CUMMINS SPARE PARTS & CUMMINS ENGINE
Cummins Genuine and OEM Parts
Quick Details
The table below covers all Cummins engine models in the WBEngine product range. Always confirm your CPL number before ordering to ensure the correct compression ratio and ring specification.
| Engine Model | Part Number | Piston Type | Bore Diameter | Comp. Ratio | Pin Diameter | Kit Includes |
| KTA19 / KT19 | 3096685 | One-piece steel | 159.0 mm | 14.5:1 | 50.8 mm | Piston + Pin + Retainer + Ring Set |
| KTA38 / KT38 | 3631244 | One-piece steel | 159.0 mm | 14.5:1 | 50.8 mm | Piston + Pin + Retainer + Ring Set |
| KTA50 / KT50 | 3631244 | One-piece steel | 159.0 mm | 14.5:1 | 50.8 mm | Piston + Pin + Retainer + Ring Set |
| QSK60 | 4955360 | Steel crown / Al skirt | 152.4 mm | 16.0:1 | 47.6 mm | Piston + Pin + Retainer + Ring Set |
| QSK50 / QST30 | 4089406 | Gallery-cooled steel | 152.4 mm | 16.5:1 | 47.6 mm | Piston + Pin + Retainer + Ring Set |
| QSK38 / QSK23 | 3803709 | Gallery-cooled steel | 152.4 mm | 15.3:1 | 47.6 mm | Piston + Pin + Retainer + Ring Set |
| ISX15 / QSX15 | 4089406 | Steel articulated | 137.2 mm | 17.3:1 | 44.5 mm | Piston + Pin + Retainer + Ring Set |
| ISX12 | 4955260 | Steel articulated | 137.2 mm | 17.3:1 | 44.5 mm | Piston + Pin + Retainer + Ring Set |
| QSM11 / ISM | 3803709 | Aluminum alloy | 125.0 mm | 16.5:1 | 44.5 mm | Piston + Pin + Retainer + Ring Set |
| ISL9 / QSL9 | 4089200 | Aluminum alloy | 114.0 mm | 17.3:1 | 38.1 mm | Piston + Pin + Retainer + Ring Set |
| ISB6.7 / QSB6.7 | 3943721 | Aluminum alloy | 107.0 mm | 17.3:1 | 34.9 mm | Piston + Pin + Retainer + Ring Set |
| 6BT5.9 | 3802699 | Aluminum alloy | 102.0 mm | 17.5:1 | 34.9 mm | Piston + Pin + Retainer + Ring Set |
| QSB4.5 | 4943449 | Aluminum alloy | 102.0 mm | 17.5:1 | 34.9 mm | Piston + Pin + Retainer + Ring Set |
| 4BT3.9 | 3802047 | Aluminum alloy | 102.0 mm | 17.5:1 | 34.9 mm | Piston + Pin + Ring Set (Overhaul Kit Available) |
| ISF3.8 / ISF2.8 | 5309291 | Aluminum alloy | 94.0 mm | 17.8:1 | 30.0 mm | Piston + Pin + Retainer + Ring Set |
Application Matrix — Industries & Engine Selection
Cummins engines are deployed across a wide range of industries, each placing distinct demands on the piston. The table below maps engine series to application sector, duty condition, and typical equipment type to support correct specification decisions for procurement teams.
| Application Sector | Engine Models | Duty Condition | Typical Equipment |
| Mining & Quarrying | KTA19 / KTA38 / KTA50 / QSK60 / QSK38 | Continuous high-load cycles, extreme ambient temps | Haul trucks, drill rigs, underground loaders |
| Power Generation | QSK60 / QSK50 / KTA50 / QST30 / QSK23 | Prime and standby duty, 24/7 operation | Gensets, data centres, remote stations |
| Marine Propulsion | KTA19 / KTA38 / KTA50 / QSM11 / QSL9 | Saltwater environment, sustained RPM | Ferries, workboats, offshore support vessels |
| Construction | QSB6.7 / ISB6.7 / QSM11 / ISL9 | Intermittent heavy load, mobile application | Excavators, cranes, compactors, pavers |
| Oil & Gas | KTA38 / KTA50 / QSK60 / QSK38 | Zone-rated, high-reliability, hazardous area | Pump drives, compressor sets, well servicing |
| On-Highway / Fleet | ISX15 / ISX12 / QSX15 / ISL9 / ISB6.7 | Long-haul duty cycle, emission-regulated | Heavy trucks, coaches, tractor units |
| Agriculture & Irrigation | 4BT3.9 / QSB4.5 / ISF3.8 / ISF2.8 | Seasonal load, dusty conditions | Tractors, irrigation pumps, harvesters |
Product Desicription
Why Source Cummins Pistons from WB engine?
| ✓ Original-Level Engineering Every piston is manufactured to meet or exceed Cummins original dimensional tolerances. Bore diameter, pin clearance, ring groove depth, and compression height are all verified against original data sheets before shipment. | ✓ Technical Pre-Sales Support Not sure which piston applies to your CPL or engine serial number? Our technical team confirms correct fitment before you order — preventing costly returns and installation delays. |
| ✓ Gallery-Cooled Design for Heavy Series KTA and QSK series pistons feature internal oil gallery cooling — the same thermal management architecture used in OEM production engines — keeping piston crown temperatures within safe limits under sustained full-load operation. | ✓ Complete Piston Kit — One Order Each kit includes the piston, hardened alloy steel pin, pin retainer clips, and a full three-ring set (compression x2 + oil ring). No sourcing multiple SKUs from different suppliers. |
| ✓ ISO 9001 Quality Assurance All pistons sourced from ISO 9001:2015 certified manufacturing facilities. Dimensional inspection reports and material certifications available upon request for fleet operators and procurement departments. | ✓ Global Shipping · 24-Hour Processing Orders dispatched within 24 hours to 200+ countries. Dedicated freight options for urgent overhaul situations. Full tracking provided on every shipment. |
