{"product_id":"castair-3-bx76","title":"Castair 3-BX76","description":"\u003cp\u003eThe Castair 3-BX76 is a BX-section cogged V-belt with a 76-inch outside circumference, intended as a direct replacement for Cast Air compressor drives that specify this belt. The SKU designation tells the whole story: BX means cogged (notched underside), and 76 is the outside circumference in inches. If your machine left the factory with a cogged belt in this length, this is what goes back on it. Note that product data on file for this SKU is minimal — no price is currently listed, and manufacturer documentation was not available at time of writing. Call 866-217-0063 to confirm current pricing, stock, and fitment for your specific Cast Air model and serial number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eCogged Belt Advantages\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced bending stress:\u003c\/strong\u003e The transverse notches molded into the underside of the BX belt allow it to flex more freely as it wraps around sheave grooves. A solid-back B-section belt resists that flex, and under sustained load or frequent cycling, that resistance converts to heat. The cogged profile eliminates the stiff underside — each revolution of a 76-inch belt around the drive pulleys puts measurably less mechanical stress on the belt carcass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooler operation:\u003c\/strong\u003e The notch pattern creates air channels as the belt moves through the drive. On a compressor running continuous or near-continuous duty cycles, belt temperature directly affects service life. Cogged belts run cooler than classical belts under comparable loads — this is a repeatable, measurable difference, not marketing copy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBetter flex and fatigue resistance:\u003c\/strong\u003e Less bending resistance means less heat generation, which means longer belt life. In high-cycle compressor environments — shops running spray booths, production lines, or multi-shift operations — this difference compounds over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher power transmission efficiency:\u003c\/strong\u003e Cogged belts deliver approximately 2% more power transmission efficiency versus classical wrapped V-belts of the same section. On a large compressor motor pulling significant amperage, that efficiency difference reduces energy consumption per duty cycle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame sheave compatibility as B-section:\u003c\/strong\u003e The BX cross-section geometry is identical to a standard B-section belt — 21\/32\" top width, 13\/32\" depth. It seats directly in any B-groove sheave. No pulley changes, no hardware modifications required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBelt Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt designation:\u003c\/strong\u003e 3-BX76 (Castair \/ Cast Air OEM part number)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection profile:\u003c\/strong\u003e BX — cogged\/notched B-section\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop width:\u003c\/strong\u003e 21\/32 inch (0.656\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDepth:\u003c\/strong\u003e 13\/32 inch (0.406\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside circumference:\u003c\/strong\u003e 76 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner construction:\u003c\/strong\u003e Transverse notched (cogged) underside — molded notches reduce bending resistance and promote airflow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCord type:\u003c\/strong\u003e Polyester tension member (standard BX construction)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e Not currently on file — call 866-217-0063 for current pricing and availability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Manufacturer documentation for this specific SKU was not available at time of writing. Specifications are derived from the standard BX belt designation. Confirm compatibility with your Cast Air model and serial number before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility and Fit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eB-groove sheave compatible:\u003c\/strong\u003e The BX section fits any standard B-section sheave groove. No special pulley required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCastair \/ Cast Air compressors:\u003c\/strong\u003e This belt is intended for Cast Air compressor models that specify a BX76 cogged drive belt. Verify against your compressor's parts list or the belt currently on the machine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo not substitute a classical B76:\u003c\/strong\u003e If your machine was originally fitted with a cogged BX76, a smooth-back B76 will physically fit the sheave but will run hotter and wear faster under the same load. Match what the OEM specified.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfirm your model:\u003c\/strong\u003e Because product data for this SKU is limited, we strongly recommend calling 866-217-0063 before ordering. Give us your Cast Air model and serial number and we will cross-reference the correct belt for your machine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to Choose Cogged Over Standard\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-cycle duty:\u003c\/strong\u003e Compressors that cycle frequently — any busy shop environment — accumulate flex fatigue faster than lightly loaded drives. Cogged belts are better suited to high-cycle applications than classical belts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable pitch drives:\u003c\/strong\u003e Drives with adjustable-pitch or variable-speed sheaves benefit from the lower bending resistance of cogged belts, which conform more readily to changing effective diameters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat buildup concerns:\u003c\/strong\u003e If you have experienced premature belt failure from heat cracking — especially in warm compressor rooms — a cogged belt is the right direction. The notch airflow effect is real and reduces operating temperature under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLonger service interval goals:\u003c\/strong\u003e Shops targeting annual belt replacement instead of twice-yearly should start with a cogged belt, confirm proper tension, and verify sheave condition. The reduced thermal load and lower fatigue stress directly extend service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM specification:\u003c\/strong\u003e If Cast Air built the machine with a cogged belt, that is the answer. Use what the OEM specified.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelieve tension before removal:\u003c\/strong\u003e Loosen the motor mounting bolts or slide the motor along the adjustment slots to create slack. Never pry a V-belt over a sheave — this damages the internal cord and causes early failure that can look like a defective belt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInspect sheaves before installing the new belt:\u003c\/strong\u003e Check for worn groove walls, sharp edges from corrosion or wear, or off-center patterns that indicate misalignment. A damaged sheave destroys a new belt quickly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet tension to specification:\u003c\/strong\u003e Use the Cast Air service documentation for the correct deflection specification for this belt length and drive arrangement. Over-tension overloads shaft bearings; under-tension causes slip and heat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck alignment:\u003c\/strong\u003e Lay a straightedge across the sheave faces and verify they are co-planar. Sheave misalignment causes edge loading and dramatically shortens belt life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRun-in period:\u003c\/strong\u003e New belts seat into sheave grooves during initial operation. Recheck tension after the first 30 minutes of run time and again after 24 hours of service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible cracking:\u003c\/strong\u003e Cracks across the belt face or through the sidewalls indicate rubber compound hardening. Replace immediately — a cracked belt is a belt close to failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFraying or cord exposure:\u003c\/strong\u003e Visible cord fibers through the belt cover mean the tensile member is exposed. Failure is imminent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlazed sidewalls:\u003c\/strong\u003e A shiny, hard sidewall surface means the belt has been slipping. Find and correct the cause — low tension, sheave wear, or overload — before installing a new belt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquealing under load or on startup:\u003c\/strong\u003e Belt squeal is usually a tension problem but can indicate sheave damage or sidewall wear. Diagnose the root cause before replacing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnusual vibration from the drive:\u003c\/strong\u003e Uneven stretch, flat spots, or internal damage can cause vibration. Inspect the full belt circumference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScheduled replacement:\u003c\/strong\u003e Replace belts on a fixed interval regardless of visual condition — at minimum annually in active shop environments. Belt cost is trivial compared to compressor downtime.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eAir Compressor Factory Direct has specialized in compressor parts, belts, and accessories since 2016. We carry replacement belts — classical and cogged — for Cast Air, Castair, and a wide range of industrial compressor brands. When you call us, you are speaking with someone who knows compressor drives and can cross-reference your model and serial number to confirm the correct belt before you order. For this SKU specifically, we recommend calling first — product data is limited and we want to make sure you get the right part.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLive technical support:\u003c\/strong\u003e 866-217-0063 — talk to a compressor specialist\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e on all belts we sell\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest fitment guidance:\u003c\/strong\u003e If this is not the right belt for your machine, we will tell you before the order goes through\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":53342506844373,"sku":"3-BX76","price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-3-bx76","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}