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Product Description
The M268749TDIT (also referenced as M268749TD) is a heavy-duty double row tapered roller bearing featuring a unique structural design: a single one-piece double inner race (cone) combined with two individual single outer races (cups). This configuration delivers exceptional combined radial and axial load capacity, making it one of the most capable bearing solutions for extreme industrial applications.
With a bore diameter of 415.925 mm (16.3750 in), outer diameter of 590.550 mm (23.2500 in), and an overall width of 209.550 mm (8.2500 in), the M268749TDIT belongs to the large-bore heavy-duty bearing category — specifically engineered for applications where standard single-row bearings cannot meet load and durability requirements.
Manufactured to ABMA/ANSI and ISO dimensional standards, this bearing is widely used in gearboxes, hoisting equipment, rolling mills, and heavy mining machinery worldwide — and is dimensionally interchangeable with equivalent bearings from Timken, SKF, and other leading manufacturers.
Parameter | Imperial | Metric |
Bearing Number | M268749TDIT / M268749TD | M268749TDIT / M268749TD |
Bore Diameter (d) | 16.3750 in | 415.925 mm |
Outer Diameter (D) | 23.2500 in | 590.550 mm |
Overall Width (T) | 8.2500 in | 209.550 mm |
Bearing Type | Double Row Tapered Roller Bearing | — |
Inner Race (Cone) | Single One-Piece Double Cone | — |
Outer Race (Cup) | Two Single Cups | — |
Series | Imperial Heavy-Duty | — |
Load Type | Combined Radial & Axial (Thrust) | — |
Configuration | TDI — Tandem Double Inner Ring | — |
✅ TDI Double Row Configuration — Single one-piece double cone paired with two individual cups provides superior load distribution, higher rigidity, and greater axial load capacity compared to standard single-row designs
✅ Extreme Combined Load Capacity — Engineered to simultaneously handle heavy radial loads and bidirectional axial (thrust) loads — ideal for large shaft assemblies under complex loading conditions
✅ One-Piece Double Inner Race — The integrated double cone eliminates the need for separate inner ring alignment, improving assembly accuracy and reducing installation time in heavy industrial settings
✅ Large-Bore Heavy-Duty Format — 415.925mm bore and 590.550mm OD make this bearing suitable for the largest industrial shaft assemblies in rolling mills, mining equipment, and heavy gearboxes
✅ High Rigidity & Stability — Double row roller contact provides enhanced shaft rigidity and minimizes deflection under heavy dynamic loads — critical for precision industrial machinery
✅ Cross-Brand Interchangeability — Dimensionally equivalent to Timken, SKF, FAG, and NSK counterparts — enabling flexible sourcing and seamless maintenance replacement
The M268749TDIT double row tapered roller bearing is engineered for the most demanding heavy industrial environments: [1] [2] [3]
Industrial Gearboxes — Heavy-duty gearbox main shafts requiring combined radial and axial load support with high rigidity
Hoisting & Lifting Equipment — Crane and hoist drum shaft bearings where bidirectional axial loads are critical
Rolling Mills — Roll neck bearings in steel, aluminum, and other metal rolling mill applications
Mining Machinery — Tunneling machines, crushers, and mining conveyor drive shaft assemblies
Heavy Construction Equipment — Large excavator, bulldozer, and heavy crane drivetrain bearing positions
Large Industrial Machinery — Any heavy-shaft application requiring maximum combined load capacity and long service life
Since 1997, Liaocheng Nexans Bearing Co., Ltd has been a trusted factory-direct manufacturer and global supplier of precision heavy-duty bearings. Here's why industrial buyers and distributors worldwide choose NEXANS:
Advantage | Details |
Factory Direct Supply | No middlemen — manufactured and shipped directly from our Liaocheng facility |
Full OEM Service | Custom branding, private-label packaging, and tailored documentation available |
Reliable Global Logistics | Consistent stock with fast international shipping to 30+ countries |
Strict Quality Control | Full dimensional inspection, hardness testing, and load performance verification per ABMA/ISO standards |
Expert Technical Support | Engineering guidance for bearing selection, installation, preload setting, and application optimization |
Competitive Factory Pricing | Direct manufacturing cost advantages — ideal for bulk procurement and OEM distribution |
Q1: What is the structural difference between M268749TDIT and a standard single-row tapered roller bearing?
The M268749TDIT uses a TDI (Tandem Double Inner) configuration — a single one-piece double inner cone combined with two individual outer cups. This double-row structure provides significantly higher combined radial and axial load capacity, greater shaft rigidity, and better resistance to moment loads compared to any standard single-row tapered roller bearing.
Q2: What does "TDIT" mean in the bearing designation M268749TDIT?
The suffix "TDIT" indicates a Tandem Double Inner ring, Tandem-mounted configuration. This means the bearing uses a single integrated double cone (inner race) with two separate cups (outer races), arranged to handle combined radial and bidirectional axial loads — a design specifically optimized for heavy industrial gearboxes, hoisting equipment, and rolling mill applications.
Q3: What industries and machines use the M268749TDIT bearing?
The M268749TDIT is primarily used in heavy industrial applications including large gearboxes, hoisting and lifting equipment, steel rolling mills, mining tunneling machines, crushers, and heavy construction machinery. Its large 415.925mm bore and double-row design make it the preferred choice wherever extreme combined loads and maximum shaft rigidity are required.
Q4: Is M268749TDIT interchangeable with Timken, SKF, or other major brands?
Yes. The M268749TDIT is dimensionally interchangeable with equivalent bearings from Timken, SKF, FAG, NTN, and other major manufacturers. NEXANS Bearing produces this bearing to the same ABMA/ISO dimensional standards, ensuring a direct drop-in replacement for maintenance, MRO, and OEM procurement purposes.
Q5: Can NEXANS Bearing supply M268749TDIT with custom OEM branding and packaging?
Absolutely. NEXANS Bearing offers complete OEM services — including custom brand labeling, private-label packaging, and tailored shipping documentation. Whether you are a distributor, OEM equipment manufacturer, or MRO supplier, we support your full branding and supply chain requirements at factory-direct pricing. Contact us at export@nksbearing.com for OEM inquiry details.
Q6: How is the M268749TDIT bearing installed and what preload setting is required?
The M268749TDIT double row bearing requires careful preload setting during installation to ensure optimal performance and service life. The two-cup assembly must be correctly positioned relative to the double cone, with preload adjusted per the equipment manufacturer's specifications. NEXANS Bearing's technical team provides full installation guidance and preload recommendations — contact us via WhatsApp (+86-15562839480) for application-specific support.
Q7: What is the MOQ and lead time for M268749TDIT bearing orders?
MOQ and lead times vary based on order volume and customization requirements. Standard lead time is 7–15 business days for stock items and 20–35 business days for OEM custom orders. Expedited production is available for urgent requirements. Contact our team via WhatsApp (+86-15562839480) or email export@nksbearing.com for real-time availability and pricing.
Q8: How does NEXANS Bearing ensure quality for the M268749TDIT bearing?
Every M268749TDIT bearing undergoes strict dimensional inspection, hardness testing, cone-cup geometry verification, and load performance testing at our Liaocheng manufacturing facility. We adhere to ABMA and ISO quality standards, ensuring internal clearance, preload geometry, and surface finish all meet specification before shipment.
Ready to source M268749TDIT Double Row Tapered Roller Bearings for your heavy industrial project, maintenance, or OEM distribution needs?
Email: export@nksbearing.com
WhatsApp: +86-15562839480
Website: www.nksbearing.com
NEXANS Bearing — Your trusted factory-direct partner for heavy-duty precision bearings since 1997.
