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Product Description
The UCP208-40MM is a standard duty Cast Iron Pillow Block Bearing Unit from the UCP200 series, designed for a 40mm metric bore shaft — the "-40MM" suffix explicitly denoting the metric bore size to distinguish it from the UCP208-25 (1-9/16"/39.688mm inch bore). It is the metric counterpart to the UCP208-25 and represents the standard 40mm ISO/DIN metric bore in the UCP208 series. Critically, it is the immediate predecessor to the UCP209-26 (1-5/8") in the NEXANS catalog, placing it at the UCP208→UCP209 series boundary — the most significant load capacity step in the UCP200 inch/metric series.
With a dynamic load rating of Cr ≈ 29.1 kN confirmed independently by both FYH/VXB (29.1 kN) and Koyo/JTEKT official page (29.1 kN) — perfect agreement between two independent Japanese premium bearing brands — and static load rating of Cor ≈ 17.8 kN per FYH, the UCP208-40MM delivers reliable radial load capacity for 40mm metric shaft applications. The limiting speed of ≈4,000 r/min is higher than the UCP209 series (3,600–3,700 rpm) and significantly higher than the UCP210 series (3,300–3,400 rpm), reflecting the smaller bore and lighter rotating mass of the UC208 insert bearing.
Complete dimensional data from NEXANS official page achieves triple-source confirmation for three key parameters: overall length 184mm (NEXANS ✅, Bearings Direct ✅, Koyo ✅), base-to-center height 49.2mm (NEXANS ✅, Bearings Direct ✅, Koyo ✅), bolt hole spacing 137.3mm (NEXANS) / 137mm (Bearings Direct ✅, PTI ✅) — all within 0.2% agreement. Weight is ≈2.18 kg (4.800 lbs) per PTI/MRO Supply — the lightest unit in the UCP208–UCP210 metric series covered in this catalog.
Nearly identical bore sizes, completely different insert bearings, non-interchangeable shafts:
Parameter | UCP208-40MM | UCP208-25 (prev catalog) |
Bore | 40.000mm (metric) | 39.688mm (1-9/16" inch) |
Bore Difference | — | −0.312mm smaller |
Housing Series | UCP208 | UCP208 |
Insert Bearing | UC208-40MM | UC208-25 |
All Housing Dims | Identical | Identical |
Dynamic Load (Cr) | ≈29.1 kN | ≈29.1 kN (same series) |
Shaft Type | 40mm metric ONLY | 1-9/16" inch ONLY |
Bore Difference | — | −0.312mm |
⚠️ A UCP208-40MM installed on a 39.688mm (1-9/16") shaft will have 0.312mm radial clearance — causing fretting, shaft damage, and immediate bearing failure. Always confirm shaft diameter unit (metric vs inch) before ordering.
The NEXANS catalog confirms UCP208-40MM immediately precedes UCP209-26 — the most significant series step in the UCP200 metric catalog:
Parameter | UCP208-40MM (this product) | UCP209-26 (next series) |
Bore | 40mm metric | 1-5/8" (41.275mm) inch |
Series | UCP208 | UCP209 |
Overall Length (a) | 184 mm | 190 mm (+3.3%) |
Bolt Hole Spacing (e) | 137.3 mm | 146.1 mm (+6.4%) |
Center Height (h) | 49.2 mm | 54.0 mm (+9.8%) |
Total Width (w) | 100 mm | 106.4 mm (+6.4%) |
g Dimension | 18 mm | 20 mm (+11.1%) |
Bolt Size | M14 / 1/2" | M14 / 1/2" (same) |
Dynamic Load (Cr) | ≈29.1 kN | ≈31.9–34.1 kN (+9.6–17.2%) |
Static Load (Cor) | ≈17.8 kN | ≈21.3 kN (+19.7%) |
Limiting Speed | ≈4,000 rpm | ≈3,700 rpm (−7.5%) |
Weight | ≈2.18 kg | ≈2.28–2.43 kg (+4.6–11.5%) |
Housing Compatible | NOT compatible | NOT compatible |
✅ Key takeaway: The UCP208→UCP209 series step brings a 9.6–17.2% Cr increase and 19.7% Cor increase at the cost of a larger housing (+3–10% in all dimensions) and lower limiting speed (−7.5%). Notably, bolt size remains M14/1/2" across this boundary — unlike the UCP209→UCP210 boundary where bolt size jumps to M16/5/8". The UCP208-40MM is the correct choice when load requirements are ≤29.1kN and maximum speed (≈4,000rpm) or minimum footprint is the priority.
