Cummins Parts 55# Pipe

The "Cummins parts 55# Pipe" you mentioned is commonly referred to in the industry as the metal pipe with an outer diameter of approximately 55mm (≈ 2.165") on a Cummins engine. The most common type is the exhaust pipe / exhaust tail pipe, and there are also a few fuel pipes / water pipes. Below is an introduction from the aspects of meaning, type, common part numbers, material and usage, and compatible models:

1. "55# Pipe" means

55#: This is not a material code, but a colloquial abbreviation for a pipe with an outer diameter of 55mm (corresponding to approximately 2.165" in English).

Pipe: In the Cummins system, it mostly refers to hard pipes (Tube/Pipe), which is different from soft pipes (Hose).

Core: The metal pipe with an outer diameter of 55mm for the engine, with exhaust pipes being the most common.

2. Common types and part numbers

1) Exhaust system 55mm pipe (most commonly used)

Usage: Exhaust from the turbine, connection pipe for mufflers, tail pipes, elbows, bellows, etc.

Common part numbers (example):

3020988: KTA19 exhaust bellows (55mm flange)

3026237: NT855/K19 exhaust pipe connector

T550-6: N14/ISX 5.5" turbine exhaust short pipe (outer diameter ≈ 55mm)

Features: 55mm outer diameter, flange / clamp connection, high temperature resistance (500–650℃), rust-proof.

2) Fuel System 55# Pipe (rare, mostly high-pressure fuel pipes)

Part number examples: 5536530, 5536515, 5558764 (fuel supply pipe / injector oil pipe).

Material: Cold-drawn seamless steel pipe (20#/45# steel), galvanized / phosphated treatment, with a pressure resistance of 60–80 MPa.

Usage: High-pressure fuel supply for PT fuel system, connection for injectors.

3) Cooling / Water Pipe (occasionally referred to as 55#)

Part number example: 5578780 (Z14 Water Distribution Pipe).

Material: Cast aluminum / Stainless steel, 55mm flange interface, temperature resistance up to 120℃, pressure resistance 0.8–1.2MPa.

III. Materials and Key Parameters Material:

Exhaust pipe: Aluminized steel / stainless steel (304/316), wall thickness 1.5–2.5mm.

Fuel pipe: 20#/45# seamless steel, wall thickness 2–3mm, high-pressure formed.

Connection methods: Flange (45°/90°), V-type clamp, threaded joint.

Adaptation pressure:

Exhaust: Atmospheric pressure to 0.3MPa (exhaust gas).

Fuel: High pressure 60–80MPa.

IV. Applicable Models (Common)

Heavy-duty diesel engines: NT855, N14, K19, K38, ISX15, ISM11, QSM11, etc.

Application scenarios: Heavy trucks, construction machinery, generator sets, marine power.

V. Purchase Tips

First, confirm the part number (Part No.). 55mm is just the specification; the part number uniquely matches the model.

Distinguish exhaust / fuel / water pipes: Exhaust pipe is resistant to high temperature, fuel pipe is under high pressure, and water pipe is resistant to water corrosion.

Material priority: Original factory aluminized steel / stainless steel > ordinary carbon steel, durability is 3–5 times worse.

In simple terms: 55# Pipe is the 55mm outer diameter metal pipe of Cummins. In 90% of cases, it is an exhaust pipe; a few are fuel / water pipes. Match precisely according to the part number and model.

55# Pipe
The "Cummins parts 55# Pipe" you mentioned is commonly referred to in the industry as the metal pipe with an outer diameter of approximately 55mm (≈ 2.165") on a Cummins engine
Cummins brand

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