---
title: "EN19 Round Bar, 16 to 125 mm | Laxcon Steels"
source: "https://www.laxconsteels.com/products/hot-rolled-round-bars/en-19/"
description: "EN 19 alloy steel hot rolled round bar, made to order by Laxcon Steels, India: composition, equivalents, weight per metre and tolerances."
---
# EN 19 Round Bars

*[Home](https://www.laxconsteels.com/) > [Products](https://www.laxconsteels.com/products/) > [Hot Rolled Round Bars](https://www.laxconsteels.com/products/hot-rolled-round-bars/) > EN 19*

EN 19 hot rolled round bar is a chromium molybdenum through hardening steel used for shafts, axles, gears and spindles.

16 to 125 mm Alloy steel Made to order

## EN 19 hot rolled round bar

EN 19 hot rolled round bar is a chromium molybdenum engineering steel supplied as a rolled round section in 16 to 125 mm diameter. The same steel is designated 709M40 in BS 970, 42CrMo4 in EN 10083-3 and 4140 in ASTM A29 and ASTM A322. Its chromium and molybdenum raise hardenability, so the bar hardens through the middle of a medium section in an oil quench instead of only near the surface. A plain carbon grade such as EN 8 costs less but leaves a soft core at the same diameter. EN 24 adds nickel and holds its strength in heavier sections, so EN 19 is the usual choice while the section stays moderate and the part is machined from bar.

The bar is supplied annealed, normalised, or hardened and tempered to a BS 970 condition such as T, which sets tensile strength at 850 to 1000 MPa. Annealed bar machines freely, and each higher condition cuts more slowly and needs rigid tooling. The steel is magnetic and has no corrosion resistance, so finished parts are plated, painted or kept oiled. Welding calls for preheat and a temper afterwards, because the carbon and chromium harden the weld zone. Parts machined from this bar include drive shafts and axles, gears and pinions, hydraulic cylinder rods, and spindles and tie rods. Laxcon Steels rolls the bar to order, black, spot ground or fully ground.

Composition limits in weight percent are carbon 0.36 to 0.44, manganese 0.7 to 1.0, sulphur 0.05 maximum, phosphorus 0.05 maximum, silicon 0.1 to 0.35, chromium 0.9 to 1.2 and molybdenum 0.25 to 0.35.

## EN 19 hot rolled round bar supply conditions

| Property | Value |
| --- | --- |
| Size range | 16 mm - 125 mm (5/8" - 5") |
| Length | Up to 8 metres |
| Tolerances | EN10060 |
| Heat treatment | Soft annealing or normalising; oil or water quenching and tempering |
| Grade | EN 19 (EN19, 709M40, 42CrMo4, 4140) |
| Family | Alloy steel |
| Supply | Made to order in this grade; every published size of the form |

## Composition of EN 19

| Element | Symbol | Minimum % | Maximum % |
| --- | --- | --- | --- |
| Carbon | C | 0.36 | 0.44 |
| Manganese | Mn | 0.7 | 1.0 |
| Sulphur | S |  | 0.05 |
| Phosphorus | P |  | 0.05 |
| Silicon | Si | 0.1 | 0.35 |
| Chromium | Cr | 0.9 | 1.2 |
| Molybdenum | Mo | 0.25 | 0.35 |

Composition, weight percent, balance iron. From the Laxcon Steels grade reference.

## Equivalents of EN 19

| Standard | Designation |
| --- | --- |
| SAE | 4140 / 4142 |
| DIN | 42CrMo4 |

Equivalence means nearest counterpart, not identity: each standards body sets its own composition window, so the limits of the standard named on the order govern.

