---
title: "Stainless Steel Round Bars, Black and Bright, 5-550 mm"
source: "https://www.laxconsteels.com/products/stainless-steel-round-bars/"
description: "Stainless steel round bars 5 mm to 550 mm: hot rolled, bright, precision shaft quality and proof machined. Melted and finished by Laxcon Steels, India."
---
# Stainless Steel Round Bars

Stainless steel round bar, 5 mm to 550 mm, supplied hot rolled, bright, precision shaft quality or proof machined

5 mm - 550 mm Up to 8 metres ASTM A484, EN 10060, h7 to k13 [REQUEST A QUOTE](https://www.laxconsteels.com/contact/?product=stainless-steel-round-bars#form)

## Product Description

Stainless steel round bar is bar of circular cross-section, ordered by its diameter. Laxcon Steels supplies round bar from 5 mm to 550 mm in four finishes, from steel melted in its own melting shop: [hot rolled round bar](https://www.laxconsteels.com/products/hot-rolled-round-bars/) from 16 mm to 125 mm, [bright bar](https://www.laxconsteels.com/products/bright-bars/) from 5 mm to 115 mm, [precision shaft quality bar](https://www.laxconsteels.com/products/precision-shaft-quality-psq-bars/) from 8 mm to 81 mm and [proof machined bar](https://www.laxconsteels.com/products/forged-proof-machined-bars/) from 120 mm to 550 mm.

The finish fixes the tolerance and the surface. Hot rolled bar keeps the rolled surface and is held to ASTM A484 or EN 10060. Bright bar is cold drawn, peeled, turned or ground to h7, h8, h9, h10, h11, k12 or k13, with a surface finish down to Ra 0.2 micron and straightness up to 0.5 mm per metre. Precision shaft quality bar is ground and polished to h7, h8, h9, j6, f7 or f8, with straightness of 0.015 inch total indicator reading per 10 feet. Proof machined bar is rough turned below the outer skin, so the surface is proven free of defects before the customer's final machining.

Weight per metre by diameter is in the [round bar weight chart](https://www.laxconsteels.com/weight-charts/#round-bar-weight-chart), and grade chemistry is in the [grade reference](https://www.laxconsteels.com/grades/). Grade, finish and tolerance are compared for a round bar order in the [round bar buyer's guide](https://www.laxconsteels.com/choosing-the-right-stainless-steel-round-bar-a-guidebook-for-buyers-in-india/).

![Stainless steel round bars produced by Laxcon Steels](https://www.laxconsteels.com/images/products/stainless-steel-hot-rolled-round-bars.webp)

## Round Bars Supply Conditions

| Property | Value |
| --- | --- |
| Size range | 5 mm - 550 mm (3/16" - 21-2/3") |
| Length | Up to 8 metres hot rolled, 6.5 metres bright, 6.4 metres precision shaft quality, 6 metres proof machined |
| Surface | Hot rolled (black), spot ground or fully ground; cold drawn, centreless ground, peeled and polished, rough peeled or smooth turned; proof machined |
| Tolerances | ASTM A484, EN 10060; h7, h8, h9, h10, h11, k12, k13; j6, f7, f8 |
| Straightness | Up to 0.5 mm per metre bright; 0.015” TIR per 10 ft. precision shaft quality |
| Heat treatment | Soft Annealing, Solution Annealing, Spheroidized Annealing, Normalizing, Oil and Water Quenching, Tempering, Aging |
| Bars End Finish | Bright bar: Chamfered ends, 30°, 45°, 60° and Plain Ends without Burrs or Sharp Edges |

- 100% Ultrasonically Tested hot rolled bar; ultrasonic tested proof machined bar
- Eddy current tested bright and precision shaft quality bar as per customer’s requirement
- Free from Radioactive elements, Mercury & Lead contamination
- Grade confirmation through PMI testing with Handheld Spectrometers
- Weight per metre for every listed size: [metal weight calculator](https://www.laxconsteels.com/weight-calculator/)

