KOMATSU O-RING KIT (Civil Equipment Metric)

• SKFM Material exceeds OEM standard
• Suitable for civil and construction equipment
• 508pc kit

Sizes and Dimensions

5.3×2.4 – 15 pcs
• ID 5.3 × CS 2.4 × OD 10.1 mm

P5 – 15 pcs
• ID 5.1 × CS 1.9 × OD 8.9 mm

P6 – 15 pcs
• ID 6.1 × CS 1.9 × OD 9.9 mm

P7 – 15 pcs
• ID 7.1 × CS 1.9 × OD 10.9 mm

P8 – 15 pcs
• ID 8.1 × CS 1.9 × OD 11.9 mm

P9 – 15 pcs
• ID 9.1 × CS 1.9 × OD 12.9 mm

P10 – 15 pcs
• ID 10.1 × CS 1.9 × OD 13.9 mm

AS011 – 25 pcs
• ID 11.2 × CS 1.8 × OD 14.8 mm

AS012 – 12 pcs
• ID 12.5 × CS 1.8 × OD 16.1 mm

9.5×1.5 – 12 pcs
• ID 9.5 × CS 1.5 × OD 12.5 mm

12×1.5 – 6 pcs
• ID 12.0 × CS 1.5 × OD 15.0 mm

15.5×1.5 – 12 pcs
• ID 15.5 × CS 1.5 × OD 18.5 mm

8.5×1.5 – 6 pcs
• ID 8.5 × CS 1.5 × OD 11.5 mm

AS013 – 12 pcs
• ID 13.8 × CS 1.8 × OD 17.4 mm

AS014 – 12 pcs
• ID 15.1 × CS 1.8 × OD 18.7 mm

17.8×1.9 – 15 pcs
• ID 17.8 × CS 1.9 × OD 21.6 mm

AS015 – 12 pcs
• ID 16.4 × CS 1.8 × OD 20.0 mm

P11 – 25 pcs
• ID 11.1 × CS 1.9 × OD 14.9 mm

12.9×2.3 – 15 pcs
• ID 12.9 × CS 2.3 × OD 17.5 mm

12.3×1.9 – 15 pcs
• ID 12.3 × CS 1.9 × OD 16.1 mm

P15 – 15 pcs
• ID 15.1 × CS 1.9 × OD 18.9 mm

P18 – 15 pcs
• ID 18.1 × CS 1.9 × OD 21.9 mm

P20 – 15 pcs
• ID 20.1 × CS 1.9 × OD 23.9 mm

P22 – 15 pcs
• ID 22.1 × CS 1.9 × OD 25.9 mm

18.8×1.9 – 15 pcs
• ID 18.8 × CS 1.9 × OD 22.6 mm

27.6×2.4 – 12 pcs
• ID 27.6 × CS 2.4 × OD 32.4 mm

AS117 – 10 pcs
• ID 17.0 × CS 2.4 × OD 21.8 mm

16.7×3.4 – 9 pcs
• ID 16.7 × CS 3.4 × OD 23.5 mm

20.7×3.4 – 15 pcs
• ID 20.7 × CS 3.4 × OD 27.5 mm

P25 – 9 pcs
• ID 25.1 × CS 1.9 × OD 28.9 mm

P30 – 9 pcs
• ID 30.1 × CS 1.9 × OD 33.9 mm

P32 – 9 pcs
• ID 32.1 × CS 1.9 × OD 35.9 mm

32.7×3.4 – 9 pcs
• ID 32.7 × CS 3.4 × OD 39.5 mm

43.5×2 – 8 pcs
• ID 43.5 × CS 2.0 × OD 47.5 mm

P4B – 6 pcs
• ID 4.4 × CS 3.1 × OD 10.6 mm

P39 – 8 pcs
• ID 39.1 × CS 1.9 × OD 42.9 mm

P40 – 9 pcs
• ID 40.1 × CS 1.9 × OD 43.9 mm

P45 – 6 pcs
• ID 45.1 × CS 1.9 × OD 48.9 mm

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.