Unequal Male to Male Adaptor - Stainless Steel

OBP AN3 to M10 Male Brake Line Adapter – 303 Stainless Steel

Upgrade your brake system with our precision-machined AN3 to M10 male-to-male brake line adapters, manufactured from grade 303 stainless steel for long-lasting corrosion resistance and reliable performance under pressure.

Designed for motorsport, track day, kit car, and performance road car applications, these adapters allow you to connect AN3 (3/8″ UNF) brake lines to M10 metric brake fittings — one of the most common thread conversions in custom and competition brake system builds.

Available Part Numbers & Thread Configurations:

Key Features & Benefits:

• Material: 303 Stainless Steel – highly resistant to corrosion and brake fluid degradation
• Fitment: AN3 (3/8″ UNF) to M10 metric – one of the most sought-after brake line thread conversions
• Multiple seat configurations – convex, flat, and concave options to match your existing brake line fittings
• Precision machined for leak-free, high-pressure brake line connections
• Suitable for: motorsport, hillclimb, circuit racing, kit cars, classic car restoration, and custom brake system builds

Frequently Asked Questions:

What is an AN3 to M10 brake line adapter used for? It’s used to connect AN-specification (American) brake lines to metric M10 brake ports — common when fitting aftermarket master cylinders, brake bias bars, or calipers from different manufacturers.

What’s the difference between convex and flat seat brake fittings? Convex (also called “bubble”) seats form a seal against a matching cone or flat port. Flat seat fittings seal against a flat face. Always match the seat type to your existing components to ensure a leak-free connection.