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Finding and Comparing Bosch Part Specifications

Part specifications serve an important aspect in choosing the correct part. The SparkPlugs.com Family of sites has multiple tools to assist you in deciphering part numbers and features.

 

Part Number Charts:

From any page on the site, click on the "Learning Center" link in the footer.

Learning Center Links

 

Click on "Charts & Tools". 

Use the Heat Range Conversion Chart to compare the heat ranges between spark plug brands.

Use the Bosch Numbering System to decipher Bosch's alphanumeric part system.

Specification Tools

 

Part Specification Listings:

All available part specifications have been included in the part details page.

Use the site search box to find the part number you wish to see the specs for. Click on the "Product Specifications" tab. Available specs may include dimensions, features, materials, longevity and warranted life.

Part Detail Page

Specifications Tab

 

Compare Tool:

Use the "Compare" button to select up to 4 parts within the same product type and compare their specs. Available specs may include dimensions, features, materials, longevity and warranted life.

Click the "Compare" button on all parts you'd like to compare the specs on.

Compare Button Example

 

Click the "Compare Now" button when you're finished selecting parts. Compare Now Button Example

 

Click the red "X" next to a product to remove it from the comparison, or click "Clear list" to remove all items.Compare Products Results Page

 

Examples of how to use these tools...

#1 - What is the difference between Bosch YR7SII33T and YR7SII33U?

Using the Bosch Numbering System, we see that the last set of letters at the end of a part number designates the gap setting. YR7SII33T has a 0.8mm gap and YR7SII33U has a 1.0mm gap.

Bosch Numbering System Gap Designation

We can confirm by looking at the specs tab for YR7SII33T, which identifies the plug as having a 0.8mm or .031" gap.  

Bosch YR7SII3T Gap Setting

 

#2 - What is the difference between Bosch FR6KII33X, FR7KII33X and FR8KII33X?

Again using our Bosch numbering system, we find that this first number designates the heat range. We also see that a Bosch 6 is colder than a 7, and an 8 is hotter than a 7.

Bosch Numbering System Heat Range

 

#3 - Let's take a non spark plug example. We've used the cross-reference to find the Bosch equivalent to an NGK/NTK 21006. The results give us two Bosch options, 13026 and 15703.

Cross Reference Example

 

Looking at the pictures, the two Bosch sensors appear identical. By using the "Compare" tool and viewing the specs, we find that 15703 features a 305mm or 12" lead wire, while 13026 features a 368mm or 14.5" lead wire. Knowing the needed distance between our sensor and plug will help us determine if the 12" or 14.5" lead wire would be a better fit.

Comparing Product Specs