AMI KH203 hanger bearing unit with 17mm bore and eccentric collar locking. Normal duty rating with chrome steel insert and narrow inner ring width. Precision-engineered for reliable shaft support in industrial applications.

The prefix gives material, inner ring width, outside diameter and locking. UC is a 52100 steel wide inner ring insert with a spherical OD and set screws; UCX is medium duty and UC300 heavy duty. UG uses an eccentric collar, UE an Accu-Loc concentric collar, and UK an adapter sleeve (sold as UK+H). B and KH are narrow inner ring set screw and eccentric types. SER and SUE have a cylindrical OD with a snap ring (set screw and Accu-Loc); UR, BR and KHR are cylindrical without one. MUC, MSER and MB are 440C stainless versions. Suffix MZ2 means zinc protected and MZ20 Kanigen protected. AMI also marks the inner ring and slinger to help identify an insert in hand.

AMI publishes a direct interchange for its inserts. UC205-16 matches Dodge INS-SC-100, SealMaster 2-1, Browning VS-216 and Link-Belt UG216NL. UE205-16 (Accu-Loc) matches Dodge INS-DL-100 and SealMaster 2-1T. KH205-16 (narrow eccentric) matches Dodge INS-SXV-100 and SealMaster V-16E. For cylindrical OD inserts, SER205-16 matches SealMaster ER-16 and Browning VER-216, and SUE205-16 matches SealMaster ER-16T. AMI's own advice: an insert of the same ring size will usually fit another brand's housing, but the grease path may not line up, so relubrication can be a problem; AMI intends its inserts for AMI housings. The housing seat must also be in good condition.

AMI's set screw torques in in-lbf: UC201 to UC203 and UCX05, 35; UC204 to UC206, 43; UCX06 to UCX08, 74; UC207 to UC209, 104; UCX09 to UCX12, 143; UC210 to UC213, 208; UC214 to UC216, 347; UC217 to UC218, 247. Narrow B5 to B6 inserts take 43, B7 to B8 104. Tighten screw A to half torque, B to full, then A to full. For eccentric collars, turn the collar by hand in the running direction, tap it home with a drift pin, then tighten the screw: UG204 to UG205 and KH201 to KH205, 43; UG206 and KH206, 104; UG207 to UG210 and KH207 to KH210, 208; UG211 to UG212 and KH211, 234. KHR matches KH.

Accu-Loc (UE and SUE inserts) is AMI's concentric collar. Fit the collar on the inner ring tangs with the chamfered corner of its bore toward the bearing, so the word FRONT faces out, then torque the single cap screw. AMI's figures in in-lbf: UE204-12 to UE206-20, 60; UE207-20 to UE209-28, 90; UE210-31 to UE211-32, 140; UE212-39, 250; metric UE204 to UE206, 35. AMI recommends Accu-Loc for higher speeds and low vibration because it centres the shaft and does not mark it, but not for axial loading. Shaft tolerance is nominal to -0.0005 in up to 1-15/16 in.

AMI inserts ship prelubricated and need no grease before start-up. AMI confirms the fill for every insert in its Mounted Bearing Units catalog is Shell Gadus S2 V100 #3, a lithium NLGI 3 grease rated -13F to 265F. Corrosion protection inserts (stainless, Kanigen and zinc plated) ship with Citgo Clarion HTEP #2 H1 food grade grease, high temperature C4HR5 and C4HR23 inserts use their own greases, and free spinning FS inserts are oil lubricated, so relubricate with the same type: mixing incompatible greases can harden or soften the mix. AMI's catalog intervals in a clean environment are 12 months up to 122F, 6 months up to 158F and 3 months up to 212F, and 6 months, 2 months and 2 weeks in dirty conditions, though AMI says the right frequency depends on the application.

Indexable inserts are more economical because you rotate or replace only the cutting edge once it wears, not the entire tool body. This reduces tool cost per cutting edge and minimizes machine downtime compared to resharpening solid carbide tools.

Yes, you should replace O-rings and seals when installing a new cartridge, especially in older systems. Worn or hardened O-rings can cause bypass leaks and reduce filter effectiveness, even with fresh media.

ISO 1832 provides a standardized code describing the insert's geometry, size, thickness, radius, and material grade. Reading this code correctly ensures you select the right insert for your machine setup and workpiece material.

P-grade inserts are optimized for steel machining, M-grade for stainless steel, and K-grade for cast iron and nonferrous materials. Each grade balances hardness and toughness differently based on the workpiece material and cutting conditions you're working with.

Most filter cartridges remain effective for 3–5 years in dry, cool storage conditions. Pleated media can harden or crack in extreme heat or humidity, so store cartridges in controlled conditions away from direct sunlight and moisture.

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.

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.

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.

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.

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.

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.

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.

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.

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.