O-Ring P Type Size List

O-Rings are essential sealing components used in a wide range of static and dynamic applications. The P Series (based on the JIS B 2401 standard) is widely used in Japanese and Asian manufacturing systems. This article provides a detailed overview of the P-series O-Ring dimensions, including standard inner diameter (ID) and cross section (CS), to help engineers and procurement specialists quickly identify suitable sizes.

🔧 What Is the JIS P Series O-Ring?

  • Defined by JIS B 2401 standard

  • "P" stands for dynamic or general-purpose applications

  • Dimensions are in metric units (mm)

  • Commonly used in hydraulic cylinders, compressors, and machine seals

  • Ideal for sliding, rotating, or press-fit sealing

🧰 Common Applications

  • Hydraulic & pneumatic cylinders

  • Automotive engine seals

  • Precision machinery

  • Sliding shafts and pistons

  • General industrial sealing

📐 How to Select the Right P O-Ring?

  1. Confirm installation groove size (shaft/bore)

  2. Choose proper cross section (CS) based on pressure

  3. Match working conditions with the right rubber material (NBR, FKM, EPDM, etc.)

  4. Refer to JIS B 2401 or OEM specs

🏭 CNL O-Ring Advantages

  • Full stock of JIS P-series O-Rings

  • Rubber materials: NBR, FKM (Viton), EPDM, Silicone, HNBR

  • Support for custom molds and bulk orders

  • Available with ISO, RoHS, REACH certifications

  • Tight tolerance control with Class A / B options