#3 to 10mm x 1.0 Male Fitting Endura

The Russell #3 to 10mm x 1.0 Male Fitting Endura is a precision straight-thread adapter designed to bridge incompatible fluid line connections in high-pressure hydraulic and fuel systems. This nickel-plated steel fitting converts a #3 AN (Army-Navy) male port to a 10mm x 1.0 metric male thread, making it essential for platform builds, performance modifications, and field repairs where OEM components don't align with aftermarket plumbing configurations.

The fitting features a straight-thread design—no flare or compression seat—which requires compatible adapters or port inserts at both connection points to establish a seal. Nickel plating provides corrosion resistance in high-moisture environments, critical when systems are exposed to salt spray, humidity, or aggressive washdown conditions. At 0.09 lbs and compact dimensions (2.65 x 1.55 x 4.9 inches), the adapter maintains a low-profile footprint suitable for space-constrained engine bays and component layouts. Russell is recognized in the automotive and powersports aftermarket for precision metric and AN fittings that meet OEM specifications and withstand peak system pressures without weeping or failure.

Operators and technicians assembling custom fuel delivery systems, coolant circuits, or transmission cooler lines rely on these metric-to-AN adapters when upgrading components sourced from different manufacturers. Common applications include European metric-threaded cooling systems paired with American AN fuel rails, or bespoke hydraulic setups requiring mixed thread standards. Before installation, verify that both mating ports accept straight-thread (BSPP or equivalent) connections; mismatched seat types—such as applying a straight thread to a flared port—will result in leaks and system failure.