Best Air compressors Online

How to Choose the Right Air Compressor

Air compressors have been around for well over 100 years and have as many uses as there are tools that use air. One reason for their popularity is because air as a resource is safe, flexible, clean and convenient.  These machines have evolved into highly reliable pieces of equipment that are almost indispensable in most of the applications they serve. Compressors can come in a wide variety of different types and sizes.

Ultimately, as with any tool, air tools and the compressors that drive them, have to save the user time and money on any given project. Most compressed air tools are more powerful and typically lighter than standard electric tools or battery powered cordless tools. They are used by virtually every industrial sector from aircraft to automobiles to dairy farming to textiles.

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BV Bike Pump is a high quality bicycle floor pump with easy-to read large gauge and smart valve head that can fit both Presta and Schrader. This pump is available in 2 colors - Twin Valve Design - Newly designed valve head can easily switch between Presta and Schrader valves and without any air leaks. No more reverse! Inflation Speed - Maximum Pressure 160 psi. The extra long hose with 360 degree pivot will make your pumping easier. Accurate and Extra Large Gauge - The large gauge is easy to read and will help you to set your desired pressure. Stable and Durable: Aluminum barrel with ergonomically designed comfortable handle. 100% Satisfaction Guarantee - Backed by BV 30 days Money Back Guarantee with 1 year free replacement warranty....Read more

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MULTIFUNCTIONALCar Battery Jump Starter, Power Bank, 12V/10A Power Source, LED Flashlights, SOS Lifesaving Light, Warning Light, CompassSPECIAL FEATURESLCD Display & CompassDiffere ? [Newly Designed Jumper Cables] The enhanced safety indicator will notify you of any wrong operation with blinking lights and buzzing to prevent you and your vehicle from injury. No worries about sparks. All-metal and ergonomically constructed clamps require less effort to open, and it's durable enough to use for a long time ? [Tinny But Powerful] This portable jump starter cranks 12V cars, SUV, truck or van up to 30 times after a full charge (in 4 hours). It comes with a nice protection case as well as chargers, you can easily pack them up and place it into your glove box ? [12 Months-Long Standby Time] Equipped with an ON/OFF switch and automatic power off function, it features double energy-saving that enable it to be stored up to 12 months without using. Just be sure the power switch is OFF (Do not forget to turn it ON before use/recharging) ? [Your Mobile Power Station] There are dual smart charging ports and one is 5V/9V quick-charge that can charge your phone, tablet or Kindle at 3.6 times faster speed. It can also power your 12V air compressor with an included cigarette lighter adapter ? [User-Friendly Extras] The super bright LEDs make it an emergency flashlight when need and the red warning light can remind the passing cars if there is an accident. And it's a multifunctional life-saver with strobe, SOS signal lights, and a built-in compass. Also, the digital LCD screen shows electricity clearer...Read more

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'Super Fit Clever Valve' Automatically Fits Presta and Schrader Valves, No Valve Change Needed 'Super Fit Clever Valve' attaches to both Presta and Schrader with a tight seal that No Valve Changing Needed: automatically compatible with both Presta and Schrader 120 PSI Extendable Telescope: easily switches from high volume to high pressure Super Fit Clever Valve: no leaks, firmly grips both Schrader and Presta valves automatically Mounting Bracket: attaches the tire pump to your bike, added velcro strap holds the pump firmly in place Included: glueless puncture kit, be prepared for a flat tire anywhere...Read more

While there are many types of compressors, they all perform the same function, which is to increase the pressure and reduce the volume of a given gas such as air. The most common type of compressors work by filling a chamber with air and then reducing the chamber’s volume. These are called positive displacement compressors. They are the most widely available compressors and include reciprocating, rotary screw and rotary vane compressors.

Of all the positive displacement compressors, Reciprocating or Piston compressors are the most commonly available on the market and can be found in ranges from fractional to very high horsepower. These compressors are sold world wide by many mass marketers and a large variety of retail outlets.

Rotary compressors (Screw and Vane) and the centrifugal compressors are also commonly found but in more of an industrial/commercial environment. Normally they are operated at significantly higher horsepower and flow rates, which makes them more expensive buy and to operate. 

