Tensioner Pulley Bearing Cross-Reference Chart: OTT vs INA vs SKF vs Koyo (2026)

Finding the right cross-reference for tensioner bearings is one of the biggest challenges for pulley assemblers and aftermarket distributors. This chart maps OTT part numbers to the most common OEM and aftermarket brands.

## How to Use This Cross-Reference

Each OTT tensioner bearing is dimensionally identical to its INA/SKF/Koyo equivalent — same bore diameter, outer diameter, width, and seal type. This means direct drop-in replacement without any modification to your pulley housing or assembly tooling.

## Cross-Reference Table: Small Tensioner Bearings (6200 Series)

| OTT Model | Dimensions (d×D×B) | INA Equivalent | SKF Equivalent | Koyo Equivalent | Application | |---|---|---|---|---|---| | 6202 | 15×35×11 | — | 6202-2RS | 6202-2RS | Idler pulleys, small tensioners | | KN6006 | 30×55×13 | — | — | — | Extended inner ring tensioners | | 6301 | 12×37×12 | — | 6301-2RS | 6301-2RS | Compact tensioners | | 6303 | 17×47×14 | — | 6303-2RS | 6303-2RS | Medium tensioners | | 6203 | 17×40×12 | — | 6203-2RS | 6203-2RS | Standard idler pulleys |

## Cross-Reference Table: Eccentric Tensioner Assemblies

| OTT Model | Base Bearing | Dimensions | OEM Application | |---|---|---|---| | VKM74200 | 3203 | Bore 9×OD 52×W 25 | Timing belt tensioner | | VKM13100 | 3203B21 | 13.2×59×22 | Renault/Peugeot timing | | B10-5280 | 3304-17 | 10.2×37×24 | Fiat/Lancia timing | | 830700 | 6004-10.5 | 63.5×32.5×10.3 | General purpose |

## Why Cross-Reference Accuracy Matters

When a tensioner pulley assembler switches from INA or SKF to a Chinese supplier, dimensional accuracy is critical:

Bore tolerance: Must match ±0.005mm for proper press-fit into the pulley housing
Outer race tolerance: Must match ±0.008mm for smooth rotation
Width tolerance: Must match ±0.05mm to avoid interference with belt alignment
Radial clearance: Must match the original spec (typically C2 or C3 for tensioner applications)

OTT maintains P6 precision grade as standard (P5 available on request), ensuring every bearing is a true dimensional match to the INA/SKF original.

## How to Request a Full Cross-Reference

OTT maintains a comprehensive cross-reference database covering 80+ tensioner bearing models. To get the exact OTT equivalent for your current bearing:

1. Send us your current part number (INA, SKF, FAG, Koyo, NTN, or OEM number) 2. We'll provide the OTT model number, dimensions, and pricing within 12 hours 3. Free samples available for testing in your assembly line