12 degree bend angle

25 degree bend angle

O.D. (outside diameter) is the standard means of measuring tubing.

I.D. (inside diameter) is typically used to describe pipe sizes.

To find the I.D. of tubing double the wall and subtract it from the O.D.

2.00" - (.065" + .065") = 1.870"

As you can see from the equation above 1-7/8" tubing (1.875) will not slide into
2" 16 gauge (.065) tubing.

Merge Collector Bends are sold as shown. For an additional fee we can swedge the inlet end (short Leg) to allow you to slip fit your primary tubes.

The centerline is the absolute center of the tube.

Just as a race track is measured some distance off of the wall to accurately reflect the usable track surface, the primary tube lengths of a header are calculated using the centerline of the tube.

1008 (Mild) Carbon steel

CREW - Cold Rolled Electronically Welded

AKDQ - Aluminum Killed Drawing Quality

304 stainless steel is the most common stainless alloy tube used in aftermarket exhaust.
To insure quality and consistency we use only A-269 spec. 304 fully annealed, seam welded tubing from Rath-Gibson mills.

304 / 304L is a non-magnetic stainless from the Austenitic family of alloyed steel containing 18% Chromium & 8% Nickel.
It does almost everything you ever wanted your stainless to do and for a relatively low price. It has high strength, ductility, excellent weldability, resistants to corrosion, and polishes to a mirror finish.

304 stainless does have some limitations, it is not well suited for extreme temperatures such as those produced by turbo charged engines. Although 321 stainless is more expensive, the resistance to fatigue at high temperatures makes it a better choice in some applications, saving you money in the long run.

321 stainless steel as a small percentage of titanium added giving it better corrosion resistance, vibrational stability and a higher resistance heat fatigue than 304 stainless.

Commonly used with lighter gauge (wall thickness) for aircraft exhaust & heavier gauge for turbo-charged applications.

We stock tubing in three wall thickness or gauges. Mild steel tubing is available in 16 gauge (.065") and 18 gauge (.049").

In addition to 16 & 18 gauge, some sizes and CLR of 304 & 321 stainless are also available in 20 gauge (.035")

Centerline Radius (CLR) bending is an industry standard.

Leg lengths vary  based on the O.D.of the tube. 

The short leg length is just greater than the tube O.D.   

The long leg length is 2 to 3 times the O.D. depending on the bend angle.

Tangent is the point at which the straight section (leg) of the tubing meets the bent section.

15 degree bend angle

20 degree bend angle

The prefix MCB denotes a Merge Collector Bend in our part numbering system.

Use the buttons above the P/N example to see how we build a part number.

Use the buttons on the left to learn more about the specs and terminology.