## Size Range by Finish

| Finish | Size range | Length | Tolerance | Inch range |
| --- | --- | --- | --- | --- |
| [Hot Rolled Round Bars](https://www.laxconsteels.com/products/hot-rolled-round-bars/) | 16 mm to 125 mm | Up to 8 m | ASTM A484, EN 10060 | 5/8" - 5" |
| [Bright Bars](https://www.laxconsteels.com/products/bright-bars/) | 5 mm to 115 mm | Up to 6.5 m | h7, h8, h9, h10, h11, k12, k13, ASTM A484 | 3/16" - 4-1/2" |
| [Precision Shaft Quality (PSQ) Bars](https://www.laxconsteels.com/products/precision-shaft-quality-psq-bars/) | 8 mm to 81 mm | Up to 6.4 m | h7, h8, h9, j6, f7, f8 | 5/16" - 3-3/16" |
| [Forged & Proof Machined Bars](https://www.laxconsteels.com/products/forged-proof-machined-bars/) | 120 mm to 550 mm | Up to 6 m | ASTM A484, EN 10060 | 4-3/4" - 21-2/3" |

## Governing standards

| Property | Value |
| --- | --- |
| EN 10088-3 | Stainless steels: technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products for general purposes. Composition, heat treatment condition and mechanical properties per grade. |
| EN 10060 | Hot rolled round steel bars for general purposes: dimensions and tolerances on shape and dimensions. |
| EN 10278 | Dimensions and tolerances of bright steel products: the h and k tolerance classes for drawn, turned, peeled and ground bars. |
| ASTM A276/A276M | Stainless steel bars and shapes: composition, condition, mechanical properties and finish designations for hot-finished and cold-finished bar. |
| ASTM A484/A484M | General requirements for stainless steel bars, billets and forgings: permissible variations in dimensions, straightness, weight and length, and the test and marking requirements every bar order inherits. |
| ASTM A479/A479M | Stainless steel bars and shapes for use in boilers and other pressure vessels: the bar specification a pressure-part drawing calls for. |
| ASTM A314 | Stainless steel billets and bars for forging. |
| ASTM A473 | Stainless steel forgings. |
| ISO 286-1 and 286-2 | The ISO code system for tolerances on linear sizes: the IT grades and the fundamental deviations behind h7, h9, h11, k12, k13, j6, f7 and f8. |
| NACE MR0175 / ISO 15156 | Materials for use in H2S-containing environments in oil and gas production: the sour-service limits on hardness and condition. |
| EN 10204 | Metallic products, types of inspection documents: the 2.2 test report and the 3.1 and 3.2 inspection certificates a purchase order can call for. |

## Weight per metre

| Diameter (mm) | kg per metre | Metres per tonne |
| --- | --- | --- |
| 5 | 0.16 | 6,446.4 |
| 6 | 0.22 | 4,476.7 |
| 8 | 0.40 | 2,518.1 |
| 10 | 0.62 | 1,611.6 |
| 12 | 0.89 | 1,119.2 |
| 16 | 1.59 | 629.5 |
| 20 | 2.48 | 402.9 |
| 25 | 3.88 | 257.9 |
| 32 | 6.35 | 157.4 |
| 40 | 9.93 | 100.7 |
| 50 | 15.51 | 64.5 |
| 63 | 24.63 | 40.6 |
| 80 | 39.71 | 25.2 |
| 100 | 62.05 | 16.1 |
| 115 | 82.06 | 12.2 |
| 120 | 89.35 | 11.2 |
| 125 | 96.95 | 10.3 |
| 150 | 139.61 | 7.2 |
| 200 | 248.20 | 4.0 |
| 250 | 387.81 | 2.6 |
| 300 | 558.45 | 1.8 |
| 350 | 760.11 | 1.3 |
| 400 | 992.80 | 1.0 |
| 450 | 1,256.51 | 0.8 |
| 500 | 1,551.25 | 0.6 |
| 550 | 1,877.01 | 0.5 |

Density 7.90 g/cm³ (d² x 0.006205). A 304 bar at 7.93 g/cm³ runs 0.4 percent heavier, a 316 bar at 7.98 g/cm³ 1 percent heavier. Sizes are the published range at the nominal diameters shown.

## Uses

Hot rolled round bar is the starting stock for machined parts such as shafts, gears and axles in heavy trucks, agricultural equipment and the [automotive industry](https://www.laxconsteels.com/industries/), and for the cold finishing lines that make bright bar. Precision shaft quality bar is used for pump shafts, cylinder shafts, boat shafts, piston shafts, valve shafts and bearing bars. Proof machined bar covers the large diameters, 120 mm to 550 mm, that are forged rather than rolled, for large shafts and pressure parts.

Where the customer removes every surface in machining, the hot rolled bar at EN 10060 or ASTM A484 tolerance is the lowest-cost route. A bright bar goes into a lathe, a grinder or a bearing seat with no preparatory cut. A precision shaft quality bar is finished to a fit, a straightness and a stated minimum yield, because it rotates in service.

