5 HP Screw Compressor: Specifications, Applications, and Buying Tips for Small Shops
Jake spent three weeks researching compressors for his new woodworking shop in Portland. He had exactly 240V single-phase power, a 20-by-24-foot floor plan, and a budget of USD 6,000. Every guide he found covered rotary screw compressors broadly, skipping the details that mattered at 5 HP: would his panel handle the startup surge, which models actually ran on single-phase, and could one machine power his spray gun and brad nailer at the same time?
This article answers those questions directly. You will get exact 5 HP screw compressor specifications from six major brands, a clear single-phase vs three-phase decision framework, real electrical requirements, and a tool compatibility table that shows what a 5 HP unit can actually run. Whether you are equipping a home garage, a two-bay auto shop, or a small metal fab, here is everything you need to know before you buy.
What a 5 HP Rotary Screw Compressor Delivers
A 5 HP rotary screw compressor sits at the entry point of industrial-grade compressed air. It is the smallest horsepower where continuous-duty rotary screw technology becomes practical, and it produces enough airflow for most one-to-two-person shops.
How Much Air a 5 HP Screw Compressor Actually Produces
Most quality 5 HP rotary screw compressors deliver 18 to 20 CFM at 100 to 125 PSI. At 145 PSI, output drops slightly to 16 to 18 CFM. That is 15 to 25% more air per horsepower than a comparable piston compressor, and it flows continuously without the pulsation that can affect spray finishes and precision tools.
Who Needs a 5 HP Screw Compressor
This size fits shops with one to three simultaneous air users running moderate-demand tools. If you operate an impact wrench, die grinder, or HVLP spray gun for several hours daily, a 5 HP screw compressor provides quiet, continuous air without the thermal cycling limits of a piston unit. For a broader comparison of screw and piston technology, see our screw vs piston compressor guide for small shops.
5 HP Screw Compressor Specifications by Brand
Not all 5 HP units are built alike. Below is a comparison of six established brands at this horsepower, using manufacturer-published specifications for tank-mounted or base-mounted models in standard configurations.
| Brand / Model | CFM @ 125 PSI | CFM @ 145 PSI | Noise | Voltage Options | Weight | Warranty | Price Range |
|---|---|---|---|---|---|---|---|
| Atlas Copco G4-145T | 18.0 | 16.5 | 66 dBA | Three-phase | 540 lbs | 5-year airend | USD 5,000 to USD 6,500 |
| Elgi EN04 | 19.3 | 17.0 | 64 dBA | Three-phase | 485 lbs | 6-year airend | USD 5,000 to USD 5,800 |
| Eaton 5 HP Fixed Speed | 19.0 | 17.0 | 65 dBA | Single-phase 230V | 560 lbs | 5-year airend | USD 4,200 to USD 5,200 |
| Eaton 5 HP VSD | 19.0 to 20.0 | 17.0 to 18.0 | 65 dBA | Single-phase 230V | 580 lbs | 5-year airend | USD 5,800 to USD 7,200 |
| Chicago Pneumatic QRS 5 | 18.1 | 16.0 | 64 dBA | Tri-voltage | 510 lbs | 5-year airend | USD 6,000 to USD 7,000 |
| Toledo Tools TT5 (FS-Curtis) | 18.4 | 16.5 | 65 dBA | Single-phase 230V | 525 lbs | 5-year airend | USD 4,000 to USD 5,000 |
| Kaeser SX 5 | 19.0 | 17.0 | 63 dBA | Three-phase | 495 lbs | 10-year motor | USD 6,500 to USD 8,000 |
Key Takeaways from the Comparison
Single-phase availability is the biggest differentiator. Only Eaton, Toledo Tools, and a few niche brands offer true 5 HP rotary screw compressors that run on standard 230V single-phase power. Atlas Copco, Elgi, and Kaeser focus on three-phase models at this HP, which limits their install base in home shops and small commercial spaces without industrial electrical service.
