The ATC-7020 (also known as PT-7020) is a precision, heavy-duty piston ring compressor designed for Cummins NH, NT, and N14 diesel engine platforms. It fits an exact 5.50-inch (139.7 mm) bore, making it the ideal tool for compressing piston rings without damaging them or the pistons during installation.
Manufactured in the USA, this compressor replaces the legacy PT-7020 model and offers a rugged design built to endure the high demands of engine rebuild shops and heavy duty service environments.
The ATC-7020 ensures a tight, uniform compression of the rings around the piston, reducing the risk of ring breakage, distortion, or bore scoring when inserting the piston into the cylinder. With its durable construction and exact bore match, it helps technicians maintain efficiency, precision, and reliability.
Key Features & Benefits
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Designed for 5.50″ (5.5 in) bore size in Cummins NH / NT / N14 engines
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Direct replacement for PT-7020 — same fit and function but made in USA
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Machined to high tolerances to ensure concentric ring compression
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Eliminates dependency on spring style ring compressors
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Helps prevent ring damage, scuffing, or misalignment during install
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Built for shop and field durability
Typical Applications
Use the ATC-7020 whenever installing piston rings in Cummins engines in the NH / NT / N14 family. It’s especially useful during overhauls, rebuilds, or when precision and repeatability are required.