Rex ZT85207 8000 series Type-E integral lock take-up bearing insert with 2-7/16 in (61.91 mm) bore. Cast iron housing with double setscrew locking collar and standard clearance seal. Designed for use in take-up frames in conveyor and material handling applications.

Take-up units arrive pre-lubricated and ready for installation; relubrication intervals depend on bore size, operating speed, and temperature. In standard conditions, relubrication is typically needed at 500–2,000-hour intervals; reduce intervals by 50% in contaminated, high-temperature, or high-moisture environments.

Speed ratings decrease with bore size. Smaller take-up units are rated for higher speeds with proper lubrication, while larger units are limited to lower speeds due to increased radial mass. Consult the manufacturer's technical datasheet for your specific unit size to confirm maximum operating speed for your application.

Load capacity varies by unit size—for example, the UCT 205 (25mm bore) carries a dynamic load rating of 14 kN and static load rating of 7.85 kN. Larger bores provide proportionally higher load capacity; choose the unit based on your belt tension and application demands.

Take-up bearing units maintain proper tension on conveyor belts and chain drives while keeping the belt aligned. The adjustable bearing housing allows precise tension control by rotating a take-up screw, ensuring consistent power transmission and extended belt life.

Standard UCT take-up units range from 12mm to 75mm bore diameters, with common sizes including UCT 205 (25mm), UCT 207 (35mm), and UCT 214 (70mm). Selection depends on the shaft diameter and load requirements of your conveyor or drive system.

Common types include frame-mounted take-ups (mounted within frame structures for conveyor systems), center-pull units (featuring a pull-style design for easy adjustment in space-constrained applications), and top-angle units (angled designs for addressing misalignment issues). Each type is optimized for different mounting configurations, load directions, and installation environments.

A take-up bearing is a specialized mounted bearing unit designed to maintain proper tension in belts, chains, and other flexible drive elements while supporting rotating shafts. The bearing combines a standard ball or roller bearing insert with an adjustable housing that permits controlled movement along a linear path, enabling engineers to adjust shaft positioning and maintain optimal tension as components stretch or wear over time.

Key specifications include bore diameter (shaft size), load capacity (static and dynamic ratings), speed rating (RPM limit), housing material (cast iron or pressed steel), and adjustment type (screw, eccentric collar, or adapter sleeve). Typical bore sizes range from 12mm to larger diameters, with load capacities and speed ratings varying based on the bearing type and housing design; pre-lubricated units often use premium greases like Chevron SRI-2 for extended intervals between relubrication.

Take-up bearings are essential in conveyor systems, agricultural machinery, material handling equipment, and industrial drive systems across food processing, manufacturing, mining, construction, and quarrying industries. They support both radial and axial loads while maintaining proper belt or chain tension to prevent slippage and reduce vibration and wear.

Take-up bearings feature a sliding slot or threaded adjustment mechanism in their cast iron or pressed steel housing that allows axial movement of the bearing assembly. By repositioning the bearing along the frame using a screw or similar device, operators can adjust the distance between pulleys to increase or decrease belt tension without extensive disassembly of the conveyor system.

Pillow blocks mount parallel to the shaft (shaft runs horizontally along the base), while flange blocks mount perpendicular to the shaft (shaft extends out from the face). Choose pillow blocks for shafts that are level with your mounting surface; choose flange blocks when the shaft is perpendicular to your mount point.

Match the bore diameter to your shaft size, then verify the dynamic load rating (C) exceeds your expected radial load. For radial loads, use C ≥ 3× your maximum load as a conservative starting point. Check speed rating against your RPM—pillow blocks typically handle 3,000–4,000 rpm while flange units can push 5,000+ rpm depending on bolt strength and bearing series.

Use the bearing manufacturer's recommended grease grade and relubricate at intervals matched to your speed and load—heavy-duty applications may need monthly service, while light-duty runs can extend to 6–12 months. Over-greasing creates drag and heat; under-greasing causes metal-to-metal contact. Wipe off excess grease to prevent contamination.