Need help choosing between configurations? Our complete buyer’s guide to 5-10 HP screw compressors covers the full range with sizing tables and application guidance.
Single-Phase vs Three-Phase: The Decision That Matters Most
At 5 HP, your available electrical supply often decides the machine for you. This is the practical reality most buyers discover too late.
Single-Phase 5 HP: What Your Shop Needs
A true 5 HP single-phase rotary screw compressor requires a dedicated 230V circuit with a 30 to 50 amp breaker, depending on inrush current. The motor draws roughly 25 to 32 amps during operation, but startup surge can briefly spike to 100 amps or more. You need:
- A dedicated circuit, not shared with other shop tools
- Minimum 10 AWG wire, preferably 8 AWG for longer runs
- A Type D or high-magnetic breaker that tolerates inrush without nuisance tripping
- A panel with sufficient capacity, typically 100 amp service minimum
If your shop is in a residential building or light commercial space with only standard 120/240V single-phase service, a single-phase 5 HP screw compressor is your practical ceiling without a major electrical upgrade.
Three-Phase 5 HP: When It Is Worth It
Three-phase 5 HP models draw roughly 12 to 18 amps per phase, spread evenly across three legs. The motor starts smoother, runs cooler, and typically carries a longer warranty. However, if your building does not already have three-phase service, adding it costs USD 3,000 to USD 15,000, depending on utility line distance. At exactly 5 HP, that upgrade rarely pays off unless you plan to grow into 7.5 or 10 HP within a few years.
Need a deeper electrical guide? See our article on single-phase vs three-phase screw compressors.
Electrical Requirements at a Glance
| Requirement | Single-Phase 5 HP | Three-Phase 5 HP |
|---|---|---|
| Voltage | 208 to 230V | 208 to 230V or 460V |
| Running amps | 25 to 32A | 12 to 18A per phase |
| Breaker size | 30 to 50A dedicated | 20 to 30A dedicated |
| Wire gauge | 10 AWG minimum | 12 to 14 AWG |
| Panel service | 100A minimum recommended | 100A minimum |
| Inrush current | Up to 100A+ | Minimal |
| Installation cost | USD 200 to USD 800 | USD 0 if existing, USD 3,000+ if new |
Tank-Mounted, Base-Mounted, or Total Air Station
The configuration you choose affects floor space, installation complexity, and how quickly you can put the system to work.
Tank-Mounted: Plug-and-Play Convenience
Tank-mounted units combine the compressor, motor, and receiver tank in one enclosure. Most 5 HP models ship with 53 to 80 gallon tanks. This is the simplest option for shops that want to connect power, run a discharge line, and start working. Expect a footprint of roughly 26 by 34 inches and a height of 45 to 55 inches.
Base-Mounted: Flexible Sizing
Base-mounted compressors have no tank included. You add a separate receiver sized to your needs. This lets you choose a larger tank for demand buffering or place the tank remotely to save floor space. The trade-off is additional plumbing and a second component to position and secure.
All-in-One with Dryer and Filter
Some 5 HP packages include an integrated refrigerated air dryer and coalescing filter. If you paint, powder coat, or run precision air tools, dry air is not optional. Moisture in compressed air ruins finishes and corrodes lines. An integrated dryer adds roughly USD 800 to USD 1,500 to the package price but eliminates a separate installation step.
What Can a 5 HP Screw Compressor Actually Run
This is where general specifications meet shop reality. A 5 HP screw compressor at 18 to 20 CFM can power one high-demand tool continuously, or several lower-demand tools in rotation.
