Metric Buna O Rings: How to Measure & Choose the Best Fit in 2025?

metric buna o rings

ഉള്ളടക്ക പട്ടിക

Struggling with seal fit and leaks in hydraulic or pneumatic systems? Metric Buna O Rings may be the exact solution you need—let me explain why.
Metric Buna O Rings offer precise fit and excellent oil resistance, ideal for modern industrial sealing. Here's how to measure, select, and source the right one.

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This guide helps you select the best metric Buna O ring based on your system specs—covering sizes, materials, pressure, and oil compatibility.

What are metric Buna O rings used for?

Metric Buna O Rings are essential for sealing in metric-based systems.
They're used in hydraulic cylinders, pneumatic valves, fuel systems, and industrial machinery.

Metric Buna O Rings are made from NBR (nitrile rubber), offering excellent resistance to oils, fuels, and abrasion. Commonly found in European and Asian equipment, they are ideal where inch-sized O rings don’t fit. They're widely used in:

  • Hydraulic cylinders to prevent leakage
  • Pneumatic systems to maintain pressure
  • Automotive fuel systems for reliable sealing

നിങ്ങൾക്ക് ഞങ്ങളുടെയും പര്യവേക്ഷണം ചെയ്യാം complete Buna O Ring guide for a deeper dive into NBR’s advantages.

How do I measure a metric O ring?

Correct measurements ensure leak-proof performance.
You’ll need to measure the ID, CS, and calculate the OD.

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To measure a metric Buna O Ring:

  1. ആന്തരിക വ്യാസം (ID) – Measure across the inside.
  2. ക്രോസ്-സെക്ഷൻ (CS) – Measure the ring’s thickness.
  3. പുറം വ്യാസം (OD) – Use the formula: OD = ID + 2 × CS.
  4. വലുപ്പ ചാർട്ടുകളുമായി താരതമ്യം ചെയ്യുക – Use an AS568 or ISO chart to match.

Common sizes include:

ഐഡി (മില്ലീമീറ്റർ) സിഎസ് (മില്ലീമീറ്റർ) അപേക്ഷ
10.0 2.0 പമ്പുകൾ, വാൽവുകൾ
18.8 1.9 ന്യൂമാറ്റിക് സിലിണ്ടറുകൾ
22.4 3.1 ഓട്ടോമോട്ടീവ് ഘടകങ്ങൾ

Need a broader range? Try our O Ring Assortment Kit for fast inventory management.

Are metric Buna O rings compatible with hydraulic fluid?

Yes—Buna O Rings are ideal for hydraulic oil sealing.
They resist mineral-based oils and seal reliably under pressure.

Metric Buna O Rings offer excellent performance in hydraulic fluid systems:

  • Hydraulic actuators - ചോർച്ച തടയുക
  • High-pressure valves – Maintain system stability
  • Pump seals – Withstand fluid exposure and wear

For more demanding environments (e.g., with high temp or strong chemicals), consider FKM O Rings for heat sealing അല്ലെങ്കിൽ EPDM O Rings for steam & water resistance.

How do I select the right metric Buna O ring?

Selection depends on pressure, fluid, and environmental exposure.
You’ll need to evaluate material, durometer, and system specs.

Here’s a breakdown to guide your choice:

ഘടകം മികച്ച പരിശീലനം
മെറ്റീരിയൽ Ensure NBR fits your chemical exposure
Size Accuracy Use precise calipers for fit
താപനില പരിധി Buna handles -40°C to 120°C comfortably
പ്രഷർ റേറ്റിംഗ് Use 90 Shore hardness for high-pressure applications
Alternative Options ഉപയോഗിക്കുക FKM or EPDM for heat or steam resistance

Need help choosing? Ask our team for guidance on ആപ്പ് or check our NBR O-Ring product line.

Where can I buy metric Buna O rings in bulk?

Buy directly from trusted industrial suppliers like Hengoseal.
We offer global delivery, custom sizing, and low MOQ.

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At Hengoseal, you’ll find:

  • Custom-molded metric Buna O Rings
  • Bulk order discounts for manufacturers
  • Fast global fulfillment

Need sealing for various applications? Our O Ring Assortment Kit is also available for on-the-go repairs.

തീരുമാനം

Metric Buna O Rings ensure precise sealing for hydraulic, pneumatic, and fuel systems—especially where inch-based rings don’t fit.

Browse metric sizes & get expert help today

📩 ഇമെയിൽ: [email protected]
📞 വാട്ട്‌സ്ആപ്പ്: +86 17622979498

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ആളുകൾ ഇതും ചോദിക്കുന്നു

1. Can I use metric Buna O rings in fuel systems?
Yes, they perform well with petroleum-based fuels and oils.
2. What hardness is standard for metric Buna O rings?
Most are 70 Shore A, but 90 Shore is available for high pressure.
3. How long do metric Buna O rings last?
Typically 5–10 years, depending on exposure and storage.
4. Are metric and inch O rings interchangeable?
Not usually. Always compare ID and CS before substituting.
5. What if I need FDA-grade material?
Consider switching to silicone or EPDM for food-grade compliance.
6. Can metric Buna O rings handle steam?
Not ideal—ഇപിഡിഎം is better for steam and high temp moisture.
7. Do you offer custom-molded metric sizes?
Yes, we offer full customization with low minimums.
8. Where can I find size charts for metric O rings?
Refer to our size guide in the O Ring Kit article.
പോസ്റ്റ് പങ്കിടുക:

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ഞങ്ങളുടെ വാർത്താക്കുറിപ്പിൽ ചേരൂ

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