UCPW200 Series Tapped Base Pillow Block Bearing Units — W-Type Dual-Side Tapped Base
The UCPW200 introduces a tapped base variant where the threaded mounting holes are positioned on both sides of the housing centreline — the W designation referring to this bilateral hole arrangement. This configuration allows the mounting bolt pattern to match frame designs where the bolt positions are set outside the housing centreline — common in structural steel fabrications, rail-mounted systems, and equipment originally designed for inch-dimension bolt grids. UCPW200's compact M8 thread at 50.8 mm (exactly 2 inch) bolt spacing makes it a direct match for legacy imperial frame designs without adapters.
W-Type Hole Pattern — Configuration and Application Logic
On the UCPW201–204 (12–20 mm bore), the tapped holes are M8 threads in a 50.8 mm bolt spacing (J dimension) — dimensions that correspond to widely used inch-standard mounting grids at 2-inch centres. For larger bore sizes from UCPW205 upward, the thread steps to M10 and M12, and the hole spacing increases proportionally. The result is a tapped base pillow block that integrates cleanly with both legacy metric and legacy inch-standard machine frames across the 12–50 mm shaft range.
Key Features
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W-Type Bilateral Tapped Holes
Threaded holes positioned on both sides of the housing centreline, offset toward the flanges. Matches structural frame bolt grids where hole positions fall outside the housing body centreline.
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Compact Thread Sizes from M8
UCPW201–204 uses M8 tapped holes at 50.8 mm spacing — matching 2-inch centre imperial bolt grids without adapters.
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Setscrew Locking Insert
Standard dual setscrew retention at 120°. Same insert bearing and maintenance procedure as UCP200. Bidirectional and intermittent-duty capable.
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Wide Inner Ring Self-Aligning Insert
UC series wide inner ring. Spherical OD compensates shaft-to-housing angular misalignment. Wide inner ring provides setscrew seating surfaces and axial float.
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Low-Profile Housing
UCPW housing has a lower overall height than UCPA200 in some bore ranges.
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Drop-In for UCPW-Pattern Frames
GB, ISO, ANSI, JIS dimensional compliance. Direct replacement for UCPW-style tapped base units in existing machine frames.
Full Dimensional Specifications
| Unit No. | d mm | d inch | H mm | L mm | J mm | A mm | M | G mm | H0 mm | H1 mm | B mm | S mm | Bolt | kg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UCPW201 / 201-8 | 12 | 1/2 | 33.3 | 65 | 50.8 | 32 | M8 | 13 | 64 | 13 | 31 | 12.7 | M8 | 0.80 |
| UCPW202 / 202-9/10 | 15 | 9/16~5/8 | 33.3 | 65 | 50.8 | 32 | M8 | 13 | 64 | 13 | 31 | 12.7 | M8 | 0.79 |
| UCPW203 / 203-11 | 17 | 11/16 | 33.3 | 65 | 50.8 | 32 | M8 | 13 | 64 | 13 | 31 | 12.7 | M8 | 0.77 |
| UCPW204 / 204-12 | 20 | 3/4 | 33.3 | 65 | 50.8 | 32 | M8 | 13 | 64 | 13 | 31 | 12.7 | M8 | 0.76 |
| UCPW205 / 205-14/15/16 | 25 | 7/8~1 | 36.5 | 70 | 50.8 | 36 | M10 | 13 | 70 | 13 | 34.1 | 14.3 | M10 | 0.91 |
| UCPW206 / 206-17~20 | 30 | 1-1/16~1-1/4 | 42.9 | 98 | 76.2 | 38 | M10 | 16 | 82 | 15 | 38.1 | 15.9 | M10 | 1.42 |
| UCPW207 / 207-20~23 | 35 | 1-1/4~1-7/16 | 47.6 | 103 | 82.6 | 45 | M10 | 19 | 93 | 15 | 42.9 | 17.5 | M10 | 1.91 |
| UCPW208 / 208-24/25 | 40 | 1-1/2~1-9/16 | 49.2 | 116 | 88.9 | 48 | M12 | 19 | 99 | 15 | 49.2 | 19 | M12 | 2.28 |
| UCPW209 / 209-26~28 | 45 | 1-5/8~1-3/4 | 53.9 | 120 | 95.3 | 48 | M12 | 19 | 107 | 18 | 49.2 | 19 | M12 | 2.61 |
| UCPW210 / 210-30~32 | 50 | 1-7/8~2 | 57.2 | 135 | 101.6 | 54 | M16 | 22 | 115 | 18 | 51.6 | 19 | M16 | 3.28 |
→ Scroll table horizontally to view all columns. Catalogue dimensions for reference only — engineering drawings required before order.
M = tapped thread in housing base. G = tapped thread depth (mm). J = bolt hole spacing. UCPW201–204: M8 at 50.8 mm spacing matches 2-inch imperial bolt grid.
Applications
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Legacy Imperial-Frame Machinery
Bearing replacements in machines originally built to inch-standard frame designs where the 2-inch bolt grid at UCPW201–204 is a direct match.
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Structural Steel Fabrications
Bearing supports mounted on standard structural steel sections where bolt positions fall outside the housing centreline.
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Light Industrial Conveyor Builds
Small conveyor frame builds in light gauge steel where M8 mounting bolts are standard and the lighter UCPW tapped hole size matches the frame capacity.
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Compact Agricultural Implement Frames
Bearing positions on light implement frames where the frame rail bolt pattern uses 2-inch or similar imperial spacing.
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Small Fan & Blower Unit Frames
Fan unit housing frames in compact ventilation equipment where the structural frame uses light gauge steel with M8 bolt holes and shaft diameters are 12–25 mm.
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Tabletop Machine Bases
Bearing positions in small machine tool bases where the base plate bolt pattern falls outside the housing centreline.
📦 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.
UCPW200 vs UCPG200 vs UCPA200 — Tapped Base Selection
All three series use tapped base housing, but the hole pattern and position differ. UCPA200 has holes centred under the housing body — standard tapped base. UCPW200 has holes offset toward the flanges (W-type) with compact M8/M10/M12 thread sizes — for imperial-grid and light structural frames. UCPG200 uses a G-type hole pattern with different offset geometry. If the mounting frame bolt positions are unknown, measure the existing bearing housing hole pattern and match against the J and A dimensions in the specification table for each series.
Frequently Asked Questions
What is the W designation?
W = bilateral tapped holes offset toward housing flanges, not centred under the body as in UCPA200.
Why M8 for UCPW201–204?
M8 at 50.8 mm spacing matches 2-inch imperial bolt grids — no adapters needed for legacy imperial frames.
Interchangeable with UCPA200?
Only if frame bolt positions match UCPW J and A dimensions — hole offset differs. Measure first.
What is the MOQ?
Standard parts: quantity-based MOQ. Samples 1–5 pcs. Multi-model from USD 1,500. Retail 1–2 pcs not accepted.
Request a Quote for UCPW200 Series
Provide shaft diameter, existing frame bolt hole spacing (J dimension), thread size, and bore type. Contact us.
