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Stainless Steel Square Bar

Penn Stainless inventories stainless square bar from 3/16″ thru 4″ in 303, 304/L, 316/L, 410, 416, and 440C stainless. In many sizes, stainless square bar is available in our proprietary brand of machining bars: PennMet 2000. PennMet 2000 offer Superior machineability and lower cost machined parts. Our stainless bar processing equipment enables Penn Stainless to produce parts to our customers’ precise requirements.

Please review our Stainless Steel Bar page for a full overview of all of our stainless bar products, including hex bar and round bars, as well as our Stainless Steel

Images of Square Bar

Square Bar Product Overview

Stainless Steel Square Bar

Thickness Range of Stainless Plate


300 Series Stainless Steel Grades

304/304L - 316/316L Get a Quote

400 Series Stainless Steel Grades

410 - 416 Get a Quote

Inventory for Square Bar

  • X = Stocked Item
  • P = Call For availability square bar can be cut to size.
  • Square bar can be polished per customer specifications.
  • Square bar is stocked in Penn met 2000 for improved machinability.

Size in Inches

Wt per Ft

Wt per 12′





3/16″ 0.120 1.440 X X X P
1/4″ 0.210 2.52 X X X P
5/16″ 0.330 3.96 X X X X
3/8″ 0.480 5.76 X X X X
7/16″ 0.650 7.80 X X X X
1/2″ 0.850 10.20 X X X X
9/16″ 1.080 12.96 X X X X
5/8″ 1.330 15.96 X X X X
3/4″ 1.910 22.92 X X X X
7/8″ 2.610 31.32 X X X X
1″ 3.400 40.80 X X X X
1-1/8″ 4.310 51.72 X X X X
1-1/4″ 5.320 63.84 X X X X
1-3/8″ 6.400 76.80 X X X X
1-1/2″ 7.600 91.20 X X X X
1-3/4″ 10.400 124.80 X X X X
2″ 13.600 163.20 X X X X
2-1/4″ 17.200 206.40 X X X X
2-1/2″ 21.300 255.60 X X X X
3″ 30.63 367.56 X X X P
4″ 54.40 652.80 X X X P


For other sizes and grades, contact a Penn Stainless sales associate for availability and delivery


Customers can select a number of processing options to produce stainless steel bars to their exact specifications, reducing materiel costs, production time, scrap and internal handling.

 Long Product Processing Services Overview

Square Bar Cutting

Products cut include Round Bar, Flat bar, Hex bar, Square bar, Tubing and Hollow Bar, Pipe, Angles, channels, Beams and Tees.  Thickness range is 1/16″ to 28″ diameter More Information 

Square Bar Production Cutting

Penn Stainless can provide production cutting for product diameters up to 4″.  We utilize Amanda Production Equipment to achieve these precision cuts with tight tolerances. More Information

Square Bar Polishing

Products polished included all tubular products, with OD & ID polishing available, Round Bar, Square Bar, Hex & Flat bar, Angles, Uneven Leg Angles, beams, and other shapes. More Information

Value Added Resources for Square Bar

The following value added services can be provided by Penn Stainless Products in order to meet the exact specifications of your stainless steel bar requirements.

Stainless Steel Bar Value Added Options

Stainless Steel Bar Polishing

Penn Stainless can polish nearly any stainless steel bar item to a #4 polish, #6 Polish, #7 polish or a #8 mirror finish.  Stainless steel polished bar can also be cut to size. Pitt free surfaces can also be provided.

More Information

Technical Question?

Heatreating & Annealing

Some grades of stainless steel bars can be heatreated to change the mechanical properties. Precipitation Hardening Stainless Steels such as 17-4PH can be heatreated. 410 stainless steel bar can also be heatreated.  In some cases, secondary annealing 300 series stainless steel may be required depending on the application

More Information

Technical Question?

Positive Material Identification (PMI)

Penn Stainless can perform PMI testing in house for most stainless steel grades, or we can work with independent labs to complete PMI in order to meet customer specifications.

More Information

 Technical Question?

UT Testing

In some cases, UT testing of the stainless steel bar may be required. We can assist you with this requirement.

More Information

 Technical Question?
  •  Need 180 pieces of 1″ 316/L square bar cut to 2-1/16″ long? We can process this job in a few days with our Amada CM100CNC.
  • Rapid cut of round bar 5/8″ thru 4″ dia
  • Rapid cut of Square, Hex & Rectangular bars
  • Need 2 pieces of 17-4PH bar cut to 4-3/4″ x 6-1/2″ x 11″ long? We supply non standard bar items in most grades of stainless.
  • Square bar can be polished to a No. 4 No. 6 or with a mirror finish. Please specify the number of sides that require polishing.

Tolerances for Cold & Hot Square Bars

Cold Finished Square Bar Tolerances:

CF Tolerances



1/8″ to 5/16″ (exclusive) 0.000 0.002
5/16″ to 1/2″ (exclusive) 0.000 0.003
1/2″ to 1″ (inclusive) 0.000 0.004
over 1″ to 2″ (inclusive) 0.000 0.006
over 2″ to 3″ (inclusive) 0.000 0.008

Cold Finished Square Bar Straightness Tolerance:

CF: 1/16 inch in any 5 foot; but may not exceed 1/16 X (length in ft/5)


Hot Finished Square Bar Tolerances:

HF Tolerances



Out of Sq

Over 7/8″ to 1″ (inclusive) 0.009 0.009 0.013
Over 1″ to 1-1/8″ (inclusive) 0.010 0.010 0.015
Over 1-1/8″ to 1-1/4″ (inclusive) 0.011 0.011 0.016
Over 1-1/4″ to 1-3/8″ (inclusive) 0.012 0.012 0.018
Over 1-3/8″ to 1-1/2″ (inclusive) 0.014 0.014 0.021
Over 1-1/2″ to 2″ (inclusive) 1/64 1/64 0.023

Hot Finished Square Bar Straightness Tolerance:

HF: 1/8 inch in any 5 foot; but may not exceed 1/8 X (length in ft/5)

Specifications for Cold & Hot Square Bars

Below you will find a brief overview of a number of stainless steel bar specifications. If you do not see a specification listed, please contact us.

Stainless Steel Square Bar Specifications


This specification encompasses cold-finished or hot-finished bars, including rounds, squares, and hexagons, and hot-rolled or extruded shapes, such as angles, tees, and channels in the more commonly used types of stainless steels. More Information Technical Question?


This specification includes cold and hot finished stainless steel bars, including rounds, squares, and hexagons, and hot-rolled or extruded shapes such as angles, tees, and channels. More Information Technical Question?


This specification includes wrought stainless steel bars, shapes, forgings, and billets or other semi-finished materials, except wire, for forging. The materials are available in four types of conditions. More Information Technical Question?


 This specification includes cold or hot finished bars, which are suitable for machining processes. This specification includes rounds, squares, and hexagons, from common types of stainless free-machining steels.  More Information  Technical Question?


 This specification includes nickel alloy bar & wire, which can be produced in a solution-annealed condition, stabilized-annealed condition, or annealed condition. More Information Technical Question? 



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