2-bolt (diamond) flanges fit tight spaces and light-to-moderate loads. Switch to 4-bolt (square) flanges for cantilevered (overhung) loads, torque reversal, or shafts over 50mm—the extra bolts distribute load more evenly and resist side thrust better.

Align the bearing housing parallel to the shaft using a straightedge or dial indicator—misalignment is a leading cause of premature wear. Tighten mounting bolts in a cross pattern to seat the housing evenly. Use a soft mallet to tap the bearing unit into place; never force it. Check alignment after installation.

Use the formula (OD in mm) × (Width in mm) × 0.005 = grams for periodic relubrication of the bearing element only; initial housing cavity fill is separate and should be 30–50% of free volume. Over-greasing damages seals and generates excess heat—stick to the calculated quantity and recommended relubrication schedule.

Monitor housing surface temperature (the standard MRO measurement point): 40–65°C is normal, 70–75°C warrants investigation of misalignment or over-greasing, and 80°C requires immediate shutdown. The inner race runs 15–30°C hotter than the housing surface, so an 80°C housing reading means lubricant degradation is accelerating and the bearing requires emergency diagnosis.

Replace based on condition: vibration signature analysis or ultrasonic emission (detected with a hand-held meter) indicates wear hours or days before audible noise appears, and is the actionable MRO signal. Other replacement triggers include continuous operation above 80°C housing temperature, visible grease leakage, or reaching the manufacturer's service interval for your duty cycle. Scheduled relubrication and temperature monitoring extend service life significantly — replacement is a last resort, not preventive maintenance.

Mounted bearings come in four main forms: pillow blocks (flat-base, shaft parallel to mounting surface), flange mounts (perpendicular shaft, available in 2-bolt and 4-bolt variants with different radial ratings), hanger bearings (overhead support for long horizontal shafts), and take-up frames (adjustable center-distance units for belt or chain drive tensioning). Select based on your shaft orientation, load direction, and space constraints.

Verify your shaft diameter is within the bearing bore tolerance (consult the NSK or SKF datasheet), then secure the bearing to the mounting surface using the specified bolt torque and engage the locking collar or set-screw on the shaft to prevent axial slip. Hand-rotate the shaft through several complete turns with a dial indicator, laser alignment tool, or feeler gauge to confirm smooth operation and proper shaft runout within spec.

Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints. For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials. In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design.

Standard bearing materials include: - Chrome Steel — Premium bearing steel used by SKF, NSK, Timken, and most manufacturers. Offers excellent hardness, fatigue resistance, and durability in standard industrial applications. Most common for ball and roller bearings. - Stainless Steel — Provides corrosion resistance for applications in wet, humid, or chemically corrosive environments. Used in food processing, marine, and pharmaceutical equipment. - Ceramic Hybrid Bearings — Combine steel races with ceramic rolling elements. Offer reduced friction, lower heat generation, and higher temperature capability. Used in high-speed, high-precision applications and aerospace. - Polymeric Bearings — Utilize fluoropolymer composites with embedded graphite or PTFE. Provide low friction in high-speed applications where lubrication film breakdown would be problematic. Material selection depends on operating environment (temperature, moisture, chemical exposure), speed, load, and precision requirements. Standard chrome steel bearings suit most industrial MRO applications.

L10 Life Definition (ISO 281) — L10 is the basic rating life at which 90% of a large group of identical bearings are statistically expected to survive under constant load and speed. It is calculated in millions of revolutions using the formula: L10 = (C/P)^p, where C is the basic dynamic load rating, P is the equivalent dynamic bearing load, and p is the life exponent (3 for ball bearings). Converting L10 to Operating Hours — To express L10 life in hours: L10h = (L10 × 10^6) / (60 × n), where n is rotational speed in RPM. For example, a bearing with L10 = 1,000 million revolutions operating at 3,600 RPM has approximately L10h ≈ 4,630 hours. Modified Life (L10a) — Actual bearing life also depends on lubrication quality, contamination, speed, temperature, and bearing accuracy. ISO 281 defines a modified life factor (a₁ × aISO) that adjusts the theoretical L10 for these real-world conditions. High-quality lubrication and proper maintenance can extend bearing life significantly; poor lubrication or high contamination reduces it. Why It Matters for Maintenance — L10 life helps you schedule preventive maintenance, budget for bearing replacement, and select bearings adequate for your duty cycle.