Tool Compatibility for 5 HP at 18 CFM
| Tool | Average CFM @ 90 PSI | Can Run Continuously? | Notes |
|---|---|---|---|
| 1/2-inch impact wrench | 4 to 5 CFM | Yes | Two tools simultaneously possible |
| 3/8-inch air ratchet | 3 to 4 CFM | Yes | Easy load for 5 HP |
| HVLP spray gun | 10 to 14 CFM | Yes | One gun continuously; dry air critical |
| Die grinder | 4 to 6 CFM | Yes | Two tools simultaneously possible |
| Orbital sander | 8 to 12 CFM | Yes | One sander; monitor sustained load |
| Brad nailer | 1 to 2 CFM | Yes | Negligible load |
| Tire changer | 3 to 4 CFM | Yes | Easy load |
| Small blast cabinet | 12 to 18 CFM | Borderline | Need exact CFM spec; may max out unit |
5 HP Screw Compressor Price Ranges by Tier
Understanding what you get at each price level prevents both overpayment and underbuying.
Budget Tier: USD 3,500 to USD 5,000
Brands like HPDMC and some import-tier units fall here. You get a functional rotary screw compressor with basic enclosure and standard warranty. The risk is parts availability and service support. Verify that filters, separator elements, and controller parts are stocked in your region before buying.
Mid-Range Tier: USD 5,000 to USD 7,000
This is the sweet spot for most small shops. Eaton, Toledo Tools, and Elgi offer proven 5 HP models with good warranty terms, accessible parts, and single-phase options. You get digital controllers, reasonable noise levels, and reliable performance for moderate daily use.
Premium Tier: USD 7,000 to USD 10,000+
Atlas Copco, Chicago Pneumatic, and Kaeser dominate this tier. You pay for superior efficiency, longer service intervals, advanced controllers, and stronger local dealer networks. For shops running 1,500-plus hours per year, the energy savings and uptime reliability often justify the premium.
Installation and Space Requirements
A 5 HP rotary screw compressor is not a portable tool. Plan the install before the delivery truck arrives.
Floor Space and Clearance
A typical tank-mounted 5 HP unit measures roughly 26 inches wide by 34 inches deep by 50 inches tall and weighs 500 to 600 pounds. You need level flooring that can support that load, plus 18 to 24 inches of clearance on all sides for airflow and maintenance access.
Ventilation and Air Intake
Rotary screw compressors need cool, clean intake air. Avoid placing the unit near grinding dust, chemical vapors, or heat sources. If your shop runs hot in summer, add ventilation or consider a compressor with a higher ambient temperature rating.
Piping Basics
Run hard pipe or quality flexible hose from the compressor discharge to your tools. Include a drop leg with a moisture drain at each workstation. Avoid PVC pipe for compressed air; it is unsafe and violates most building codes.
Maintenance Reality for 5 HP Units
Rotary screw compressors require less frequent maintenance than piston units, but the parts are more specialized.
Annual Maintenance Schedule
| Interval | Task | Estimated Cost |
|---|---|---|
| Every 4,000 hours or 12 months | Oil and oil filter change | USD 40 to USD 80 |
| Every 4,000 hours or 12 months | Air filter replacement | USD 30 to USD 60 |
| Every 4,000 to 8,000 hours | Oil separator replacement | USD 80 to USD 150 |
| Annually | Belt inspection, leak check, drain valve test | USD 0 if DIY |
| As needed | Controller software update | USD 0 |
Annual Parts Cost
Expect to spend USD 150 to USD 300 per year on routine maintenance parts for a 5 HP oil-injected screw compressor. Labor adds another USD 100 to USD 200 if you hire a technician for oil changes and inspections. Compared to a piston compressor, valve and ring replacements are eliminated, which offsets the higher oil and separator costs over time.
Real Shop Scenarios: Three Owners Share Their 5 HP Setup
Jake’s Home Garage, Portland, Oregon
Jake runs a one-person woodworking business from a detached 24- by 28-foot garage with standard 200A single-phase service. He bought a Toledo Tools TT5 5 HP base-mounted compressor paired with a separate 60-gallon tank for USD 4,800 total. The unit runs on a dedicated 30A 230V circuit. Jake powers a brad nailer, HVLP spray gun, and an occasional impact wrench. The 65 dBA noise level is quiet enough that neighbors do not complain. Annual maintenance costs him roughly USD 180 in filters and oil. His only regret: he wishes he had bought the tank-mounted package to save installation time.
