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Stainless Steel Hollow Bar

Hollow Bars offer excellent machining properties, which allows for increased cutting speeds, decreased tool wear, and faster set up times.

Penn Stainless supplies hollow bar in common grades of stainless steel such as 304, 304L, 316, and 316L in standard sizes and wall thicknesses. We can also supply less common austenitic stainless steel bar in 304H, 309S, 310S, 317L, 321H, 347H. We also supply seamless stainless steel hollow bar for machining applications with wall thicknesses in excess of 2″ for some stainless grades. Most sizes of seamless stainless steel and nickel tube can be cut to exact sizes. Non standard sizes can be made to order. Contact our team today and tell us your exact stainless steel bar requirement.

Additionally, stop by our Processing Services and Testing Services pages. At Penn Stainless, we provide many of these services in-house, ultimately delivering an improved product while still saving time.

Stainless Steel Hollow Bar

Diameter of Stainless Steel Hollow Bar

1/16″ thru 14″ / light and heavy wall thickness available Get a Quote

300 Series Stainless Steel Grades

304 – 304L – 304H – 309 – 309S – 309H –310– 310S – 310H – 316 – 316L – 317L – 321 – 321H – 347 – 347H Get a Quote

400 Series Stainless Steel Grades

410 - 410S Get a Quote

Stainless Steel Pipe & Tube Grades

Stainless 304/304L

With 18 percent chromium and 8 percent nickel, 304 is the most common stainless steel grade. 304L is the low carbon version of 304. All tubular products are readily available in 304 and 304L stainless steel Data Sheet Technical Question? Get a Quote

Stainless 304H

Like standard 304, this grade is also an 18 percent chromium and 8 percent nickel stainless steel. This grade requires a minimum carbon content of .04. The higher carbon content gives 304H greater heat resistant qualities, higher yield strength, and better short term and long term creep strength. Longer lead times could be required to deliver 304H in some tubular forms. Data Sheet Technical Question? Get a Quote

Stainless 316/316L

This grade has more nickel than 304 and 304L and includes molybdenum. 316 and 316L have superior corrosion resistance to 304 and 304L in most instances.  316 and 316L stainless steel is readily available in all product forms. Data Sheet  Technical Question?  Get a Quote

Stainless 317/317L

317 and 317L contain more molybdenum and has overall better corrosion resistance resistance than 304, 304L, 316, and 316L stainless steels. 317L offers higher resistance to chloride pitting compared 304L and 316L. 317 and 317L is available in seamless pipe. Other tubular products can be provided, but a larger lead time could be required. Data Sheet  Technical Question?  Get a Quote

Stainless 309

309 stainless steel has good strength and resistance to oxidation at high temperatures. This grade has better overall corrosion resistance than 304 stainless steel. Data Sheet  Technical Question?  Get a Quote

Stainless 309S

309S has lower carbon content than regular 309 and is recommended for applications where sensitization and subsequent corrosion by high temperature gases or condensates during shutdown may pose a problem. In some cases, tubular products may be dual certified to 309 and 309S. Data Sheet  Technical Question?  Get a Quote

Stainless 310

This grade combines excellent high temperature properties with good ductility. 310 stainless is designed for high temperature service applications. In most applications, 310 stainless resists oxidation at high temperatures.  Data Sheet  Technical Question?  Get a Quote

Stainless 310S

Stainless grade 310S calls for lower carbon content than standard 310 stainless. In many cases, 310 and 310S are dual certified. See full data sheet for comparison.  Data Sheet  Technical Question?  Get a Quote

Stainless 310H

Stainless steel grade 310H has higher carbon content and is often selected for high temperature applications. 310H is used in environments that produce sulfur dioxide gas at high temperatures.  Data Sheet  Technical Question?  Get a Quote

Stainless 321

321 Stainless Steel is an austenitic chromium-nickel stainless steel that contains titanium. This is best for use in welded parts that cannot be annealed. Data Sheet   Technical Question?  Get a Quote

