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The Stainless Bros 2.5in Diameter 1D / 2.5in CLR 2in Leg / 2in Leg Mandrel Bend (part number 601-06326-4100) is a compact tight-radius 90-degree tube section for custom exhaust and turbo plumbing in space-constrained builds. Bent from 16-gauge 304 stainless steel using mandrel-bending tooling, this component maintains a fully round cross-section through the 90-degree sweep to maximize flow in tight quarters. The 1D radius at 2.5in CLR and the short 2-inch legs on each side make this bend ideal for chassis pockets, tunnel routing, and tight engine bay clearance requirements where a longer-leg version will not fit.
Features and Benefits
- 16-gauge (0.065in wall) 304 stainless steel handles high exhaust temperatures without corrosion
- Mandrel-bent 1D tight radius delivers a 2.5in CLR for the most compact 90-degree turn possible in 2.5in tubing
- 2in legs on each end allow trimming to exact fit without sacrificing the bent section
- Consistent bore throughout eliminates kinks or flats that create turbulence and backpressure
- Polished OD surface is clean and ready for TIG or MIG welding after acetone wipe-down
- Short-leg design minimizes space requirement while still providing workable trim length
- Pairs with standard 2.5in couplers, V-bands, and flanges for complete system fabrication
- Part of the Stainless Bros SS304 mandrel bend family for consistent quality across a full system build
Specifications
| Specification | Detail |
|---|---|
| Part Number | 601-06326-4100 |
| Brand | Stainless Bros |
| Material | 304 Stainless Steel |
| Wall Thickness | 16 gauge / 0.065in |
| Tube OD | 2.50in |
| Bend Radius | 1D / 2.5in CLR |
| Bend Angle | 90 Degree |
| Leg Length | 2in / 2in |
| Finish | Polished OD |
| Warranty | Stainless Bros limited warranty |
What's Included
- 1 x Stainless Bros 2.5in 90-degree 1D tight-radius mandrel bend (part 601-06326-4100)
- 2in straight leg on each end
Frequently Asked Questions
What is the tube OD for the 601-06326-4100?
The outside diameter is 2.50 inches. This mates with 2.5in exhaust couplers, V-band flanges, and other tubing components rated for 2.5in OD.
When should I choose the 1D tight radius over the 1.5D loose radius at 2.5 inches?
The 1D tight radius (2.5in CLR) is used when space is the primary constraint and the flow restriction of a tighter bend is acceptable. Use the 1.5D loose radius when you have more room and want to optimize flow velocity through the bend.
How short are the legs on this bend?
Each leg is 2 inches. This is a short-leg version designed for tight installations. If you need more straight material, plan to butt-weld a straight tube section to the leg before the bend.
Is the 601-06326-4100 suitable for intercooler piping on a turbocharged vehicle?
Yes. 304 stainless handles boost pressure and charge air temperatures well. The mandrel-bent bore prevents flow restriction that would otherwise heat charge air unnecessarily. Use silicone couplers and T-bolt clamps to connect to the intercooler end tanks.
What welding process is recommended for this Stainless Bros bend?
TIG welding with ER308L filler rod is the recommended process for stainless-to-stainless joints. Use argon shielding gas at the torch and back-purge with argon to prevent sugaring on the inside of the weld.
What is the wall thickness of this mandrel bend?
The wall is 16 gauge / 0.065 inches. This is the standard wall for the Stainless Bros mandrel bend catalog and provides a good balance of rigidity, weight, and weldability.
Can I use this bend in a mild steel exhaust system?
Yes, with ER309L filler rod for the dissimilar metal welds at the joints. The stainless bend section will outlast mild steel sections and is a common upgrade choice for the bend sections of otherwise mild-steel exhaust systems.
Is this bend compatible with other Stainless Bros mandrel bend components?
Yes. All Stainless Bros 16-gauge SS304 mandrel bends at 2.5in share the same wall thickness and OD, making them directly compatible with each other and with other Stainless Bros tubing and components at this diameter.
Installation Instructions
- Confirm clearance for the 90-degree arc using a cardboard mockup before purchasing additional components.
- Dry-fit the 601-06326-4100 with surrounding tubing to verify the 2in leg lengths are sufficient or if extension sections are needed.
- Mark and cut leg sections to required length using a tubing cutter or cutoff wheel.
- Deburr all cut ends to remove sharp edges before welding.
- Clean all weld surfaces with acetone.
- Tack-weld in position, check alignment, then complete circumferential welds.
- Inspect finished welds before installing on the vehicle.
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