The following paragraphs contain some very general information on piston compressors that will allow for a more informed decision concerning the type and size of compressor being considered.

Single Stage and Two Stage Reciprocating Pumps

Reciprocating (Piston) Compressors can be widely found in two primary configurations; Single Stage and Two Stage.

Single stage air compressors work by drawing air in and subsequently compressing the air to its final pressure in single piston stroke. Single stage air compressors can attain pressures of up to 150 PSI. Typically, a single stage pump will have a higher CFM(Cubic Feet per Minute) rating than a two stage pump because every cylinder is drawing in air and compressing it with air during every rotation.

Two stage air compressors work in a very similar manner with the primary difference being that they compress the air in 2 steps or stages. During the first step or stage, air is drawn in and compressed to an intermediate pressure. After being compressed in the first stage, the air is piped, usually through an intercooler where the air is allowed to cool, to be compressed in the final or second stage. Two stage compressors are normally good for pressures up to 200psi. Two stage pumps are more efficient at higher pressures because the air is cooled between the stages.


            Displaced CFM (DCFM) is a mathematical formula that calculates the bore, stroke and rpm into a CFM figure(Bore x stroke x rpm/2200=DCFM). This figure will always be the highest CFM because this formula does not take into account variables like temperature, atmospheric pressure, humidity, friction and heat dissipation.

Another CFM term often used is Standard CFM (SCFM).  It defined as the measured flow of free air and converted to a standard set of reference conditions (14.5 PSIA, 68 Degrees F, and 0% relative humidity).

Yet another CFM term is Actual CFM (ACFM). AFCM can be determined in a number of different ways. The most common methods include measuring the volume of air that is moved through an orphic plate or measuring pump up times on large compressor tanks and running through a simple calculation. This CFM number takes in effect all the variables and will give the true output of the pump at the current working conditions (i.e. temperature, altitude, humidity, …).

Often times, CFM numbers are also shown at various pressures.  These numbers can be very useful to help determine if a compressor produces enough CFM for the desired application, but can be confusing when comparing differing pressures or volumes or different compressors.

The best way of comparing compressors is through SCFM. Since all the measurements are calculated back to a set of reference standard conditions, it levels the playing field among the multitude of different manufacturers.

Electric Motors and Horsepower

         Compressors are often rated by Horsepower(HP). As simple as this sounds, there are different variations of HP.  Some compressor manufacturers rate their air compressors by peak horsepower, also known as brake horsepower. Peak horsepower is the maximum output that a motor can produce while the motor has the start windings engaged. Peak HP can be as much as 5-7 times the rated or running HP. Under normal operating conditions, the start windings are only engaged for a small fraction of a second. Therefore, using peak horsepower as a comparison tool can be somewhat misleading since under normal operating conditions the motor only develops this horsepower during startup.  If the motor drive system causes the start winding to remain engaged for a long period of time, the motor will either overheat if it has thermal protection or fail prematurely.

Most electric motor manufacturers rate their motors by the horsepower developed after the motor has come up to its designed operating rpm’s and disengaged the start windings. This is often referred to as running or rated horsepower and is a true indication of the HP a motor can sustain over a long period of time.

Some other factors to consider when looking at motors is Duty Cycle and Service Factor.  Duty cycle is normally rated as either intermittent or continuous and is defined as the time rating under full load.   In other words can the motor run at full load horsepower continuously or only intermittently. The other of the two noteworthy factors is the Service Factor (S.F.) rating of the motor. It is defined as the percentage of rated horsepower at which the motor can safely operate (i.e. 1.15 SF = 115% of rated HP).  Higher service factors allow motors to handle more varied conditions without causing motor overheating or premature motor failure.  Examples that could cause a motor to run within its Service Factor could be caused by low voltage, higher ambient temperatures, higher startup load …etc.

Note: Many companies are now eliminating the peak HP reference and instead using SCFM as a more accurate performance indicator.

Air Compressor Buying Guidelines

            Before choosing any compressor to purchase, understanding the compressor’s uses will ensure that the machine can do the required job. Buying a compressor that is too small will waste valuable time. Buying a compressor that is way too large will waste valuable resources. (See the CFM Usage Chart)

It is worth noting that the price of a compressor cannot be based solely on the up front purchase price of the unit. The price of any item should be based on the overall cost over an extended period of time or the life of the unit. Inexpensive units are designed to be disposable, like lighters.

