Baldwin B309 Engine Oil Filter

Baldwin B309 Engine Oil Filter for Case and International Equipment

The Baldwin B309 is an engine oil filter built for Case and International Equipment applications that call for a 1-inch thread, 4 1/4-inch outside diameter, and 7 3/8-inch height. It replaces International 1811953-C1 and uses an integral gasket for a direct-service oil filtration setup.

Key Features

• Part number: Baldwin B309
• Engine oil filter for Case, International Equipment
• Thread size: 1 inch
• Outside diameter: 4 1/4 inches (108 mm)
• Height: 7 3/8 inches (187.3 mm)
• Per inch: 12
• Integral gasket: G401
• Replaces International 1811953-C1

Detailed Description

Baldwin B309 is an engine oil filter specified for Case and International Equipment service where the listed dimensions and thread pattern match the original filter mount. The B309 part number is a practical reference for buyers searching for a Baldwin B309 oil filter, Baldwin B309 replacement, or an engine oil filter for Case, International Equipment with a 1-inch thread and 12 threads per inch. Its 108 mm outside diameter and 187.3 mm height help confirm fitment before installation.

This filter is a direct replacement for International 1811953-C1 and is suited to equipment maintenance where correct oil filtration and proper sealing are required. If you are sourcing a Baldwin B309 for Case, International Equipment, verify the thread, gasket, and overall dimensions against the existing filter and housing before service.

What It Helps Address

• Oil contamination in engines that rely on routine filtration
• Incorrect filter thread or gasket match during replacement
• Service delays caused by using the wrong filter dimensions
• Fitment issues when replacing International 1811953-C1

Installation Notes and Tips

Confirm the 1-inch thread, 12 threads per inch, 4 1/4-inch outside diameter, and 7 3/8-inch height before installation. Check that the integral gasket specification matches the existing sealing surface, and compare the removed filter to the Baldwin B309 to verify the replacement is correct for your Case or International Equipment application. Follow the equipment service procedure for oil filter replacement and sealing checks.

Quality Assurance

Baldwin is a recognized filtration brand in automotive and equipment maintenance, and the B309 is listed with clear dimensional specifications to support accurate parts selection. Use the published measurements and replacement reference to confirm the correct filter for your application.