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399A-394YD TDO (Two-Row Double-Outer Race) (Imperial)

399A-394YD TDO (Two-Row Double-Outer Race) (Imperial)

The 399A-394YD is a two-row tapered roller bearing with a 2.6875″ bore and 4.3307″ outer diameter, built from sturdy chrome steel. It handles combined loads up to 38700 lbf and is designed for long-lasting performance.

Its double-row construction provides extra stability, while the open design allows for easy lubrication. The bearing operates smoothly in temperatures from -30°C to 110°C.

This model is part of the 395 series and comes with standard cups for straightforward installation. Ideal for heavy-duty applications like truck axles or industrial gearboxes where combined loads are common.

Weighing 3.68 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, ensuring safe and reliable use.

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Product Parameters

  • Part Number 399A-394YD
  • Brand TFL
  • Size 2.6875" x 4.3307" x 0.866"
  • Bore Dia 2.6875"
  • Bore Dia Tolerance +0.005" to 0
  • Outer Dia 4.3307"
  • Outer Dia Tolerance +0.001" to 0
  • Double Cup Width 1.8125"
  • Double Cup Width Tolerance +0.003" to -0.01
  • Cone Width 0.866"
  • Cone Width Tolerance +0.002" to -0.01
  • Bearing Width Across Cups 2.0624"
  • Bearing Width Across Cups Tolerance +0.008" to 0
  • Cup Backface ToClear Radius 0.03"
  • Cone Backface Backing Diameter 3.07"
  • Cup Frontface Backing Diameter 4.12"
  • Cage Cone Backface Clearance 0.05"
  • Dynamic Radial Load 38700 lbf
  • System of Measurement Inch
  • Type Bearing
  • Cone Part Number 399A
  • Cup Part Number 394YD
  • Bearing Type Roller
  • Roller Bearing Type Tapered
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Cups Type Standard
  • Series 395
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Cage Material Steel
  • Dynamic Radial Rating(One Row 90 Million Revolutions) 5760 lbf
  • Dynamic Thrust Rating(90 Million Revolutions) 3970 lbf
  • Dynamic Radial Rating(Two Row 90 Million Revolutions) 10000 lbf
  • Lubrication Required
  • Temperature Range -30° to 110 °C
  • ABEC Rating ABEC-1
  • Radial Clearance Standard (Available in C3/C4/C5)
  • RoHS Compliant
  • REACH Compliant
  • Weight 3.68 lb

Features

How Is 399A-394YD Bearing Engineered for Reliability?

399A-394YD Bearing features a double-row tapered roller design, providing excellent load distribution and stability.
Its chrome steel construction ensures durability under combined radial and thrust loads.
With a dynamic radial load capacity of 38,700 lbf, it handles heavy-duty applications with ease.
The standard radial clearance options allow for flexibility in various operating conditions.

What Makes 399A-394YD Bearing Suitable for High-Temperature Applications?

399A-394YD Bearing operates reliably in temperatures ranging from -30° to 110 °C.
Its chrome steel rollers and rings maintain structural integrity even under thermal stress.
The open design allows for effective lubrication, preventing overheating during prolonged use.
This makes it ideal for industrial environments with fluctuating temperatures.

Built for Durability: 399A-394YD Bearing

399A-394YD Bearing’s double-row construction enhances its load-bearing capacity and longevity.
The steel cage keeps the tapered rollers aligned, reducing friction and wear.
Its precise tolerances ensure consistent performance over extended periods.
With a weight of 3.68 lb, it offers a robust yet manageable solution for heavy machinery.

Steel vs Ceramic Bearings: Strengths of 399A-394YD Bearing

399A-394YD Bearing uses chrome steel for both rollers and rings, providing excellent strength and wear resistance.
This material choice ensures reliable performance in high-load scenarios without brittleness concerns.
The steel cage further enhances durability while maintaining cost-effectiveness.
Its ABEC-1 rating confirms consistent precision for industrial applications.

Application

Industrial Uses of 399A-394YD Bearing
The 399A-394YD Bearing is commonly used in heavy machinery like construction equipment and agricultural vehicles, where its double-row design handles combined radial and thrust loads efficiently. Its chrome steel construction ensures durability even in demanding environments.

In automotive applications, 399A-394YD Bearing fits well in wheel hubs and differential systems, providing reliable performance under varying load conditions. The inch sizing makes it a preferred choice for North American vehicle manufacturers.

For industrial automation, 399A-394YD Bearing supports conveyor systems and robotic arms, where its open design allows for easy lubrication and maintenance. The tapered roller design ensures smooth operation at moderate speeds.

What Makes 399A-394YD Bearing a Preferred Choice?
The 399A-394YD Bearing’s standard radial clearance and ABEC-1 rating make it versatile for general machinery applications. Its steel cage adds stability, reducing wear over time.

In mining equipment, 399A-394YD Bearing withstands high radial loads, making it suitable for crushers and screening machines. The double-row configuration distributes stress evenly, extending service life.

Built for Heavy-Duty Use: 399A-394YD Bearing
The 399A-394YD Bearing excels in applications like gearboxes and pumps, where its combined load capacity is essential. Its temperature range of -30° to 110°C ensures performance in diverse climates.

For material handling systems, 399A-394YD Bearing’s robust design reduces downtime in high-use scenarios. The open seal type simplifies inspections and relubrication.

Automotive vs Aerospace: Applications of 399A-394YD Bearing
In automotive systems, 399A-394YD Bearing is ideal for axles and transmissions, offering balanced load handling. Its inch measurements align with standard US automotive specifications.

For aerospace ground support equipment, 399A-394YD Bearing provides reliable performance in tow tractors and loading systems. The chrome steel rollers resist wear under frequent use.

Q&A

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