Round Bars

Round, Hex & Square Bars for Machining

Round, hex and square bars in ferrous and non-ferrous grades — black, peeled, bright or polished — for machining and engineering.

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Metal round bars
ASTM A276 · A479h9 · h11
Bright, Black & PeeledFinish to suit your machining route
3 SectionsRound · Hex · Square
5 FinishesBlack · Peeled · Bright · Ground · Polished
MTCEN 10204 3.1 / 3.2
Heat No.Marked and traceable
Overview

Bar Stock That Machines the Way You Expect

For turned and machined parts, the grade, condition and straightness of the bar decide how well it cuts and how long it lasts.

We supply round, hex and square bars in stainless steel, carbon and alloy steel, nickel alloys, titanium, copper, brass and aluminium. Bars are ordered by grade, diameter or size, finish and length, and are supplied with their mill test certificate.

If your component needs free-machining behaviour, a particular heat treatment condition or a tight tolerance, tell us and we will confirm what is available.

  • Round, hex & square sections
  • Black, peeled, bright & polished
  • Tolerance grades on request
  • Cut-to-length on request
Product Range

Choose the Surface Condition for Your Process

The finish decides how much stock must be removed and how accurate the bar is as supplied.

01
Black Bars

Black Bars

Hot-rolled with a dark mill scale. The most economical bar, with allowance left for machining.

Best for Heavy machining, forging stock
02
Peeled Bars

Peeled Bars

Turned to remove the scale and surface defects, giving a clean, round bar.

Best for Precision turning
03
Bright Bars

Bright Bars

Cold-drawn or ground for a bright surface and close tolerance.

Best for High-volume automatic machining
04
Polished Bars

Polished Bars

Polished to a smooth, reflective surface for visible or sliding parts.

Best for Shafts, decorative work
Specifications

Common Specifications We Supply Against

Governing standards for each material family. Tell us the one on your purchase order.

Material / ProductSpecificationTypical GradesNotes
Stainless bars & shapesASTM A276 / ASME SA276304 · 304L · 316 · 316L · 321 · 410 · 420 · 431Annealed (Condition A) or strain hardened (B)
Stainless bars for pressure equipmentASTM A479304 · 316 · 321 · 347For boilers and pressure vessels
Free-machining stainlessASTM A582303Improved machinability
Carbon & alloy steel barsASTM A29 · A1081018 · 1045 · 4130 · 4140 · 8620Hot-wrought (A29) and cold-finished (A108)
Nickel alloy barsASTM B166 · B446 · B425Alloy 600 · 625 · 825Rod and bar
Titanium barsASTM B348Grade 2 · Grade 5Bars and billets
Copper & brass barsASTM B16 · B124C36000 · C11000 · C37700Free-cutting brass and forging rod
Aluminium barsASTM B2112024 · 6061 · 6063Rod, bar and wire

Sizes, lengths and tolerances follow the product specification. Availability depends on grade and size.

  • Grades we supply:
  • SS 304 / 304L
  • SS 316 / 316L
  • SS 321
  • SS 303
  • SS 410 / 420 / 431
  • SS 17-4 PH
  • Duplex 2205
  • EN8 / EN19
  • 4130 / 4140
  • Inconel 625
  • Monel 400
  • Titanium Gr 2
  • Brass
  • Copper
  • Aluminium 6061
Surface Finish

Bar Finishes at a Glance

Pick the finish by how much machining you plan to do.

FinishProcessTypical use
BlackHot rolled, as-scaledHeavy machining and forging.
PeeledTurned to remove scale and surface defectsClean surface, good accuracy for turning.
Bright (cold drawn)Drawn through a dieClose tolerance and bright surface; ready for machining.
GroundCentreless groundTight diameter tolerance and fine surface.
PolishedGround and polishedShafts, spindles and visible parts.
Applications

Where Round Bars Are Used

The industries that most often specify this product.

  • 01Precision Machining
  • 02Oil & Gas
  • 03Chemical & Pumps
  • 04Marine
  • 05Automotive
  • 06Food Equipment
  • 07Power
  • 08Construction
Enquiry Checklist

Six Details Make a Complete Enquiry

Send these with your request and we can quote without going back and forth.

  1. 1

    Material & grade

    For example SS 316, 4140, EN8 or brass C36000.

  2. 2

    Specification & condition

    ASTM / EN reference and heat treatment condition.

  3. 3

    Section & size

    Round diameter, hex across flats or square side, in mm.

  4. 4

    Finish & tolerance

    Black, peeled, bright or ground, and h-grade if needed.

  5. 5

    Length & quantity

    Random or cut length, and the total weight or pieces.

  6. 6

    Documents & testing

    MTC 3.1 or 3.2, PMI, UT or third-party inspection.

Certificates & Testing With Every Order

Mill test certificates to EN 10204 3.1 / 3.2, PMI, hydro and NDT testing, and third-party inspection can be arranged. Read how every order is checked.

Quality Policy
FAQ

Round Bars: Common Questions

Still have a question?

Our team can help you choose the right grade, size and specification.

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Black bar is hot rolled with its mill scale. Peeled bar has been turned to remove the scale and surface defects. Bright bar is cold-drawn or ground, giving a smooth surface and closer tolerance, so less machining is needed.

These are ISO tolerance grades for the bar diameter. The smaller the number, the tighter the allowed variation. h9 is tighter than h11. Bright bars are commonly supplied to h9, h10 or h11.

Grade 303 (ASTM A582) contains added sulphur to improve machinability and is the usual choice for high-speed turning. For better corrosion resistance, 304 or 316 can be machined with the right tooling, though at lower speeds.

Yes — bars are supplied with a mill test certificate. Ask for EN 10204 3.1 or 3.2, and mention PMI or ultrasonic testing if you need them. See our Quality Policy.