Parameter | Inch | Metric |
Model | UCP208-40MM | UCP208-40MM |
Insert Bearing | UC208-40MM | UC208-40MM |
Shaft Diameter (Bore) | ≈1.5748 in | 40.000 mm |
Base to Center Height (h) | 1-15/16 in (1.937") | 49.2 mm |
Overall Length (a) | 7-1/4 in (7.250") | 184 mm |
Bolt Hole Spacing (e) | 5-13/32 in (5.406") | 137.3 mm |
Housing Base Width (b) | 2-1/8 in (2.125") | 53.9 mm |
Bolt Hole Dia (S2) | 25/32 in (0.781") | 20 mm |
Bolt Hole Dia (S1) | 43/64 in (0.672") | 17 mm |
g Dimension | 45/64 in (0.703") | 18 mm |
Total Width (w) | 3-15/16 in (3.9375") | 100 mm |
Insert Bearing Width (Bi) | 1.9370 in | 49.2 mm |
n Dimension | 0.7480 in | 19 mm |
Bolt Size | 1/2 in | M14 |
Dynamic Load Rating (Cr) | ≈6,541 lbf | ≈29.1 kN |
Static Load Rating (Cor) | ≈4,001 lbf | ≈17.8 kN |
Limiting Speed | ≈4,000 RPM | ≈4,000 r/min |
Weight | 4.800 lbs | ≈2.18 kg |
Bore Type | Cylindrical | 圆柱孔 |
Housing Material | Cast Iron (Ribbed Base) | 铸铁（带肋底座） |
Insert Bearing Material | AISI 52100 / GCr15 Chrome Steel | GCr15 铬钢 |
Locking Method | Two Set Screws | 双顶丝 |
Seal Type | Double Sealed + Slinger Seal (Both Sides) | 双密封 + Slinger（两侧） |
Self-Aligning | ✅ Yes | ✅ 是 |
Grease Fitting | ✅ Yes (Zerk) | ✅ 标配 |
Anti-Rotation Device | ✅ Yes | ✅ 是 |
Inner Ring Type | Wide Inner Ring (Extended Both Sides) | 宽内圈（两侧延伸） |
Relubricatable | ✅ Yes | ✅ 是 |
✅ 40mm Metric Bore — Standard ISO/DIN Shaft Size, UCP208 Series Metric Entry — The 40mm bore is a universally standard metric shaft size per ISO/DIN; the "-40MM" suffix explicitly identifies the metric bore to prevent confusion with UCP208-25 (1-9/16"/39.688mm inch bore, 0.312mm smaller)
✅ Cr≈29.1kN — Perfect Dual Japanese Brand Agreement (FYH + Koyo/JTEKT) — FYH/VXB (29.1kN) and Koyo/JTEKT official page (29.1kN) confirm Cr with 0.0% variance — the strongest possible dual-source confirmation, representing two of Japan's most respected bearing manufacturers independently validating the same load rating
✅ ≈4,000 rpm — Highest Speed in UCP208–UCP210 Metric Series — At ≈4,000 rpm, the UCP208-40MM achieves the highest limiting speed among all UCP208–UCP210 metric variants in this catalog — ideal for high-speed 40mm shaft applications where UCP209/UCP210 series speed limits (3,600–3,700 rpm) are insufficient
✅ Lightest Unit in UCP208–UCP210 Metric Series — 2.18kg (PTI Confirmed) — At 4.800 lbs (≈2.18kg) per PTI/MRO Supply, the UCP208-40MM is the lightest unit in the UCP208–UCP210 metric series — 4.4% lighter than UCP209-45MM (2.28kg) and up to 20.6% lighter than UCP210-50MM (2.6–2.77kg)
✅ Triple-Source Dimensional Confirmation (NEXANS × Bearings Direct × Koyo) — Three independent sources confirm overall length (184mm), base-to-center height (49.2mm), and bolt hole spacing (137–137.3mm) within 0.2% — the highest dimensional data confidence in the UCP208 metric series
✅ M14/1/2" Bolt — Same as UCP209 Series — Unlike the UCP209→UCP210 boundary (where bolt size jumps from M14 to M16), the UCP208→UCP209 boundary maintains the same M14/1/2" bolt size — simplifying hardware procurement for facilities using both UCP208 and UCP209 series units
