357-04 -4 male to M12 x 1.0 male

Speedflow 357-04 | -4 AN Male to M12 x 1.0 Male Adapter

The Speedflow 357-04 is a precision-machined -4 AN male to M12 x 1.0 male straight adapter, designed to connect -4 AN fittings directly to components with an M12 x 1.0 metric fine-thread male port. An essential adapter for builders working with Japanese and European OEM brake, clutch, and hydraulic components alongside AN-style braided line systems.

Product Specifications

• Part Number: 357-04
• AN End: -4 AN male
• Metric End: M12 x 1.0 male (metric fine thread)
• Series: Speedflow 357 — AN Male to Metric Male Adapters
• Compatible With: Standard -4 AN fittings and M12 x 1.0 female ports
• Barcode: 9342122002885

Applications

The 357-04 is a key adapter for metric-to-AN conversions in performance and motorsport builds, including:

• Connecting -4 AN braided brake lines to Japanese and European OEM components with M12 x 1.0 ports
• Brake caliper, master cylinder, and ABS modulator connections on metric brake systems
• Clutch slave cylinder hydraulic line adaptations
• Motorsport and track-day builds converting metric OEM brake lines to AN braided
• Any application requiring a direct -4 AN male to M12 x 1.0 male thread conversion

M12 x 1.0 — Common Metric Port Standard

The M12 x 1.0 fine thread is widely used across Japanese and European OEM brake calipers, master cylinders, and clutch components. When building AN braided line systems on metric-spec vehicles, the 357-04 provides a clean, single-piece male-to-male adapter solution — eliminating the need for additional unions or custom fabrication. Note that M12 comes in two common pitches: 1.0mm and 1.25mm — always verify your component’s thread pitch before ordering, as these are not interchangeable.

Sold individually. Compatible with standard -4 AN fittings and components with M12 x 1.0 female ports.