EN 8M Free Cutting Steel
We are EN 8M Free Cutting Steel Manufacturers, Suppliers, and Exporters in Mumbai, India. STEEL MART is an ISO 9001:2015 certified company established in 1986, with decades of experience in supplying high-quality free-cutting steel products to various industries. We specialize in manufacturing and supplying EN 8M Free Cutting Steels (BS 970 212M40 / EN8M / AISI 1141 / SAE 1141 / 40SMn28 / W.Nr 1.0726) that meet national and international quality standards for high-tensile turned shafts, drive axles, high-stress gears, studs, bolts, and precision CNC components. EN 8M Free Cutting Steel is a resulphurized medium carbon engineering steel specified under British Standards (BS 970) for applications requiring high tensile strength combined with superior high-speed machining performance. Formulated with 0.35–0.45% Carbon, 1.00–1.40% Manganese, and elevated Sulphur (0.12–0.20%), EN 8M forms well-dispersed Manganese Sulphide (MnS) inclusions that act as internal chip breakers. This chemical balance reduces tool edge friction, lowers cutting forces, and permits significantly higher CNC lathe turning speeds compared to standard plain carbon EN 8. In cold drawn (+C) or normalized condition, EN 8M provides excellent bar straightness, tight h9/h10 tolerances, and high yield strength (380–520 MPa). It also responds exceptionally well to induction hardening (50–55 HRC) or conventional quench and temper (+QT) heat treatments. Because of its outstanding strength-to-machinability ratio, EN 8M Steel is widely specified across automotive drive axles, hydraulic cylinder rods, high-tensile studs, machine tool spindles, and agricultural machinery spares.
Our EN 8M Free Cutting Steels are 100% Prime – Tested & Guaranteed, ensuring precise chemical composition, dimensional accuracy, and consistent machinability. Each product is supplied with proper Mill Test Certificates (MTC) confirming compliance with BS 970 / EN 10087 standards with EN 10204 3.1 certification. STEEL MART follows strict quality control procedures and ensures timely delivery.
What is EN 8M Free Cutting Steel?
EN 8M Free Cutting Steel (BS 970 212M40 / EN8M / AISI 1141 / SAE 1141 / 40SMn28 / W.Nr 1.0726) is a resulphurized medium carbon free-machining engineering steel specified under British Standards (BS 970) for high-stress turned components requiring superior machinability and high mechanical strength. Formulated with 0.35–0.45% Carbon, 1.00–1.40% Manganese, and elevated Sulphur (0.12–0.20%), EN 8M combines 0.40% carbon strength with excellent chip breaking capabilities. The Manganese Sulphide (MnS) inclusions break chips cleanly during high-rpm turning, drilling, and thread milling, extending tool insert life and lowering machine power consumption. In cold drawn supply condition (+C), EN 8M delivers tight dimensional tolerances, high bar straightness, and yield strength (380–520 MPa). It can also be heat treated (quenched and tempered or induction hardened to 50–55 HRC) to achieve enhanced core toughness and wear resistance. It is widely specified for automotive drive axles, hydraulic cylinder rods, high-tensile studs, machine tool spindles, gear shafts, and high-volume turned parts.
85% Machinability
Resulphurized structure enables fast CNC turning & extended tool insert life.
550–750 MPa Tensile
Superior mechanical strength compared to low carbon free-cutting steels.
0.12–0.20% Sulphur
Elevated sulphur and manganese form MnS inclusions for clean chip fragmentation.
50–55 HRC Hardness
Responds to localized induction hardening for high wear resistance on journals & pins.
Cold Drawn (+C)
Provides bright surface finish, high bar straightness, & tight h9/h10 tolerances.
High Stress Fasteners
Ideal choice for automotive drive axles, hydraulic rods, high-tensile studs, & gears.
Why Choose STEEL MART for EN 8M Free Cutting Steel
STEEL MART is the preferred choice for purchasing EN 8M Free Cutting Steel due to its strong reputation for quality and reliability. With over 40 years of experience in the steel industry, the company ensures that every product meets strict industry standards. The company follows strict quality inspection procedures to ensure that every EN 8M Steel product meets international standards.
Each product is carefully tested to ensure durability, strength, and performance. Customers trust STEEL MART for consistent quality, competitive pricing, and timely delivery. The company maintains a large inventory to meet urgent and bulk requirements efficiently. In addition to EN 8M Free Cutting Steels, STEEL MART also supplies a wide range of resulphurized, alloy steel, and carbon steel products for various industrial applications.
Chemical Composition of EN 8M Free Cutting Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.35 – 0.45 % |
| Manganese (Mn) | 1.00 – 1.40 % |
| Sulphur (S) | 0.12 – 0.20 % |
| Silicon (Si) | 0.10 – 0.35 % |
| Phosphorus (P) | 0.050 % Max |
Medium Carbon (0.35-0.45%) and elevated Sulphur (0.12-0.20%) combine to deliver high strength and fast machining.
