Turbo Accessories
V-BAND 3.5″ 316 STAINLESS STEEL TURBO INLET FLANGE 1/2″ HEAVY DUTY
KEY FACT
The V-Band 3.5″ Turbo Inlet Flange is a 1/2″ (12.7 mm) 316 Stainless Steel precision-machined component designed for any turbocharger with a 3.5-inch V-Band inlet housing. CNC laser-cut to ±0.003-inch flatness, ASTM A240 316 certified, and priced at $58.56 — in stock with same-day dispatch.
SKU: TIFVBAND316STAINLESSHEAVYDUTY
It suits any turbocharger with a 3.5-inch V-Band inlet housing, providing a clamp-based seal (V-Band clamp) with 360-degree rotation for tight manifold routing. Manufactured from ASTM A240 316 stainless steel with added molybdenum, it handles 925°C (1700°F) continuous and outperforms 304 in chloride-rich and methanol environments. The 1/2-inch heavy-duty thickness is recommended for diesel engines, large-displacement builds, and any setup with a rigid unsupported downpipe. Every flange is CNC laser-cut and surface-ground to ±0.003-inch flatness with bolt holes reamed to H7 tolerance, providing a gas-tight metal-to-metal seal without a gasket on properly prepared turbos.
✓ Free shipping on orders over $150
✓ Same-day dispatch on orders before 2 PM EST
✓ 30-day returns for unused items
✓ Pickup available in Miami, FL 33172 — by appointment
Technical Specifications
| Inlet Port Size | 3.50 in bore |
|---|---|
| Flange O.D. | 4.25 in OD |
| Bolt Pattern | V-Band clamp |
| Thickness | 1/2″ (12.7 mm) |
| Max Temperature | 982°C / 1800°F |
| Material | 316 Stainless Steel |
| Standard | ASTM A240 316 |
| Surface Finish | Ra 1.6 μm brushed |
| Flatness | ±0.003 in |
| Bore Tolerance | H7 reamed |
Material Comparison Guide
304 Stainless vs 316 Stainless vs Carbon Steel vs Inconel 625 — your selection is highlighted
| Specification | 304 Stainless | 316 Stainless YOUR SELECTION | Carbon Steel | Inconel 625 |
|---|---|---|---|---|
| Max Continuous Temp | 871°C (1600°F) | 925°C (1700°F) | 425°C (800°F) | 1093°C (2000°F) |
| Corrosion Resistance | Good | Excellent | Poor (needs coating) | Excellent |
| Weldability | Excellent | Excellent | Excellent | Good |
| Cost (relative) | $$ | $$$ | $ | $$$$ |
| Best For | Street / track | Marine / E85 / diesel | Budget builds / coated manifolds | Extreme boost / compound turbos |
| Standard | ASTM A240 304 | ASTM A240 316 | ASTM A36 | AMS 5666 |
| Recommended Gasket | Optional | Optional | Recommended | Optional |
Frequently Asked Questions
About the V-Band 3.5″ 316 Stainless Steel Turbo Inlet Flange 1/2″ Heavy Duty
Does this flange fit my turbo?
Yes — this V-Band flange fits any turbocharger with a 3.5-inch V-Band inlet housing, including many Garrett GTX, BorgWarner EFR, and Turbonetics units with V-Band inlet configurations.
Why should I choose 316 Stainless Steel for a turbo inlet flange?
316 stainless adds molybdenum, which dramatically improves resistance to chloride corrosion and raises the service temperature ceiling versus 304. It is the correct choice for marine environments, diesel builds, and any car running E85 or water-methanol injection.
Should I choose the 3/8-inch or 1/2-inch thickness?
The 1/2-inch (12.7 mm) heavy-duty thickness is correct for diesel engines, large-displacement V8 builds, and any application where the downpipe is rigid and places bending stress on the flange. For lighter gasoline builds, the standard 3/8-inch option saves weight and cost.
How do I install the V-Band 3.5″ turbo inlet flange?
Clean the turbo inlet face and remove all old gasket material. Align the flange with the N/A bolt holes and thread the V-Band bolts in finger-tight. Torque in a cross pattern to spec (M8: 18–25 Nm · M10: 30–40 Nm · M12: 50–65 Nm). A 1/16-inch Cometic MLS gasket is recommended on builds over 25 PSI.
Does this flange need a gasket?
A gasket is not strictly required — the face is ground to Ra 1.6 μm, which creates a metal-to-metal seal on most turbos. However, a 1/16-inch multi-layer steel (MLS) gasket is recommended for builds over 25 PSI boost or on turbos with minor surface irregularities.
What is the price of the V-Band 3.5″ 316 Stainless Steel Turbo Inlet Flange 1/2″ Heavy Duty?
The V-Band 3.5″ 316 Stainless Steel Turbo Inlet Flange 1/2″ Heavy Duty is $58.56 per piece with free shipping on orders over $150. It is in stock and ships same day when ordered before 2 PM EST.