✅ Compact Housing — 100mm Total Width vs 106.4mm (UCP209) — The UCP208-40MM's 100mm total width is 6.4% narrower than the UCP209 series (106.4mm), making it ideal for space-constrained installations requiring a 40mm metric bore
✅ Koyo/JTEKT Official Confirmation — Premium Japanese Brand Validation — Koyo (JTEKT Corporation) is one of the world's top 5 bearing manufacturers; their official product page independently confirms d=40mm, H=49.2mm, L=184mm, Cr=29.1kN — providing the highest-tier brand validation for the UCP208-40MM
✅ Self-Aligning Design (±2–3°) — Compensates for shaft misalignment, reducing bearing stress and extending service life in imperfectly aligned shaft installations
✅ Double Sealed + Slinger Seal (Both Sides) — Triple-layer sealing system provides superior protection against dust, dirt, moisture, and contaminants in harsh outdoor and industrial environments
✅ Cast Iron Housing with Anti-Rotation Device — Anti-rotation pin prevents insert bearing rotation within housing under shock loads; robust cast iron provides excellent vibration damping
✅ AISI 52100 / GCr15 Chrome Steel Insert — Premium chrome steel insert bearing with HRC 60–64 hardness for exceptional wear resistance and fatigue life
Industry | Application |
Agriculture | Grain auger drives, combine harvester shafts, irrigation pump drives, PTO assemblies, feed mill conveyors |
Conveyor Systems | Belt conveyor head/tail pulleys, screw conveyor drives, bucket elevator shafts |
Fan & Blower | Industrial fan shaft supports, HVAC blower assemblies, cooling tower fan drives — highest-speed advantage in UCP208–UCP210 metric series |
Pump Systems | Agricultural irrigation pumps, industrial centrifugal pump shaft supports |
Automotive | Automotive assembly line conveyors, parts handling equipment |
Construction Machinery | Concrete mixer drum shafts, aggregate conveyor drives, material handling equipment |
Manufacturing | Production line conveyor shafts, packaging machinery drives, textile mill rolls |
Material Handling | Warehouse conveyor systems, sorting equipment, palletizer drives |
Food Processing | Grain handling equipment, flour mill machinery, food conveyor systems |
Farm Machinery | PTO shaft supports, harvester drives, planter shaft assemblies |
HVAC | Fan shaft supports, blower assemblies, air handling unit drives |
Feed Mill | Auger drives, mixer shaft supports, pellet mill conveyor systems |
Sporting & Consumer Goods | Fitness equipment drives, recreational machinery shaft supports |
General Industrial | Any 40mm metric shaft requiring compact, lightweight, high-speed housed bearing support |
Brand | Part Number | Source |
NEXANS / NKS | UCP208-40MM | |
FYH | UCP208 (40mm) | |
Koyo / JTEKT | UCP208 (40mm) | |
PTI | UCP208-40MM | |
SKF | UCP 208 (40mm) | |
PEER | UCP208-40MM | |
BROWNING | VPS-208-40MM | |
AMI / ASAHI | UCP208-40MM | |
NTN | UCP208D1 (40mm) | |
DODGE | P2B-SC-40MM | |
LINK-BELT | P3-U208N-40MM | |
Insert Bearing | UC208-40MM (all brands) | |
Material Equivalent | 52100 (AISI) / 100Cr16 (DIN) / SUJ2 (JIS) / GCr15 (GB) |
Model | Bore | Series | Cr | Cor | Speed | Weight | Bolt | Length |
UCP208-25 (prev) | 1-9/16" (39.688mm) inch | UCP208 | ≈29.1 kN | ≈17.8 kN | ≈4,000 rpm | ≈2.18 kg | M14 | 184 mm |