Equivalent Grades of EN 8M Free Cutting Steel
| Standard | Equivalent Grade |
|---|---|
| BS 970 | 212M40 / EN8M |
| DIN / EN | 40SMn28 / 1.0726 |
| AISI / SAE | AISI 1141 / SAE 1141 |
| JIS | SUM42 |
| ISO | 40SMn28 |
These international equivalents ensure global engineering specification compatibility.
Mechanical Properties of EN 8M Free Cutting Steel (Cold Drawn)
The mechanical properties of EN 8M Free Cutting Steels make them ideal for automotive drive axles, hydraulic cylinder rods, high-tensile studs, and machine spindles. In cold drawn condition (+C), EN 8M delivers high tensile strength and uniform hardness.
Manufacturing & Processing of EN 8M Free Cutting Steel
EN 8M Free Cutting Steel bars undergo controlled hot rolling, descaling, precision cold drawing (+C), and optional heat treatment to achieve optimal mechanical properties.
Hot Rolling (1050°C - 1150°C)
Hot worked with controlled sulphur addition to ensure uniform MnS inclusion distribution.
Shot Blasting & Descaling
Surface descaling to remove oxide scale prior to cold drawing operations.
Precision Cold Drawing (+C)
Drawn through carbide dies to elevate yield strength and establish h9 / h10 bar tolerances.
Induction / Quench & Temper (+QT)
Quenched & tempered or induction hardened to achieve surface case hardness up to 50–55 HRC.
EN 8M Industry Applications
EN 8M Free Cutting Steels are widely used across Automotive Drive Axles, High-Tensile Studs, Hydraulic Cylinder Rods, Machine Spindles, and Gears.
Automotive Drive Axles & Shafts
Heavy-duty drive shafts, axle shafts, steering knuckles, & transmission spindles.
High-Tensile Studs & Bolts
High-strength turned studs, cylinder head bolts, wheel studs, & tie rods.
Hydraulic Cylinder Rods & Pins
Hydraulic piston rods, linkage pins, clevis pins, & high-pressure fitting adaptors.
High-Stress Gears & Sprockets
High-rpm drive pinions, spur gears, chain sprockets, & splined shafts.
Machine Tool Spindles
Lathe spindles, milling arbor shafts, indexing pins, & precision guide rods.
Agricultural & Mining Machinery
Tractor PTO shafts, excavator pins, harvester shafts, & heavy implement spares.
Availability and Customization
At STEEL MART, we supply EN 8M Free Cutting Steels in a wide range of sizes and specifications.
| Profiles Available | Round Bars, Hexagon Bars, Square Bars, & Flat Bars |
| Diameter / Size | Round: 5 mm to 250 mm | Hex: 6 mm to 75 mm AF | Square: 6 mm to 100 mm |
| Condition | Supplied in Cold Drawn (+C), Normalized, or Quenched & Tempered (+QT) condition |
| Length | Standard lengths from 3 meters to 6 meters |
| Tolerances | h9, h10, or h11 precision drawn tolerance per ISO / DIN 175 |
| Customization | Band-saw cut-to-length and chamfered bar ends available upon request |
| Certification | Supplied with 100% Prime Mill Test Certificate (EN 10204 3.1) |
Our strict quality control ensures consistent chemical composition and machining performance.
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EN 8M Free Cutting Steel (BS 970 212M40 / EN8M / AISI 1141 / SAE 1141 / 40SMn28 / W.Nr 1.0726) is a premier resulphurized medium carbon engineering steel widely specified across automotive drive axles, hydraulic cylinder rods, high-tensile studs, machine tool spindles, and high-stress gears. Combining 0.40% carbon strength (tensile 550–750 MPa), 85% machinability rating, excellent chip breaking capabilities, and induction hardening response (50–55 HRC), it provides superior performance for high-speed CNC turned components demanding mechanical strength. Supplied by STEEL MART with strict quality inspection and full EN 10204 3.1 Mill Test Certification, EN 8M Steel is an outstanding high-strength free-cutting grade.
Frequently Asked Questions
Common answers regarding EN 8M Free Cutting Steel specifications and parameters.
EN 8M contains 0.35–0.45% Carbon, 1.00–1.40% Manganese, 0.12–0.20% Sulphur, 0.10–0.35% Silicon, and max 0.050% Phosphorus.
EN 8M contains higher manganese (1.00–1.40%) and elevated sulphur (0.12–0.20%) compared to plain EN 8, providing significantly better chip breaking and higher CNC machining speeds while maintaining equivalent tensile strength.
EN 8M (BS 970 212M40) is equivalent to American AISI 1141 / SAE 1141 and European 40SMn28 (W.Nr 1.0726), offering matching resulphurized medium carbon chemistry and mechanical performance.
Automotive drive axles, hydraulic cylinder piston rods, high-tensile turned studs, machine tool spindles, gear blanks, and agricultural machinery components.
STEEL MART supplies EN 8M in round bars, hexagon bars, square bars, and flat bars in Cold Drawn (+C), Normalized, or Quenched & Tempered (+QT) condition with EN 10204 3.1 mill test certificates.