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What is the Bolt Pattern for Brake Mounting Flange 4-50  

Question:

Hello - I would like to know the bolt mounting pattern on this flange. What is the distance between diametrically opposite holes? Thanks.

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Expert Reply:

Brake mounting flange # 4-50 has a standard 4 bolt pattern for 8,000 pound brake axles. Diagonally the holes are spaced 5 inches apart on center. Side to side they are 3-7/16 inches apart on center. And top to bottom they are 3-5/8 inches apart on center. I included a picture showing these measurements for you. Basically the part number, 4-50, indicates a 4 on 5 bolt pattern.

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Michael H
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