Maria’s Two-Bay Auto Shop, Tampa, Florida
Maria’s shop had three-phase power already installed for a lift and welder. She chose an Atlas Copco G4 tank-mounted unit at USD 6,200. The 18 CFM output handles two impact wrenches and a tire changer running in rotation across two bays. During Florida summers, the enclosed cabinet keeps the airend cool even at 95-degree ambient temperatures. She pays a local service company USD 280 per year for maintenance. The five-year airend warranty and local dealer support were decisive factors in her purchase.
David’s Small Metal Fab, Columbus, Ohio
David bought a used 7.5 HP three-phase compressor from an industrial auction, then realized his shop only had single-phase power. He installed a rotary phase converter for USD 2,400 and connected the used unit. Total investment: USD 5,800 for the compressor plus USD 2,400 for the converter, plus USD 800 in electrical work. In retrospect, David says he would have bought a new single-phase 5 HP unit for roughly the same total cost and avoided the complexity. His lesson: match the machine to your existing power before you fall in love with a deal.
5 HP vs 7.5 HP: Should You Size Up
The price gap between 5 HP and 7.5 HP is typically USD 1,000 to USD 1,500. If you are on the fence, consider three factors.
First, count your simultaneous tool demand. If two workers regularly need air at the same time, 7.5 HP gives you a 25 to 30 CFM buffer that prevents pressure drop during peak use. Second, consider future growth. If you plan to add a blast cabinet or a second spray booth within two years, the upgrade cost is cheaper now than a full replacement later. Third, check your electrical capacity. Many 7.5 HP units require three-phase power, which changes the entire install equation.
For a shop with one primary user and no major expansion plans, 5 HP is the right size. Oversizing wastes energy and the purchase budget.
Need a deep dive on a specific size? See our dedicated guides for 10 HP screw compressors.
Frequently Asked Questions
Is a 5 HP screw compressor enough for an auto shop?
For a one-to-two-bay shop with one technician working at a time, yes. A 5 HP unit at 18 to 20 CFM handles impact wrenches, ratchets, and tire equipment comfortably. If two technicians regularly work simultaneously, consider 7.5 HP.
How many CFM does a 5 HP screw compressor produce?
Most quality 5 HP rotary screw compressors produce 18 to 20 CFM at 100 to 125 PSI. At higher pressures like 145 PSI, output drops to 16 to 18 CFM. Always check the manufacturer’s CFM rating at your required operating pressure.
Can a 5 HP screw compressor run on single-phase power?
Yes, but only specific models. Eaton, Toledo Tools, and some specialty brands build true 5 HP rotary screw compressors for 208 to 230V single-phase service. Atlas Copco, Elgi, and Kaeser typically offer three-phase only at 5 HP. Verify voltage before you buy.
What size breaker do I need for a 5 HP air compressor?
A single-phase 5 HP compressor needs a dedicated 30 to 50 amp breaker, preferably Type D or high-magnetic, to handle startup inrush. Three-phase 5 HP models need a 20 to 30 amp three-pole breaker. Always have a licensed electrician verify your panel capacity.
Conclusion: Is a 5 HP Screw Compressor Right for Your Shop
A 5 HP screw compressor is the entry point to rotary screw reliability, quiet operation, and continuous-duty performance. It fits one-to-three-person shops with moderate air demand, delivers 18 to 20 CFM of steady airflow, and runs for years with basic annual maintenance costing under USD 300 in parts.
The key decision is electrical: if you have single-phase power, narrow your search to the three or four brands that build true 5 HP single-phase models. If you have three-phase, your options expand but so does your budget. Either way, match the machine to your tools, your power, and your floor space before you buy.
Shandong Loyal Machinery manufactures 5 HP rotary screw compressors for global export in both single-phase and three-phase configurations. We customize voltage, pressure settings, and tank sizing to match regional requirements. If you are sizing a system and need exact specs for your shop’s power and tool list, contact our team for a tailored recommendation.