## Governing standards

| Property | Value |
| --- | --- |
| EN 10083-1 | Steels for quenching and tempering, part 1: general technical delivery conditions for the bars, rods and sections supplied for heat treatment. |
| EN 10083-3 | Steels for quenching and tempering, part 3: technical delivery conditions for alloy steels, 42CrMo4 and 34CrNiMo6 among them. |
| BS 970-1 | Wrought steels for mechanical and allied engineering purposes, part 1: the British numbering behind the EN and M designations and the R to Z heat treatment conditions. |
| ASTM A29/A29M | Steel bars, carbon and alloy, hot-wrought: general requirements for delivery, the base every carbon and alloy bar order inherits. |
| ASTM A322 | Steel bars, alloy, standard grades: the composition tables for the SAE alloy grades supplied as bar. |
| EN 10060 | Hot rolled round steel bars for general purposes: dimensions and tolerances on shape and dimensions. |
| 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 |
| --- | --- | --- |
| 16 | 1.58 | 633.5 |
| 17 | 1.78 | 561.2 |
| 18 | 2.00 | 500.6 |
| 19 | 2.23 | 449.3 |
| 20 | 2.47 | 405.5 |
| 21 | 2.72 | 367.8 |
| 22 | 2.98 | 335.1 |
| 23.2 | 3.32 | 301.3 |
| 24 | 3.55 | 281.6 |
| 25 | 3.85 | 259.5 |
| 26 | 4.17 | 239.9 |
| 27 | 4.49 | 222.5 |
| 28 | 4.83 | 206.9 |
| 30 | 5.55 | 180.2 |
| 32 | 6.31 | 158.4 |
| 34 | 7.13 | 140.3 |
| 36 | 7.99 | 125.1 |
| 37 | 8.44 | 118.5 |
| 38 | 8.90 | 112.3 |
| 40 | 9.87 | 101.4 |
| 42 | 10.88 | 91.9 |
| 45 | 12.49 | 80.1 |
| 47 | 13.62 | 73.4 |
| 48 | 14.21 | 70.4 |
| 50 | 15.41 | 64.9 |
| 53 | 17.32 | 57.7 |
| 56 | 19.34 | 51.7 |
| 57.5 | 20.39 | 49.1 |
| 60 | 22.20 | 45.1 |
| 63 | 24.47 | 40.9 |
| 66 | 26.86 | 37.2 |
| 67.5 | 28.09 | 35.6 |
| 70 | 30.21 | 33.1 |
| 73.5 | 33.31 | 30.0 |
| 75 | 34.68 | 28.8 |
| 77.5 | 37.03 | 27.0 |
| 80 | 39.46 | 25.3 |
| 83 | 42.48 | 23.5 |
| 85 | 44.55 | 22.4 |
| 88 | 47.75 | 20.9 |
| 90 | 49.94 | 20.0 |
| 93 | 53.33 | 18.8 |
| 95 | 55.65 | 18.0 |
| 98 | 59.22 | 16.9 |
| 100 | 61.66 | 16.2 |
| 105 | 67.98 | 14.7 |
| 106 | 69.28 | 14.4 |
| 110 | 74.61 | 13.4 |
| 115 | 81.54 | 12.3 |
| 120 | 88.79 | 11.3 |
| 125 | 96.34 | 10.4 |

Density 7.85 g/cm³, diameter squared x 0.006166. Sizes are the published range at the nominal diameters shown.

## Ordering EN 19 hot rolled round bar

An enquiry for this grade in this form states the grade with its governing standard, EN 19 to BS 970 or 42CrMo4 to EN 10083-3, the condition required, the diameter with the tolerance standard and class to EN 10060 or ASTM A484, the length, the quantity, the surface wanted, and the test certificate type to EN 10204. Ultrasonic testing and PMI confirmation of the grade are stated in the same place.

## Other grades in Round Bars

- [**AISI 304** The general purpose austenitic stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-304/)
- [**AISI 316** The molybdenum-bearing austenitic grade](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-316/)
- [**EN 8** A medium-carbon unalloyed engineering steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/en-8/)
- [**Duplex 2205** The standard duplex stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/duplex-2205/)
- [**SAE 4140** The chromium-molybdenum through-hardening steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/sae-4140/)
- [**AISI 303** The free-machining austenitic grade](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-303/)
- [**AISI 316L** The low-carbon version of AISI 316](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-316l/)
- [**AISI 410** The basic martensitic stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-410/)
- [**SAE 4340** The nickel-chromium-molybdenum through-hardening steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/sae-4340/)
- [**AISI 416** The free-machining martensitic grade](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-416/)
- [**17-4 PH** The precipitation hardening stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/17-4-ph/)
- [**AISI 420** A higher-carbon martensitic stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-420/)
- [**AISI 431** A martensitic stainless steel with nickel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-431/)
- [**AISI 304L** The low-carbon version of AISI 304](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-304l/)
- [**AISI 430** The standard ferritic stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-430/)
- [**EN 24** A nickel-chromium-molybdenum engineering steel for heavy sections](https://www.laxconsteels.com/products/hot-rolled-round-bars/en-24/)
- [**Super duplex 2507** A super duplex stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/super-duplex-2507/)
- [**AISI 310S** A high-chromium, high-nickel austenitic grade for continuous service](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-310s/)
- [**AISI 321** AISI 304 stabilised with titanium](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-321/)

[Hot Rolled Round Bars: every size](https://www.laxconsteels.com/products/hot-rolled-round-bars/) [EN 19 composition and equivalents](https://www.laxconsteels.com/grades/en-19/) [Weight calculator](https://www.laxconsteels.com/weight-calculator/) [Send the RFQ](https://www.laxconsteels.com/contact/?product=hot-rolled-round-bars)