Komatsu Heavy Equipment Piston 6204-31-2121

Komatsu Heavy Equipment Piston 6204-31-2121 is part of the 19PARTS KOM line, developed for demanding heavy-equipment service where dependable fit, durability, and day-to-day uptime matter. This piston is manufactured in Italy in an ISO-certified facility with more than 50 years of production experience and is backed by our Keep Ops Moving™ commitment.

Why buyers choose the 19PARTS KOM line

• Manufactured in Italy for heavy-equipment applications
• Produced in an ISO-certified facility with more than 50 years of manufacturing experience
• Built for dependable performance in Komatsu assemblies
• Supported by 19PARTS and our Keep Ops Moving™ commitment

Fitment hint from source data

Source usage data links this part to Excavator, Wheel Loader, Dozer applications. Common machine models include: D31P, D31PL, D31PLL, WA100, WA100SS, WA100SSS, WA120, PC100, PC100L, PC100S, PC100SS, PC100U, PC100US, PC120. Reported category/application areas: BULLDOZERS, WHEEL LOADERS, EXCAVATORS. Reported serial ranges include: 40001-UP, 40001-UP (INCL. DDK031-4K), 10001-UP (OVERSEAS VERSION), 10001-UP, 18001-UP (TBG. SPEC. (GERMANY)), 18001-UP, 12001-UP, 18001-UP (FOR U.S.A.). Related or analog part numbers from source data: 6204312111.

Part information

• Komatsu part number: 6204-31-2121
• Alternate search number: 6204312121
• Product type: Piston
• Usage-report description: PISTON (S), PISTON

Fitment and verification

Use the model-specific hubs and diagram callouts on our site to verify the correct Komatsu part number, callout location, and serial-range fitment before ordering. The hubs provide the machine-specific authority, while this product page focuses on quality, sourcing, and buying confidence.

Brand and quality

The 19PARTS KOM line is built around practical uptime: quality-focused Komatsu replacement parts, transparent identification, and support for customers who need to keep machines working. For part number 6204-31-2121, rely on 19PARTS to help you Keep Ops Moving™.