitting is designed to regulate and maintain consistent oil flow in lubrication lines — making it an essential component for industrial machinery, pneumatic systems, and mechanical equipment maintenance.

With male thread connections ranging from R1/8 to M8x1, this versatile bushing-type fitting integrates seamlessly into a wide range of tubing gauge setups. Its equal-shape, straight-through design ensures minimal flow resistance while the built-in check valve prevents backflow, protecting your system integrity.

Made in Mainland China.

Key Features

• Material: Durable copper construction for excellent corrosion resistance and longevity
• Type: Straight-through (ST) bushing with integrated check valve function
• Thread Size: R1/8 to M8x1 male connection
• Max Pressure: <850 kPa — suitable for low-to-medium pressure lubrication systems
• Shape: Equal / straight-through for unrestricted, proportional flow
• Connection Type: Male thread for secure, leak-resistant installation
• Application: Oil lubrication dispensing, tubing gauge lines, and centralized lubrication systems

Why Choose This Fitting?

• ✅ Proportional flow control keeps oil distribution consistent and precise
• ✅ Check valve function prevents reverse flow and protects downstream components
• ✅ Compact copper body withstands industrial operating conditions
• ✅ Easy thread-in installation — no special tools required
• ✅ Compatible with a variety of standard lubrication and pneumatic tubing setups

Specifications

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Frequently Asked Questions

Q: What is the ST type straight-through check valve fitting used for?

A: This ST type fitting is used in centralized oil lubrication systems to regulate proportional oil flow through tubing lines. The integrated check valve prevents oil from flowing backward, protecting pumps and downstream components in industrial or mechanical applications.

Q: What thread sizes does this copper oil fitting support?

A: This fitting covers a range from R1/8 to M8x1 male thread sizes, making it compatible with many standard lubrication and pneumatic tubing gauge configurations used in machinery maintenance.

Q: What is the maximum pressure this fitting can handle?

A: This ST type check valve fitting is rated for pressures below 850 kPa, making it well-suited for low-to-medium pressure oil lubrication dispensing systems.

Q: Is this fitting easy to install?

A: Yes. The male thread connection design allows for straightforward thread-in installation using standard tools, and the equal straight-through shape ensures minimal flow restriction once fitted.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.