Stainless 321H

321H grade stainless steel is the higher carbon version of grade 321. It possesses enhanced creep resistance and higher strength at temperatures above 10,000F (537°C). Usually, the plate’s carbon content allows dual certification. Data Sheet   Technical Question?  Get a Quote

Stainless 347

347 Stainless Steel is a stabilized austenitic stainless steel similar to type 304, but it also contains columbium and tantalum.  Data Sheet  Technical Question?  Get a Quote

Stainless 347H

347H Stainless Steel is a columbium-stabilized austenitic stainless steel plate. It has good general corrosion resistance, as well as slightly better resistance in strong oxidizing conditions than grade 321. Data Sheet   Technical Question?  Get a Quote

Hot-Finished Round Tubing Permissible Variations:

These tolerances apply to cut lengths up to an including 24 Ft. (7.3M). For lengths over 24Ft. an additional over tolerance of 1/8in (3.1mm) for each 10ft. (3m) or fraction thereof shall be permissible up to a maximum tolerance of 1/2 in. (12.7mm)

Specified Dimension, Outside Diameter

Ratio of Wall Thickness to Outside Diameter

Outside Diameter

Up To 0.109

0.109 to 0.172

Over 0.172 to 0.203

Over 0.203

Permissible Variations In Cut Length

Over Under Over Under Over Under Over Under Over Under Over Under
up to 3″ All Thickness 0.023 0.023 16.5 16.5 15 15 14 14 12.5 12.5 3/16 0
3″ to > 5.5″ All Thickness 0.031 0.031 16.5 16.5 15 15 14 14 12.5 12.5 3/16 0
5.5″ to > 8″ All Thickness 0.047 14 14 12.5 12.5 3/16 0
8″ to > 10.75″ 5% and Over 0.047 0.047 12.5 12.5 3/16 0
10.75″ to > 12.75″ Under 5% 0.063 0.063 12.5 12.5 3/16 0

Cold-Finished Round Tubing Permissible Variations:

  1. Tolerances of tubes produced by the rod or bar mandrel process and which have an inside diameter under 1/2 in (12.7mm) (or an inside diameter under 5/8 in. When the wall thickness is more then 20% of the outside diameter.) Are as shown in this table except that wall thickness tolerances are 10% over and under the specified wall thickness.
  2. For Ovality values, the tolerance for average outside diameter at any one cross section does not exceed the outside diameter tolerance value for the applicable outside diameter.
  3. Many tubes with wall thicknesses more then 25% of outside diameter or with wall thicknesses over 1 1/4 in. Or weighing more then 90lb/ft. are difficult to draw over a mandrel. Therefore the wall thickness can vary 12 1/2% over and under that specified.
  4. For those tubes with inside diameter under 1/2 in (or under 5/8 in when the wall thickness is more then 20% of the outside diameter) which are not commonly drawn over a mandrel, A is not applicable. Therefore the wall thickness can vary 15% over and under that specified, and the inside diameter is governed by both the outside diameter and wall thickness tolerances.
  5. These tolerances apply to cut lengths up to an including 24 ft. For lengths over 24ft, an additional over tolerance of 1/8 in. for each 10ft. or fraction thereof shall be permissible, up to a maximum tolerance of 1/2 in.

Outside Diameter, In.

Outside Diameter Tolerance, In. Over and Under

Ovality Double Outside Diameter Tolerance when wall is:

Wall Thickness in %

Permissible Variations in Cut Length, in.

Over Under Over Under
Under 1/2 0.005 Less than 0.015 In. 15 15 1/8 0
1/2 to 1-1/2 Excl. 0.005 Less than 0.065 In. 10 10 1/8 0
1 1/2 to 3 1/2, Excl 0.010 Less Than 0.095 In. 10 10 3/16 0
3 1/2 to 5 1/2 Excl 0.015 Less than 0.150 In. 10 10 3/16 0
5 1/2 to 8 Excl. 0.030 Less than 0.240 In. 10 10 3/16 0
8 to 8 5/8 Excl 0.045 Less than 0.300 In. 10 10 3/16 0
8 5/8 to 12 3/4 0.062 Less than 0.350 In. 10 10 3/16 0

Call us at 1-800-222-6144 for more information