HITACHI O-RING KIT ( Civil Equipment)

• SKFM Material exceeds OEM standard
• Suitable for construction and civil equipment
• 530pcs

Part number and QTY

• P3 — 15 pcs

• P5 — 15 pcs

• P6 — 15 pcs

• P7 — 15 pcs

• P8 — 15 pcs

• P9 — 15 pcs

• P10 — 15 pcs

• AS013 — 9 pcs

• P12 — 15 pcs

• P12.5 — 15 pcs

• AS014 — 8 pcs

• P15 — 15 pcs

• P16 — 15 pcs

• P18 — 15 pcs

• P20 — 15 pcs

• P21 — 15 pcs

• AS015 — 12 pcs

• P22A — 9 pcs

• AS210 — 15 pcs

• P24 — 8 pcs

• P25 — 9 pcs

• AS214 — 15 pcs

• P26 — 9 pcs

• P29 — 9 pcs

• P11 — 25 pcs

• P14 — 25 pcs

• AS018 — 25 pcs

• AS021 — 25 pcs

• AS025 — 12 pcs

• AS219 — 15 pcs

• P32 — 9 pcs

• P22 — 15 pcs

• A912 — 15 pcs

• P35 — 9 pcs

• G40 — 9 pcs

• P30 — 8 pcs

• G50 — 2 pcs

• G45 — 6 pcs

• P38 — 15 pcs

• G40 — 2 pcs

• G60 — 2 pcs

Uses of SFKM O-Rings in Earthmoving Equipment

SFKM O-rings are high-performance fluoroelastomer seals designed for extreme temperature, chemical exposure, and demanding fluid environments found across heavy-diesel and earthmoving machinery. This material provides superior resistance to aggressive oils, fuels, and hydraulic fluids, making it suitable for the harshest operating conditions.

Where SFKM O-Rings Are Commonly Used

• High-temperature engine components, including fuel systems, turbocharger areas, and hot oil circuits.

• Hydraulic systems using advanced or synthetic hydraulic fluids that would degrade nitrile or standard elastomers.

• Fuel injection systems exposed to modern diesel blends, bio-diesel, and high-temperature fuel return lines.

• Sealing locations with chemical exposure, including coolants, oils, and additives.

• Static and dynamic seals where long-term compression resistance and chemical stability are critical.

Why SFKM Is Selected

• Exceptional chemical resistance to petroleum oils, synthetic lubricants, diesel fuel, biodiesel, gear oils, and many aggressive additives.

• Very high temperature tolerance, typically from –20 °C up to +200–230 °C depending on grade.

• Excellent compression-set resistance, ensuring the seal maintains its shape under long-term heat and pressure.

• Superior resistance to hardening and degradation, even with constant exposure to hot oils and fuels.

• Outstanding durability in harsh, contaminated environments, common in earthmoving and heavy-diesel equipment.

Limitations and When Not to Use SFKM

• Not suited for very low-temperature applications (below –20 °C, depending on grade), where elasticity may decrease.

• Not compatible with certain amine-based fluids such as some refrigerants or special brake fluids.

• Higher material cost than nitrile or silicone, making it best reserved for applications that require its performance advantages.

Practical Examples in Earthmoving Equipment

• High-temperature hydraulic pump seals using advanced or high-performance hydraulic oils.

• Fuel system seals including high-pressure diesel injection, injector return lines, and fuel pump housings.

• Engine and transmission oil seals located in areas with sustained high heat.

• Turbocharger and exhaust-proximate sealing points where both heat and chemical exposure are severe.

Material-Selection Guidance

• Choose SFKM O-rings when the application involves high temperature, aggressive oils or fuels, or long-term chemical exposure.

• For moderate temperatures and standard oils, nitrile or HNBR may be more economical.

• Always verify fluid compatibility and operating conditions to ensure the correct elastomer is selected.