351068 Double Row Tapered Roller Bearing 340×520×180mm | Heavy-Duty 340mm Bore Bearing for Mining, Rolling Mill & Paper-Making Industry | Cross Ref: 97168

The 351068 (cross-referenced as 97168) is a heavy-duty double row tapered roller bearing with dimensions of 340×520×180mm, weighing 119kg. This large-format bearing is engineered to operate reliably under conditions that would destroy conventional single-row bearing solutions — delivering high combined radial and axial load capacity in a robust double-row configuration built for the world's most demanding heavy machinery environments including mining, metallurgy, paper-making, and heavy industrial gearboxes.

The 351068 is a well-established bearing in the GOST/GB 3510 heavy double row tapered roller series, cross-referenced under both 351068 (new GB standard designation) and 97168 (legacy old-model designation). Both references refer to the identical 340×520×180mm, 119kg bearing. This dual-designation coverage ensures seamless compatibility with global OEM, MRO, and aftermarket procurement and maintenance systems across Russia, CIS, China, and international industrial markets.

Manufactured from GCr15 / 52100 chrome steel to ABEC and DIN620 precision standards, and supplied factory-direct by NEXANS Bearing from Liaocheng, Shandong, this bearing is available in open, sealed, or shielded configurations with full OEM customization for global industrial buyers.

Product Specifications

Specifications verified across multiple international bearing databases and supplier sources.

Key Features & Engineering Advantages

• ✅ 119kg Heavy-Duty Construction — At 119kg, the 351068 is engineered for the most extreme industrial shaft applications in the 340mm bore class — its mass reflects the scale of rolling element and raceway material required to sustain extreme continuous combined loads

• ✅ Extreme Combined Load Capacity — Double row tapered geometry simultaneously handles heavy radial and bidirectional axial (thrust) loads — the defining requirement for heavy mining shafts, rolling mill roll necks, and large industrial gearbox main shafts

• ✅ Paper-Making Industry Proven — The 351068 is a well-established bearing in paper-making industry drive systems, where extreme combined loads, moisture contamination, and continuous high-duty-cycle operation are standard operating conditions

• ✅ Multiple Seal & Shield Options — Available in open, shielded, and sealed configurations to match diverse contamination protection requirements — from clean industrial gearboxes to wet, dusty, or chemically aggressive paper-making and mining environments

• ✅ High Stiffness & Shaft Rigidity — The double row configuration delivers superior shaft stiffness compared to single-row designs, reducing deflection and improving precision in heavy rotating machinery — critical for rolling mill roll neck and precision gearbox applications

• ✅ Severe Misalignment Tolerance — Engineered to maintain full performance under significant shaft misalignment conditions, reducing sensitivity to installation errors and structural deflection in heavy machinery frames and mill housings

• ✅ Shock & Vibration Resistance — Purpose-built to absorb heavy impact loads and continuous vibration — critical for mining crushers, paper mill drives, and heavy-duty industrial machinery where shock loading is a constant operational reality

• ✅ Dual Cross-Reference Compatibility — Referenced as both 351068 (new GB standard) and 97168 (old model designation), compatible with multiple OEM and aftermarket part numbering systems for seamless global sourcing and maintenance replacement

• ✅ Multiple Precision Grades — Available in P0, P6, P5, and P4 precision grades, enabling precise specification matching for diverse heavy industrial applications from standard industrial drives to precision rolling mill and gearbox applications

• ✅ GCr15 Chrome Steel Construction — Manufactured from high-grade GCr15 / AISI 52100 chrome steel for exceptional hardness (HRC 60–65), superior wear resistance, and outstanding rolling contact fatigue life under sustained extreme loads

Application Scenarios

The 351068 double row tapered roller bearing is engineered for the world's most demanding heavy industrial environments:

• Paper-Making Industry — Drive shaft and roll bearings in large paper-making machines where extreme combined loads, moisture, chemical contamination, and continuous high-duty-cycle operation demand maximum reliability and contamination resistance

• Heavy Mining Machinery — Main shaft bearings for large mining crushers, grinding mills, and tunnel boring machines where extreme combined loads, shock, and contamination are constant operational conditions

• Steel & Metal Rolling Mills — Roll neck bearings in hot and cold rolling mill stands for steel, aluminum, copper, and other metal production lines requiring maximum radial and axial load capacity

• Heavy Industrial Gearboxes — Main shaft and intermediate shaft bearings in large-scale industrial gearboxes for power generation, cement production, and heavy process industries

• Hoisting & Lifting Equipment — Large crane and hoist drum shaft bearings where bidirectional axial loads and heavy radial loads are simultaneously present

• Metallurgical & Process Industry — Continuous casting machine bearings, large rotary kiln drives, and heavy-duty conveyor and mill drive shaft assemblies

351068 Series Context — Full Heavy Series Comparison

For buyers evaluating the complete NEXANS heavy double row tapered roller bearing range in the 340–600mm bore class:

All models available factory-direct from NEXANS Bearing with full OEM customization, multiple clearance grades, and precision grades to order.

