UEP200 Series Pillow Block Bearing Units — Concentric Locking Collar for High-Speed Drives
Where shaft speed is high enough that an eccentric collar's slight mass imbalance becomes a dynamic concern, or where the drive runs in both directions and a setscrew's retention margin is considered insufficient, the UEP200 series offers a third path: a specially designed concentric locking collar that contacts the shaft uniformly around the full 360 degrees of its bore circumference. This distributed clamping geometry makes the UEP200 uniquely suitable for high-speed shafts that also run in either direction.
Concentric Locking Collar — Engineering Rationale
The UEP200 insert bearing carries an extended inner ring on one side, machined with an external taper. A matching tapered collar nut threads onto this extension and, when tightened, is drawn concentrically inward — applying uniform radial clamping pressure to the shaft without any geometric eccentricity. Because the collar mass is perfectly centred on the shaft axis, the UEP200 generates no detectable imbalance force at any operating speed within the bearing's rated range.
The concentric locking mechanism also produces a more uniform shaft contact stress than a setscrew's two point-contact faces, reducing the risk of brinelling or fretting damage to precision ground shafts. Unlike the eccentric collar of the NAP200, the concentric collar releases equally in both directions — making the UEP200 fully bidirectional without the risk of self-releasing under load reversal.
Key Features
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Concentric 360° Locking Collar
Uniform shaft contact around the full bore circumference. No eccentricity — no imbalance force at any operating speed. Safe for high-speed and precision applications.
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Fully Bidirectional
Concentric collar releases symmetrically in both directions. Suitable for reversing drives, oscillating shafts, and jogging operations that would release an eccentric collar.
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Wider Inner Ring Insert
UC series wide inner ring accommodates axial shaft float. Self-aligning spherical OD corrects up to 2° misalignment between shaft and mounting plane.
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Same Housing Footprint as UCP200
H, L, J, A dimensions identical to equivalent UCP200 bore sizes. Direct retrofit for upgrade to concentric locking without machine modification.
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Accessible Lubrication
Grease fitting at 45° standard. 90° position available on request. Insert pre-lubricated at factory.
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Metric and Inch Bore
Bore range 20–60 mm with inch variants within each housing size.
Full Dimensional Specifications
| Unit No. | d mm | d inch | H mm | L mm | J mm | A mm | N mm | N1 mm | H1 mm | H0 mm | B1 mm | S mm | Bolt | kg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UEP204 / 204-12 | 20 | 3/4 | 33.3 | 127 | 95 | 38 | 13 | 19 | 14 | 64 | 33 | 12.7 | M10 | 0.68 |
| UEP205 / 205-14/15/16 | 25 | 7/8~1 | 36.5 | 140 | 105 | 38 | 13 | 19 | 15 | 71 | 35.4 | 14.3 | M10 | 0.86 |
| UEP206 / 206-17/18/19/20 | 30 | 1-1/16~1-1/4 | 42.9 | 160 | 121 | 44 | 17 | 21 | 16 | 82 | 39.8 | 15.9 | M14 | 1.20 |
| UEP207 / 207-20/21/22/23 | 35 | 1-1/4~1-7/16 | 47.6 | 167 | 126 | 48 | 17 | 21 | 17 | 92 | 43.9 | 17.5 | M14 | 1.60 |
| UEP208 / 208-24/25 | 40 | 1-1/2, 1-9/16 | 49.2 | 180 | 137 | 52 | 17 | 21 | 18 | 99 | 50.2 | 19 | M14 | 2.00 |
| UEP209 / 209-26/27/28 | 45 | 1-5/8~1-3/4 | 54 | 190 | 146 | 54 | 17 | 21 | 20 | 106 | 50.2 | 19 | M14 | 2.32 |
| UEP210 / 210-30/31/32 | 50 | 1-7/8~2 | 57.2 | 206 | 159 | 60 | 20 | 25 | 21 | 114 | 52.6 | 19 | M16 | 2.91 |
| UEP211 / 211-32/34/35 | 55 | 2~2-3/16 | 63.5 | 217 | 172 | 60 | 20 | 25 | 23 | 125 | 56.6 | 22.2 | M16 | 3.65 |
| UEP212 / 212-36/38/39 | 60 | 2-1/4~2-7/16 | 69.9 | 238 | 186 | 70 | 20 | 25 | 24 | 137 | 66.6 | 25.4 | M16 | 4.87 |
→ Scroll table horizontally to view all columns. Catalogue dimensions for reference only — engineering drawings required before order.
Applications
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Textile & Winding Machinery
Ring frame spindle supports, winding mandrel bearings, and draw-roll shaft supports where shaft speeds exceed 1500 rpm and balance is critical.
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High-Speed Fan Drives
Centrifugal and mixed-flow fan shafts in HVAC, industrial ventilation, and process air systems where imbalance-induced vibration would be transmitted to ductwork or structure.
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Centrifuge & Separator Shafts
Basket centrifuge drive shafts and disc separator spindles requiring consistent dynamic balance across the full operating speed range.
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Reversing Conveyors & Indexing Drives
Belt reversers, shuttle conveyors, and servo-indexed drives where the shaft changes direction under load.
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Agricultural Precision Seeding Equipment
Variable-speed metering roller shafts on pneumatic seeders where rotation reverses during calibration and blockage clearing.
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Mining Conveyor Head Pulleys
Head pulley shafts on underground coal conveyor systems where periodic reversal for belt tracking adjustment demands a bidirectional locking collar.
📦 MOQ & Order Information
- Standard parts: quantity-based MOQ applies per model number.
- High-value / large items: minimum order by USD order value.
- New-client samples: 1–5 pcs available at sample price for first-time buyers.
- Multi-model combines: aggregate orders of USD 1,500 or more across models accepted.
- Special materials / processes: subject to process MOQ — confirm at inquiry stage.
- Retail (1–2 pcs): not accepted. Minimum sample order is 1–5 pcs at sample pricing.
Detailed engineering drawings must be submitted and approved before order confirmation. Catalogue dimensions are for reference only.
Installation Notes
Slide the unit onto the shaft to position. Thread the locking collar nut finger-tight by hand. Using the supplied spanner or hook wrench, tighten the collar nut in the direction that draws the taper inward — confirm direction against the engineering drawing. The concentric collar does not require rotation in the shaft direction before tightening, unlike the eccentric collar of the NAP200 series. Re-check collar nut torque after first 8 hours at full load.
Frequently Asked Questions
Can UEP200 be used on a reversing drive?
Yes. The concentric collar releases symmetrically in both directions — suited to bidirectional operation at elevated speeds.
How does UEP200 differ from NAP200?
NAP200 eccentric collar is unidirectional. UEP200 concentric collar maintains clamping force in both directions and adds no imbalance mass.
Is the housing interchangeable with UCP200?
Yes for H, L, J, A. Verify axial clearance for the B1 collar nut extension before retrofitting.
What is the MOQ?
Standard parts: quantity-based MOQ. Samples 1–5 pcs at sample price. Multi-model from USD 1,500. Retail 1–2 pcs not accepted.
Request a Quote for UEP200 Series
Provide shaft diameter, operating speed (rpm), rotation direction, and daily running hours. Contact us.
