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1-1/4" Schedule 5 Seamless Pipe 321 - 4'-0" Length | Ace Race Parts

1-1/4" Schedule 5 Seamless Pipe 321 Stainless - 4 Foot Length

Brand: Ace Race Parts
$ 42.80

/ each

Ace Race Parts Schedule 5 321 Stainless Steel Pipe is the perfect solution for small and large turbo manifold applications and can withstand the punishment, vibration, and heat of a high horsepower street, drag, or track car. Pipe size material is the fabricator's choice when fabricating turbo manifolds, dump tubes, and exhaust downpipes. With maximum service temperature ratings from 1598°F to 1652°F and wall thickness options ranging from 0.065" to 0.203", Ace Race Parts' line of pipe size material will help reduce the risk of cracking under even the most extreme conditions. 

Ace Race Parts offers straight lengths of Pipe in 304L Stainless, 321 Stainless, and Mild Steel in sizes ranging from 1-1/4" to 2-1/2" nominal pipe size. Available in Schedule 5, Schedule 10, and Schedule 40, Ace Race Parts 304L and 321 Stainless Steel Pipe is manufactured to the ASTM A312/A312M specification in an ISO 9001 certified facility.


Pipe Size 1-1/4" (1.660")
Schedule 5 (0.065")
Inside Diameter 1.530"
Connection Type Plain End
Finish Mill Finish
ASTM Specification A312

What is Nominal Pipe Size (NPS)?

Often times people use words like "pipe", "piping", "tube", and "tubing" interchangeably and it can get pretty confusing. One area of the fabrication components industry where this terminology can cause some confusion is a term like "intercooler piping". By definition, that is the correct terminology to use; however, if you were looking to fabricate your own intercooler piping and you stumbled across our website, or another website, there might be some confusion during your search for the correct material if you click on the "pipe" category. We strive to make the search for finding the correct material as simple as possible with our website but often times there is confusion between "pipe" and "tube" and which type of material should be used for each job. Generally speaking, in the fabrication components world pipe is used for building turbo manifolds and tube is used for building intercooler piping and exhaust systems. 

Pipe size, or Nominal Pipe Size (NPS), is a North American industry designation, or "trade size", that was standardized by the American Standards Association. The use of the word "nominal" in the NPS designation refers to non-specific terms and identifies the diameter of the hole with a non-dimensional number[1]. For example, one of the most common pipe sizes to use when fabrication a turbo manifold is 1-1/2" Schedule 10; however, the approximate outside diameter (OD) of this material is 1.900" and the approximate inside diameter (ID) is 1.682". Based on those dimensions it's easy to see that even though the material is referred to as 1-1/2" pipe there isn't a single dimension that is actually 1.500". Due to the nominal sizing of pipe we never list or reference the material on our website as a decimal (e.g., 1.500") like we do with tube size material.

Below is a chart of standard pipe sizes ranging from 1/8" to 4".

What is Nominal Pipe Size? — Nominal Pipe Size Chart

Note: This Sch 5 pipe size material is only compatible with other pipe size material (pipe size weld els, tees, reducers, straight lengths, etc). Pipe size material is not compatible with stainless steel tube, tube fittings, or mandrel bends that are sized by the outside diameter.

Please be sure to verify that your selected Schedule 5 Stainless Steel pipe size meets the requirements of your project. It is the customer's responsibility to verify the compatibility of the items in their shopping cart. Ace Race Parts is not responsible for orders with mismatched, or incompatible, products.



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