UCP208-40MM | 40mm metric | UCP208 | ≈29.1 kN | ≈17.8 kN | ≈4,000 rpm | ≈2.18 kg | M14 | 184 mm |
UCP209-26 (next) | 1-5/8" (41.275mm) inch | UCP209 | ≈31.9–34.1 kN | ≈21.3 kN | ≈3,700 rpm | ≈2.28–2.43 kg | M14 | 190 mm |
UCP209-27 | 1-11/16" (42.863mm) inch | UCP209 | ≈31.9 kN | ≈20.8 kN | ≈3,700 rpm | ≈2.28–2.43 kg | M14 | 190 mm |
UCP209-45MM | 45mm metric | UCP209 | ≈32.5 kN | ≈20.4 kN | ≈3,600 rpm | ≈2.28 kg | M14 | 190 mm |
UCP210-50MM | 50mm metric | UCP210 | ≈35.0–35.1 kN | ≈23.7 kN | ≈3,400 rpm | ≈2.6–2.77 kg | M12 | 206 mm |
Key Insights — UCP208-40MM position in series: Highest speed in UCP208–UCP210 metric catalog — At ≈4,000 rpm, the UCP208-40MM leads all metric variants in the UCP208–UCP210 range; the next fastest is UCP209-45MM at 3,600 rpm — a 11.1% speed advantage Lightest in UCP208–UCP210 metric catalog — At ≈2.18kg, the UCP208-40MM is the lightest metric unit in the range — ideal for weight-sensitive installations Bolt size continuity across UCP208→UCP209 boundary — Unlike the UCP209→UCP210 boundary (M14→M16 bolt change), the UCP208→UCP209 boundary maintains M14/1/2" bolts — a key advantage for facilities standardizing on M14 hardware Perfect FYH + Koyo Cr agreement — The 0.0% variance between FYH (29.1kN) and Koyo (29.1kN) for Cr represents the strongest possible independent brand validation in this catalog series No interchange list on NEXANS page — Unlike UCP209-2x series (which list 10–11 interchange brands), the NEXANS UCP208-40MM page does not include an interchange list; cross-references above are derived from FYH, Koyo, PTI, and Bearings Direct sources
Standard Export Packaging — Individual box + outer carton or custom packaging; ≈2.18kg units individually wrapped for protection
Fast Delivery — Standard orders: 3–7 days from stock; DHL/FedEx/UPS express available
Global Shipping — LCL/FCL ocean freight, air freight, express courier — all options available
Full Export Documentation — Certificate of Origin (CO), material certificates, quality inspection reports, packing lists
OEM / Private Label — Custom branding & packaging available for distributors and OEM customers
Global Network — Offices/agents in 30+ countries and regions
Since 1997, Liaocheng Nexans Bearing Co., Ltd has been a trusted factory-direct manufacturer and global supplier of pillow block bearings and housed bearing units.
Factory-Direct Pricing — No middlemen, competitive wholesale rates
Large Ready Stock — 20,000+ bearing models in inventory, full UCP200 series in both inch and metric bore variants
Flexible MOQ — Single-unit replacement orders to bulk OEM contracts
OEM / Private Label — Custom branding & packaging available
Full Export Documentation — CO, quality certificates, professional export packaging
24/7 Technical Support — Expert application engineering support including UCP208 metric vs inch bore selection (40mm vs 1-9/16"), UCP208 vs UCP209 series selection, and mounting compatibility guidance
Email: export@nksbearing.com WhatsApp: +86-15562839480 Website: www.nksbearing.com
NEXANS Bearing — Your trusted factory-direct partner for pillow block bearings and housed bearing units since 1997.
