{"product_id":"castair-25hp-3-phase-industrial-air-compressor-horizontal-tank-w-mounted-starter-i25312hc4z-s","title":"Castair 25HP 3-Phase Industrial Air Compressor  Horizontal Tank w\/ Mounted Starter - I25312HC4Z-S","description":"\u003ch2\u003eCastair I25312HC4Z-S: 25HP 3-Phase Industrial Air Compressor — 120 Gallon Horizontal with Mounted Starter\u003c\/h2\u003e\n\n\u003cp\u003eThe Castair I25312HC4Z-S is a 25-horsepower, 3-phase, 120-gallon horizontal industrial air compressor built on the C4 cast iron pump with a factory-mounted magnetic motor starter. This is the 25HP configuration of the same C4 pump platform used in the 20HP models — the difference is motor size and resulting RPM. At 25HP, the C4 pump runs at 710 RPM and delivers 109 CFM free air and 90 CFM at 175 PSI, making this one of the higher-output reciprocating compressors in Castair's lineup.\u003c\/p\u003e\n\n\u003cp\u003eFor a busy production shop, body shop, or industrial facility where demand regularly runs 75-90 CFM at pressure, the I25312HC4Z-S is the right size. Below that, you are paying for horsepower you are not using. Above 90 CFM continuous demand, look at the 30HP I30324HC4Z-S.\u003c\/p\u003e\n\n\u003cp\u003eThe 120-gallon horizontal tank is appropriate when floor footprint and ceiling height are both constraints. The same pump is available with a 240-gallon tank as the I25324HC4Z-S — if your demand pattern includes high-volume spikes rather than steady consumption, the larger tank handles those peaks better.\u003c\/p\u003e\n\n\u003ch2\u003eC4 Pump — Core Engineering\u003c\/h2\u003e\n\n\u003ch3\u003ePump Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump designation:\u003c\/strong\u003e C4 — Two-stage, V4 cylinder configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated HP range:\u003c\/strong\u003e 15-25HP — the 25HP application is within the designed operating range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump RPM at 25HP:\u003c\/strong\u003e 710\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder arrangement:\u003c\/strong\u003e V4 — four cylinders in a V configuration for smooth, balanced operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil capacity:\u003c\/strong\u003e 1 gallon\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e 100% cast iron — cylinders, heads, valve plates, crankcase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearings:\u003c\/strong\u003e Tapered roller bearings at both crankshaft ends\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnecting rods:\u003c\/strong\u003e Precision steel with automotive-type rod insert bearings at crankshaft and wrist pin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValves:\u003c\/strong\u003e Disc and spring design — field-replaceable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePistons:\u003c\/strong\u003e 4-ring configuration for efficiency and low oil carry-over\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnloader:\u003c\/strong\u003e Centrifugal — loadless start-up on every cycle\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTank and Frame\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank capacity:\u003c\/strong\u003e 120 gallons, horizontal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank construction:\u003c\/strong\u003e Powder-coated ASME-rated steel with channel saddle frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety valve:\u003c\/strong\u003e ASME-rated, factory installed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt guard:\u003c\/strong\u003e Totally enclosed metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarge lines:\u003c\/strong\u003e Copper tubing or stainless braided flex line\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMotor and Electrical\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 25HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e 3-phase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor speed:\u003c\/strong\u003e 1725 RPM industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService factor:\u003c\/strong\u003e 15% minimum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor starter:\u003c\/strong\u003e Factory-mounted magnetic motor starter (Z designation)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax working pressure:\u003c\/strong\u003e 175 PSI\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePerformance Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor output:\u003c\/strong\u003e 25 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical:\u003c\/strong\u003e 3-phase with factory-mounted magnetic starter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank capacity:\u003c\/strong\u003e 120 gallons, horizontal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump:\u003c\/strong\u003e C4 (Two-stage, V4)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 710\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree air delivery (0 PSI):\u003c\/strong\u003e 109 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDelivery at 175 PSI:\u003c\/strong\u003e 90 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax pressure:\u003c\/strong\u003e 175 PSI\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eDimensions and weight: Contact us for current shipping specs on the 120-gallon C4Z configuration. The 240-gallon version (I25324HC4Z-S) is 90x39x70 at 1,725 lbs.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCastair I25312HC4Z-S compressor — fully assembled\u003c\/li\u003e\n\u003cli\u003eFactory-mounted magnetic motor starter (Z designation)\u003c\/li\u003e\n\u003cli\u003eASME safety valve (factory installed)\u003c\/li\u003e\n\u003cli\u003ePressure switch with unloader\u003c\/li\u003e\n\u003cli\u003eTotally enclosed metal belt guard\u003c\/li\u003e\n\u003cli\u003eCopper discharge and unloader tubing (or stainless braided flex line)\u003c\/li\u003e\n\u003cli\u003eOwner's documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eAftercooler not included — available as factory option BGAC3M (for 20HP and up). Electrical connection to 3-phase service by licensed electrician.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eAvailable Configurations — 25HP Industrial Series\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eI25312HC4Z-S (this unit):\u003c\/strong\u003e 25HP, 3-phase, 120gal Horizontal, C4 pump, 710 RPM, 90 CFM @ 175 PSI, mounted starter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI25324HC4Z-S:\u003c\/strong\u003e 25HP, 3-phase, 240gal Horizontal, C4 pump, 710 RPM, 90 CFM @ 175 PSI, 90x39x70, 1,725 lbs — same pump, double the storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eComparing the 20HP and 25HP on the C4 platform:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e20HP (I20324HC4Z-S):\u003c\/strong\u003e 519 RPM, 72 CFM @ 175 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25HP (I25312HC4Z-S):\u003c\/strong\u003e 710 RPM, 90 CFM @ 175 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30HP (I30324HC4Z-S):\u003c\/strong\u003e 794 RPM, 105 CFM @ 175 PSI\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMoving from 20HP to 25HP adds 18 CFM at 175 PSI — a 25% increase in usable output from the same pump. If your shop is consistently running at the top end of 20HP capacity, the 25HP step-up makes a real difference in how many simultaneous users the system can support without pressure drop.\u003c\/p\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous air demand of 75-90 CFM at 175 PSI — large body shop, production facility, or multi-bay automotive service operation\u003c\/li\u003e\n\u003cli\u003e3-phase electrical service is available and adequate for a 25HP motor load\u003c\/li\u003e\n\u003cli\u003eYou need a factory-mounted starter for code compliance or simplified installation\u003c\/li\u003e\n\u003cli\u003eThe 120-gallon tank footprint fits your installation space and your demand is steady enough to not require the 240-gallon buffer\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h2\u003e\n\u003cp\u003eSince 2016, we have helped shops and facilities size, purchase, and install industrial air compressors. At 25HP, this is a significant capital purchase. We will help you verify that your electrical service is adequate, confirm the installation footprint works, and advise on aftercooler options based on your actual processes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e to commercial addresses in the lower 48 states\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support\u003c\/strong\u003e at 866-217-0063\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFull Castair manufacturer warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest sizing guidance\u003c\/strong\u003e — we will tell you if the 20HP or 30HP is more appropriate for your load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorized dealer\u003c\/strong\u003e with direct Castair factory support\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342561665237,"sku":"I25312HC4Z-S","price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-25hp-3-phase-industrial-air-compressor-horizontal-tank-w-mounted-starter-i25312hc4z-s","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}