## Grades

Round bar is supplied in the [ferritic](https://www.laxconsteels.com/grades/ferritic/), [austenitic](https://www.laxconsteels.com/grades/austenitic/), [duplex](https://www.laxconsteels.com/grades/duplex/), [precipitation hardening](https://www.laxconsteels.com/grades/precipitation-hardening/) and [martensitic](https://www.laxconsteels.com/grades/martensitic/) families set out in the grade reference, and in alloy and carbon steels such as SAE 4140, SAE 4340, EN 8, EN 19 and EN 24. The grades rolled for a given size are confirmed at enquiry. Composition, equivalents and standards for the grades most often ordered as round bar are on the grade pages listed under the questions below.

## Frequently Asked Questions

### What stainless steel round bar sizes does Laxcon publish?

Laxcon publishes stainless steel round bars from 5 mm to 550 mm diameter. Bright bars run from 5 mm to 115 mm, hot rolled bars from 16 mm to 125 mm, precision shaft quality bars from 8 mm to 81 mm and proof machined bars from 120 mm to 550 mm.

### Which lengths are stainless steel round bars supplied in?

Hot rolled round bars are supplied in lengths up to 8 metres, bright bars up to 6.5 metres, precision shaft quality bars up to 6.4 metres and proof machined bars up to 6 metres.

### Which tolerances apply to stainless steel round bars?

Hot rolled and proof machined round bars are supplied to ASTM A484 or EN 10060. Bright bars are supplied to h7, h8, h9, h10, h11, k12, k13 or ASTM A484, and precision shaft quality bars to h7, h8, h9, j6, f7 or f8.

### How are stainless steel round bars tested?

Every hot rolled round bar is ultrasonically tested, and proof machined bars are ultrasonically tested through the machined surface. Eddy current testing is carried out on bright and precision shaft quality bars where the order calls for it, and positive material identification with a handheld spectrometer confirms the grade.

### How can stainless steel round bars be packed and traced?

Laxcon packs stainless steel round bars in standard bundles of 500 to 1,000 kg with HDPE or LDPE wrapping and two lifting slings. ISPM 15 wooden boxes and fibre-tube packing are available, precision shaft quality bar is packed with distance rings in plywood boxes, and every bundle is marked with heat number, grade, size, and net and gross weight.

[Search 500+ grades](https://www.laxconsteels.com/grades/) [Compare equivalents](https://www.laxconsteels.com/grades/equivalents/) [Check weight charts](https://www.laxconsteels.com/weight-charts/) [Review quality](https://www.laxconsteels.com/quality/) [Send the RFQ](https://www.laxconsteels.com/contact/?product=stainless-steel-round-bars) Hot Rolled Round Bars [AISI 304](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-304/) [AISI 316](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-316/) [EN 8](https://www.laxconsteels.com/products/hot-rolled-round-bars/en-8/) [Duplex 2205](https://www.laxconsteels.com/products/hot-rolled-round-bars/duplex-2205/) [SAE 4140](https://www.laxconsteels.com/products/hot-rolled-round-bars/sae-4140/) [AISI 303](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-303/) [AISI 316L](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-316l/) [AISI 410](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-410/) [SAE 4340](https://www.laxconsteels.com/products/hot-rolled-round-bars/sae-4340/) [AISI 416](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-416/) [17-4 PH](https://www.laxconsteels.com/products/hot-rolled-round-bars/17-4-ph/) [AISI 420](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-420/) [AISI 431](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-431/) [AISI 304L](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-304l/) [AISI 430](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-430/) [EN 24](https://www.laxconsteels.com/products/hot-rolled-round-bars/en-24/) [Super duplex 2507](https://www.laxconsteels.com/products/hot-rolled-round-bars/super-duplex-2507/) [AISI 310S](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-310s/) [AISI 321](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-321/) [EN 19](https://www.laxconsteels.com/products/hot-rolled-round-bars/en-19/) Bright Bars [EN 8](https://www.laxconsteels.com/products/bright-bars/en-8/)

## Round Bar Finishes

### [Hot Rolled Round Bars](https://www.laxconsteels.com/products/hot-rolled-round-bars/)

### [Bright Bars](https://www.laxconsteels.com/products/bright-bars/)

### [Precision Shaft Quality (PSQ) Bars](https://www.laxconsteels.com/products/precision-shaft-quality-psq-bars/)

### [Forged & Proof Machined Bars](https://www.laxconsteels.com/products/forged-proof-machined-bars/)