A bearing is a mechanical component that enables smooth rotational or linear motion by reducing friction between moving parts. Bearings support loads and facilitate the transfer of forces between moving elements, preventing direct metal-to-metal contact that would cause wear and heat buildup. Rolling element bearings contain balls or rollers that rotate within races (raceways) to minimize friction. Common types include ball bearings (used for moderate loads and high speeds), roller bearings (used for heavy loads at medium speeds), and angular contact bearings (designed for combined radial and axial loads). Bearings are essential in industrial equipment including motors, pumps, compressors, gearboxes, turbines, and conveyor systems.

Static Load Rating (C₀) — The maximum load a stationary or slowly rotating bearing can support without permanent deformation of its rolling elements or raceways. Defined by ISO 76 as the load producing 0.01% permanent deformation of the rolling element diameter. Static load capacity is the limiting factor when a bearing operates at very low speeds or remains stationary under heavy loads. Dynamic Load Rating (C) — The constant load a bearing can endure for a specified number of revolutions (the L10 life, at which 90% of identical bearings are expected to survive). Dynamic load rating determines how long a bearing will last under rotating or oscillating motion. ISO 281 defines the L10 calculation using the formula: L10 = (C/P)^p, where C is dynamic load rating, P is equivalent dynamic load, and p is the life exponent (3 for ball bearings, 10/3 for roller bearings). Why They Matter — Static load rating determines if a bearing can handle peak loads without permanent damage (even if not rotating). Dynamic load rating determines operational life. For high-speed applications, dynamic rating is critical. For low-speed or stationary loads, static rating may be the limiting factor. Always verify both ratings against your application's load profile.

Lubrication Importance — Improper lubrication causes over 40% of bearing failures. Proper bearing lubrication prevents friction damage, dissipates heat, protects against corrosion, and acts as a barrier against contaminants (dust, moisture, debris). Lubrication Selection — Choose between grease and oil based on: - Grease: Suitable for low-to-medium speed, sealed bearings, and applications without continuous circulation. Easier to apply and retain. Common for motors, household appliances, and sealed units. - Oil Mist or Circulating Systems: Better for high-speed applications, high-temperature environments, and heavy-load machinery where heat dissipation is critical. Best Practices: 1. Map all lubrication points and create a maintenance schedule. 2. Use the correct lubricant type and viscosity grade specified by the bearing manufacturer. 3. Store lubricants in sealed, labeled containers away from moisture and contaminants. 4. Monitor bearing temperature and vibration; unusual heat or noise may indicate inadequate lubrication or bearing wear. 5. Replace bearings before reaching L10 life if contamination or lubrication failure is detected.

Bearing selection depends on five key factors: 1. Load Type and Direction — Determine whether your application has radial loads (perpendicular to shaft), axial loads (along the shaft), or combined loads. Deep groove ball bearings suit primarily radial loads; tapered roller bearings excel at combined loads; thrust bearings handle pure axial forces. 2. Rotational Speed — Ball bearings support higher speeds with lower friction. Roller bearings are better for medium-speed, heavy-load applications. Verify bearing speed ratings against your operating RPM. 3. Load Capacity — Select a bearing with adequate load capacity for your application. Basic dynamic load rating (C) and basic static load rating (C₀) determine how much load the bearing can safely carry. 4. Lubrication Requirements — Choose between grease and oil lubrication based on speed, temperature, and load. High-speed or high-temperature applications typically require oil circulation; lower-speed applications can use grease. 5. Precision and Rigidity — Evaluate your application's tolerance for runout deviation. High-precision applications require tighter tolerances and higher-grade bearings.