Clearance & Precision Grade Selection Guide

Selecting the correct clearance and precision grade for the 351068 is critical for optimal bearing performance and service life:

Contact NEXANS Bearing technical team via WhatsApp (+86-15562839480) for application-specific grade recommendations.

FAQ — 351068 Bearing & OEM Services

Q1: What are the key specifications of the 351068 bearing?

The 351068 is a double row tapered roller bearing with dimensions 340×520×180mm, weighing 119kg. It is cross-referenced as 97168 under the legacy old-model designation system. Available in open, shielded, and sealed configurations with precision grades P0/P6/P5/P4 and clearance grades C0 through C5.

Q2: What are the cross-reference designations for the 351068 bearing?

The 351068 bearing is cross-referenced under two designations: 351068 (new model / Chinese GB standard) and 97168 (old model designation). Both refer to the identical 340×520×180mm, 119kg double row tapered roller bearing. NEXANS Bearing supplies full documentation under either reference number to match your procurement and maintenance system requirements.

Q3: What industries specifically use the 351068 bearing?

The 351068 is particularly well-established in paper-making industry drive systems, as well as heavy mining machinery, steel rolling mills, large industrial gearboxes, hoisting equipment, and metallurgical process industry machinery. Its 340mm bore, 119kg weight, and double row tapered geometry make it suitable for any application requiring extreme combined radial and bidirectional axial load capacity in the 340mm bore class.

Q4: How does the 351068 compare to the adjacent 351072 model?

The 351068 (340×520×180mm, 119kg) is the immediately smaller model compared to the 351072 (360×540×185mm, 120kg). The 351068 is only 1kg lighter with a 20mm smaller bore and 5mm narrower width — making it the correct and most efficient choice for 340mm bore shaft applications. Both bearings are in the same heavy-duty class and share similar application profiles.

Q5: What seal and shield options are available for the 351068?

The 351068 is available in three configurations: Open — Standard configuration for applications with external lubrication systems Shielded — Metal shield protection against coarse contamination Sealed — Full rubber or PTFE seal for maximum contamination protection in wet, dusty, or chemically aggressive environments (paper-making, mining)Contact NEXANS Bearing for application-specific seal material recommendations.

Q6: Is the 351068 interchangeable with SKF, FAG, Timken, or NSK equivalents?

Yes. The 351068 is dimensionally equivalent to double row tapered roller bearings from SKF, FAG (Schaeffler), Timken, NSK, NTN, and other major manufacturers sharing the same 340×520×180mm dimensions. NEXANS Bearing manufactures this bearing to the same ABEC/DIN620 dimensional and performance standards, ensuring a direct drop-in replacement for maintenance, MRO, and OEM procurement — at significant factory-direct cost savings.

Q7: What are the shipping and logistics arrangements for the 351068 (119kg)?

The 351068 bearing weighs 119kg, requiring specialized heavy freight handling. NEXANS Bearing has extensive experience shipping large-format industrial bearings globally, using secure reinforced wooden crate packaging, professional heavy freight carriers, and full export documentation including packing lists, commercial invoices, material certificates, and certificates of origin. Contact our logistics team at export@nksbearing.com for freight quotation and delivery timeline.

Why Choose NEXANS Bearing for 351068?

Since 1997, Liaocheng Nexans Bearing Co., Ltd has been a trusted factory-direct manufacturer and global supplier of precision heavy-duty industrial bearings:

Get a Quote Now

Ready to source 351068 Double Row Tapered Roller Bearings for your heavy industrial project, paper-making equipment, mining machinery, rolling mill, or OEM supply needs?

Email: export@nksbearing.com WhatsApp: +86-15562839480 Website: www.nksbearing.com

NEXANS Bearing — Your trusted factory-direct partner for extreme heavy-duty precision bearings since 1997.