UCP218-56 Pillow Block Bearing 3-1/2" (101.6mm) Bore | Cast Iron Housing | Cr=96,100N | Self-Aligning | Double Sealed | Set Screw Locking

The UCP218-56 is a standard duty Cast Iron Pillow Block Bearing Unit from the UCP200 series, designed for a 3-1/2 inch (101.6mm) bore shaft. It combines a robust cast iron housing with an anti-rotation device, self-alignment capability (typically ±2–3°), and a UC218-56 chrome steel insert bearing featuring a slinger double-seal design and two set screw shaft locking mechanism.

With a dynamic load rating of Cr = 96,100 N (21,600 lbf) and static load rating of Co = 71,500–75,500 N (16,074–16,100 lbf) — confirmed across Timken, VXB, Motion, and Tritan sources — the UCP218-56 delivers reliable radial load capacity for heavy-duty 3-1/2" shaft applications.

The standard grease fitting (Zerk fitting) allows for in-service relubrication without disassembly, extending service life in demanding industrial environments. The cast iron housing provides excellent rigidity and vibration damping, while the self-aligning design compensates for shaft misalignment.

Product Specifications

Key Features & Engineering Advantages

• ✅ 3-1/2" (101.6mm) Bore — Large Shaft Capacity — Designed for heavy 3.5-inch shafts common in agricultural, industrial, and construction machinery; one of the largest standard bore sizes in the UCP200 series

• ✅ Cr=96,100N / Co=71,500–75,500N (Multi-Source Confirmed) — Robust load capacity confirmed across Timken, VXB, Motion, and Tritan independent sources, ensuring reliable performance in heavy radial load applications

• ✅ Cast Iron Housing with Anti-Rotation Device — Rigid cast iron housing provides excellent vibration damping and structural integrity; anti-rotation pin prevents insert bearing from rotating within housing under shock loads

• ✅ Self-Aligning Design — Compensates for shaft misalignment (angular misalignment ±2–3°), reducing bearing stress and extending service life in imperfectly aligned shaft installations

• ✅ Double Sealed + Slinger Seal — Triple-layer sealing system (double contact seals + slinger) provides superior protection against dust, dirt, moisture, and contaminants in harsh outdoor and industrial environments

• ✅ Two Set Screw Locking — Dual set screws positioned in the wide inner ring provide positive shaft locking and prevent axial displacement under heavy loads and vibration

• ✅ Standard Grease Fitting (Zerk) — Allows convenient in-service relubrication without disassembly, critical for extended maintenance intervals in remote or hard-to-access installations

• ✅ Wide Inner Ring (Bi=96mm / 3.78 in) — Extended inner ring width provides greater shaft contact area, improving set screw grip and reducing shaft fretting

• ✅ Standard Base-to-Center Height — Standard h=4 in (101.6mm) base-to-center height ensures direct drop-in compatibility with existing UCP218-56 installations from any brand

• ✅ Full Global Interchangeability — Directly interchangeable with Timken UCP218-56, SKF SYJ 3.1/2 TF, FAG, NSK, NTN equivalents — same mounting dimensions, same bolt pattern

• ✅ UCP200 Series Standard — Part of the globally standardized UCP200 series, ensuring universal availability of replacement parts and housings worldwide

• ✅ GCr15 / 52100 Chrome Steel Insert — Premium chrome steel insert bearing with HRC 60–64 hardness for exceptional wear resistance and fatigue life

Typical Applications

Based on the UCP218-56's 3-1/2" bore, 96,100N dynamic load rating, double-sealed cast iron housing, and self-aligning design:

Cross Reference / Interchange

Series Context — UCP218-56 within the UCP200 Pillow Block Series

Key Series Insights:The UCP218-56 uses the "-56" suffix to denote the 3-1/2 inch (56/16 = 3.5") bore in the inch-series UCP200 designation systemWith Cr=96,100N and bolt size 7/8 in, the UCP218-56 is among the heaviest-duty standard UCP200 series units, bridging standard and extra-heavy duty applicationsThe 101.6mm bore is shared with the metric UCP218 (also 90mm bore in pure metric), making it critical to specify the "-56" suffix when ordering the inch-bore versionAll UCP200 series units share the same cast iron housing design, set screw locking, self-aligning insert bearing, and grease fitting — ensuring consistent maintenance procedures across the entire series

Export & Logistics Notes for UCP218-56

• Standard Export Packaging — Individual box + outer carton or custom packaging; heavy units individually wrapped for protection

• Fast Delivery — Standard orders: 3–7 days from stock; DHL/FedEx/UPS express available (VIP member rates ~15% savings)

• 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

• Technical Support — 24-hour online technical support for installation, lubrication, and application engineering

• Global Network — Offices/agents in 30+ countries and regions

Why Choose NEXANS Bearing for UCP218-56?

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 across agricultural, industrial, construction, and conveyor sectors.

• Factory-Direct Pricing — No middlemen, competitive wholesale rates

• Large Ready Stock — 20,000+ bearing models in inventory, including full UCP200 series

• 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

• Global Network — Offices/agents in 30+ countries and regions

• 24/7 Technical Support — Expert application engineering support for shaft fit, lubrication, and mounting recommendations

Get a Quote Now

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.