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Single Stage Air Compressor Pumps
CompressorPros carries single stage air compressor pumps for shops replacing a worn pump. This category serves contractors, small shop owners, and maintenance techs matching a pump to their motor's horsepower and their air demand. Browse single stage options across a range of HP and CFM, all shipping free, direct from the manufacturer.
What Are Single Stage Air Compressor Pumps?
A single stage air compressor pump compresses air to its final pressure in one piston stroke, drawing in ambient air and delivering it straight to the tank. That simpler design makes it more economical than a two stage pump and well-suited to shops running intermittent tools at moderate pressure, typically topping out around 125 to 135 psi. Contractors, small shops, and maintenance techs turn to these when repairing a compressor rather than replacing it, and the category includes widely used options like the Jenny 1 to 2 HP Single Stage Model KU.
Matching Horsepower and CFM
The most practical way to narrow this category is by the horsepower your existing motor delivers and the airflow your tools require. Single stage pumps commonly span 1/3 HP through 5 HP, with CFM output rising alongside horsepower.
At the light end, a pump like the Jenny 1/3 to 1 HP Single Stage Model F suits small units running an occasional nailer or blow gun. The 1 to 2 HP range, covered by pumps such as the PAT24, fits general shop work with a single tool. Moving to 3 to 5 HP, the Jenny 3 to 5 HP Single Stage Model GU supports higher airflow demand while staying within single stage pressure limits.
The pump has to be rated for the motor you already own. Pairing a higher-output pump with an undersized motor causes overload and early failure, so confirm HP compatibility before ordering.
Pump and Service Kit Bundles
Some single stage pumps ship as kits including the oil and filter needed to commission the pump, which puts the consumables in the same order as the swap. The Schulz MSL 18 MAX KIT 4 to 5 HP is an example of this approach.
Direct Replacement Pumps
Where a pump is sold as a direct replacement for a specific machine, fit is largely settled by the part number. The Mi-T-M Single Stage Replacement Pump 3-0303 is built to drop into its matching unit, which simplifies sourcing when you know your model.
Brand Lines
Jenny Single Stage Pumps
Jenny offers one of the broadest single stage ranges here, spanning 1/3 HP through 5 HP across the F, K, KU, G, GU, and JU models. That spread makes it straightforward to match an existing motor without moving up a stage. Browse the full Jenny pump line to find a model.
C-Aire Single Stage Pumps
The C-Aire Chinook series covers common shop horsepower ranges.
Schulz Single Stage Pumps
The Schulz MSL MAX series brings cast iron construction to the single stage range at 2 HP and 4 to 5 HP, with several models available as kits. Browse Schulz pumps for options.
Key Specifications To Match
- Horsepower (HP): Must align with your existing motor. This is the first filter for any replacement pump.
- CFM output: Determines whether the pump meets the air demand of the tools it supplies.
- Maximum pressure (PSI): Single stage pumps generally reach around 125 to 135 psi. If you need more, a two stage pump is the right category.
- Mounting pattern and pulley: Physical fit to your frame and belt drive. A mismatch here is the most common fitment problem.
- Construction material: Cast iron favors heat tolerance and longer service life under regular use, while lighter designs suit intermittent duty.
- Included kit contents: Some pumps ship with a filter, others do not. Check before ordering.
Because a replacement pump has to work with the motor, frame, and drive you already own, confirm these specs against your unit's manual before purchasing.
Frequently Asked Questions
What is the difference between a single stage and two stage air compressor pump?
A single stage pump compresses air to final pressure in one stroke and typically reaches 125 to 135 psi, while a two stage pump uses two or more cylinders and an intercooler to reach roughly 175 psi. Single stage designs are more economical and well-suited to intermittent, moderate-pressure work.
Is a single stage pump enough for my shop?
If you run one or two tools intermittently and your working pressure stays under about 125 psi, a single stage pump is usually sufficient.
How do I know which single stage pump fits my compressor?
Match the pump's HP range, CFM, and mounting pattern to your existing motor and frame, using the specs on your current pump or the machine's manual. Sourcing by brand and model is the simplest way to confirm the connection points line up.
What is the most common mistake when buying a replacement pump?
Focusing on horsepower alone and overlooking the mounting pattern, pulley, and CFM. A pump can match your motor's HP and still fail to bolt to the frame or meet your air demand, so verify all four.
How long does a single stage pump last?
Service life depends heavily on duty cycle and maintenance rather than the pump alone. Regular oil changes and a clean intake filter are the largest factors in getting full life from any reciprocating pump.
Shop Single Stage Air Compressor Pumps at CompressorPros
CompressorPros carries single stage air compressor pumps from a fraction of a horsepower through 5 HP, alongside two stage pumps and the wider replacement pump category. Matching HP, CFM, and mounting keeps the swap straightforward, and pairing a new pump with fresh filters, oil, and maintenance items gets it off to a clean start. All orders ship free, direct from the manufacturer, and our team can help you confirm the right pump.