What is SS321 stainless steel and why is it used for exhaust?

SS321 is a type of stainless steel that includes titanium. This addition helps stabilize the material at high temperatures, making it more resistant to corrosion and cracking in the harsh conditions found in exhaust systems.

What does '1D radius' mean for this bend?

A 1D radius means the center of the bend is one times the tube's diameter away from the edge of the tube. For a 4-inch tube, this creates a relatively tight, smooth curve that is often preferred for custom exhaust routing.

What is the advantage of mandrel bending?

Mandrel bending uses a support inside the tube to prevent it from collapsing or kinking during the bending process. This ensures the tube's diameter stays consistent throughout the bend, which is important for maintaining smooth exhaust flow.

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Specifications

Brand: Stainless Bros
Part #: 701-10256-3100
UPC: 701-10256-3100

Stainless Bros 4in SS321 90 Deg Mandrel Bend Elbow - 1D Radius 16GA/.065in Wall (No Leg)

Name: Stainless Bros 4in SS321 90 Deg Mandrel Bend Elbow - 1D Radius 16GA/.065in Wall (No Leg)
Brand: Stainless Bros
SKU: stainless-bros-stainless-bros-4in-ss321-90-deg-mandrel-bend-elbow-1d-radius-16ga-t14-548491
Price: 92.15 USD
Availability: InStock

$92.15

Only 5 left in stock

Stainless Bros 4in SS321 90 degree mandrel bend elbow. 16 gauge wall thickness, 1D radius.

Key Features

Fits 4-inch diameter tubing.
Made from SS321 stainless steel for improved high-temperature corrosion resistance.
Features a 1D radius for a smooth, tight bend.
Tubing wall thickness is 16 gauge (.065 inches).
Mandrel bent to maintain consistent diameter through the curve.
No legs means straight-cut ends for easy fabrication.

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About this part

Product Details

This is a 4-inch diameter, 90-degree mandrel bend elbow from Stainless Bros, made from SS321 stainless steel. It features a 1D radius, meaning the center of the bend is one times the tube diameter away from the tube's edge, creating a smooth, tight curve. The tubing is 16 gauge thick, or .065 inches, offering a good balance of strength and weldability for exhaust fabrication projects. This particular elbow has no legs, meaning the ends are cut straight for easy integration into custom exhaust systems.

The SS321 stainless steel is a popular choice for exhaust components because it contains titanium, which helps prevent carbide precipitation at high temperatures. This makes it more resistant to corrosion and cracking in demanding exhaust environments compared to standard 304 stainless steel. The mandrel bending process ensures that the tube maintains its diameter throughout the bend, which is crucial for maintaining exhaust flow and preventing restrictions that can hurt performance.