35mm Billet 10AN Turbo Drain Oil Flange for Mid-Frame Turbochargers

Stop fighting with generic, cast drain flanges that never quite seal right. This precision-machined 35mm billet 10AN turbo drain flange is built to do the job properly the first time.

Why This Flange Belongs on Your Build

Billet Construction, Not Cast

Machined from billet aluminium for a tighter grain structure, cleaner sealing surfaces, and far better durability than the cast flanges flooding import listings. This is the kind of part you install once and forget about.

Exact 50mm (1.97") Bolt Centre

Engineered specifically for mid-frame turbochargers, which use a 50mm bolt centre — 1.97 inches from the centre of one drain pad bolt hole to the centre of the other. No adapting, no guessing, and no mocking up multiple flanges before you find one that fits.

35mm (1.38") Drain Length

The 35mm figure is the length of the drain — how far the drain body stands off the flange face before your hose connects. This is the shortest of the three lengths we offer, keeping the assembly compact where clearance around the drain pad is not a problem. Also available in 65mm (2.56") and 100mm (3.94") when you need more reach.

10AN Male Port

The -10 AN male port drops straight onto a standard braided stainless return line, helping keep your oil drain plumbing clean and leak-free whether you are running a gravity-drain or a scavenge pump setup.

Compact, Clearance-Friendly Profile

The low-profile design gives you the fitment flexibility you need when engine bay real estate is tight, which is a genuine advantage on builds where packaging matters.

Made in Canada by BSI Inc.

Produced domestically by Black Sheep Industries, this flange ships without the border delays, import duties, or currency-conversion headaches that come with ordering from U.S. suppliers. It is a quality Canadian-made part at a competitive price point, full stop.

A Clean Upgrade Over OEM

Whether you are replacing a worn factory cast flange or building fresh from the ground up — gas or diesel, street or race — the 35mm billet 10AN turbo drain flange is a straightforward, no-compromise upgrade.

Engineered for builders who expect precision — because your oil return line is no place to cut corners.

Not sure which drain you need? See the turbo oil drain guide for bolt centre measurement, length selection, and full sizing charts in metric and US standard.

FAQ

What turbochargers is this flange made for?

It is engineered for mid-frame turbochargers, which use a 50mm (1.97") bolt centre.

What does the 35mm refer to?

35mm (1.38") is the length of the drain, meaning how far the drain body stands off the flange face. It is the shortest option and suits installs where nothing obstructs the drain pad. It is not the bolt centre or the port size.

What is bolt centre?

Bolt centre is the distance from the centre of one bolt hole to the centre of the other on your turbo's oil drain pad. It identifies the frame class: 38mm (1.50") small frame, 50mm (1.97") mid frame, 50.8mm (2.00") large frame.

Is this turbo drain flange billet or cast?

It is machined from billet aluminium, not cast, for cleaner sealing surfaces and better durability than cast flanges.

What oil drain line does the port fit?

The -10 AN male port is designed to connect to a standard braided stainless return line.

Can it be used with a gravity drain or scavenge pump setup?

Yes. The flange is suited for oil drain plumbing whether you are running a gravity-drain or a scavenge pump setup.

Where is this flange made?

It is made in Canada by Black Sheep Industries, also known as BSI Inc.