65mm Billet 10AN Turbo Drain Oil Flange for Small-Frame Turbochargers

Stop chasing leaks with generic flanges that never quite fit. This precision-machined billet aluminium drain flange is built to small-frame specs from the ground up.

Features & Benefits

Purpose-Built 38mm (1.50") Bolt Centre

Engineered specifically for small-frame turbocharger centre sections, including popular GT28, GT30, GT35, HX30, and HX35 series units. Bolt centre is measured from the centre of one drain pad bolt hole to the centre of the other — 38mm, or 1.50 inches, on small frame. No adapters, no shimming, no guesswork — just a clean, flush mount every time.

65mm (2.56") Drain Length

The 65mm figure is the length of the drain — how far the drain body stands off the flange face before your hose connects. It is the middle of the three lengths we offer, with enough standoff to clear most obstructions without adding bulk. Also available in 35mm (1.38") for the tightest installs and 100mm (3.94") when you need more reach.

Billet Aluminium Construction

CNC-machined from solid billet aluminium for the rigidity and leak-free sealing surface that stamped or cast flanges simply can't match. Whether you're running a gravity drain into the oil pan or a scavenge pump return, this flange holds up to the demands of a hard-working turbo build.

Integrated 10AN Male Port

The AN-10 drain port is machined directly into the flange body, so your oil return line connects straight. No extra fittings or adapters stacking up in an already tight engine bay means less hardware, fewer potential leak points, and a cleaner install.

Precision Sealing Surface

The machined mating face is held to tight tolerances for a reliable O-ring seal against the turbo centre cartridge — critical for keeping oil where it belongs on any build, from a weekend street car to a full turbo rebuild or performance swap.

Canadian-Made Quality

Manufactured by BSI Inc. right here in Canada, this 65mm billet 10AN turbo drain flange small frame is built to a standard that imported alternatives rarely meet — and ships quickly to builders across North America.

Built right, priced right, and ready to drop into your next turbo project — because your oil drain deserves the same attention as everything else in your build.

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 drain flange designed for?

It is engineered for small-frame turbocharger centre sections with a 38mm (1.50") bolt centre, including popular GT28, GT30, GT35, HX30, and HX35 series units.

What does the 65mm refer to?

65mm (2.56") is the length of the drain, meaning how far the drain body stands off the flange face. It is a clearance and routing choice, 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.

Does this flange require extra adapters?

No. The AN-10 drain port is machined directly into the flange body, so your oil return line connects straight without stacking extra fittings or adapters at the flange.

What is the flange made from?

It is CNC-machined from solid billet aluminium for rigidity and a leak-free sealing surface.

How does this flange seal against the turbo?

The machined mating face is held to tight tolerances for a reliable O-ring seal against the turbo centre cartridge.

Is this turbo drain flange made in Canada?

Yes. It is manufactured by BSI Inc. in Canada and ships quickly to builders across North America.