The questions that need to be answered are:

1.)   What is the maximum required operating pressure?

This will determine if a Single Stage or Two Stage compressor will be needed

2.)   What is the maximum required CFM usage?

      Add up all of the air tools that are to be used at the same time.  When looking at the compressor, add approximately 30% to the determined CFM number. This will allow for a reasonable buffer against unknown or uncommon compressor usage.

Do not simply add up all of the air tools that will be used throughout the work day since this will produce an inflated CFM number and require the purchase of an overly large compressor.

3.)   Does the machine need to be portable or stationary?

Determine whether or not the unit will need to be moved around your facility or work site regularly or if it will be a stationary unit. This will aid in determining other factors such as size and weight. Higher pressures and volumes will require the unit to be larger in size and heavier in weight since horsepower requirements, pumping systems, chassis construction, electrical components, etc... will have to be larger to accommodate these increases.

4.)   What type of drive system is needed? Electric Motor or Gasoline Engine?

Knowing the environment that the compressor is to be used in will determine what type of drive system the machine will need.  If there is always electrical power available, then the drive system should be an electric motor since they are significantly less expensive to buy and run and require less overall maintenance. If electrical power is not always available then the convenience of a gasoline engine driven compressor will be the way to go.  They offer the best in portability and work area flexibility.

5.)   What receiver tank size will be needed?

The size of the compressor tank, usually measured in gallons, should be determined by the overall type of usage.  If the usage is in short quick concentrated bursts, such as an air nailer, then a small tank size can be used. If the unit is to sustain long periods of usage, such as a board sander or impact wrench, a larger tank size will be necessary.

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This SMC KQG2E07-00 bulkhead union tube fitting joins 1/4" OD tubing through a bulkhead. Two 1/2"-20 Unified National Fine (UNF) thread lock nuts hold the fitting securely to the b Joins 1/4" OD nylon, polyurethane, or polyolefin tubing through a bulkhead Push-to-connect mechanism provides reliable retaining force on tube 316 stainless steel for corrosion resistance in a wash down environment For use with vacuum up to -100 kPa and pressure up to 145 psi Operating temperature range of -5 to +150 degrees C This product is not intended for use in potable water systems...Read more

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Four Seasons 55119 Discharge Line Hose Assembly Four Seasons 55119 Discharge Line Hose Assembly (55119)...Read more

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This heavy-duty NorthStar compressor is built with a durable cast iron V-twin pump with cast iron heads for good heat dissipation and no transfer of heat between cylinders. Belt dr 2 HP 115V/230V 15/7.5 Amp dual voltage induction motor 2-cylinder cast iron single-stage pump Delivers 5.0 CFM @ 90 PSI; 6.0 CFM @ 40 PSI Copper finned inter- and after-coolers provide effective heat dissipation and less moisture Ball bearings on each side of crankshaft for smooth running and durability...Read more

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Features: 1.This fog reduced professional spray gun is characterized by a high transfer rate, low overspray, low air consumption and good atomization. Through the HVLP technology ( HLVP (high-volume, low-pressure) technology provides a higher transfer of materials while reducing bounceback and overspray Nozzle Size: 1.7mm; Plastic Color Cup Size: 600cc; Working pressure 10 PSI Built-in 3 control knobs: Fluid control regulates amount of paint sprayed, Pattern control adjusts the fan pattern size, and air adjustment valve provides versatility to adjust air flow Lightweight, ergonomic design and easy trigger pivot reduce operating fatigue. Gravity feed design minimizes material waste Multi-purpose spray gun suitable to spray cars, machines, furniture, instruments, drawings, toys, crafts and small spots;High speed spraying, perfect pulverization...Read more

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ASTEUROHV105 Features: -Durable and lightweight. -High efficiency. -Quick thread technology. -Smooth operation. Dimensions: Overall Height - Top to Bottom: -5 Inches. Overall Width A massive 86% transfer efficiency rate Cup capacity: 600ml Operation Pressure: 29psi Avg. Air Consumption: 9-10cfm Max. Pattern at 4"-7": 9"-10.25"...Read more