Bright Mild Steel Round Bar - EN3B Grade, 1" (25.4mm) Diameter x 11.81" (300mm) Long

A 1" (25.4mm) diameter EN3B grade bright mild steel round bar cut to 11.81" (300mm) long. Bright drawn for close dimensional tolerances and a smooth surface finish, suitable for turning, machining, and general fabrication on lathes and CNC equipment.

Material Specification

• Material: Mild steel, EN3B grade (070M20)
• Finish: Bright drawn
• Form: Round bar / round rod
• Diameter: 1" (25.4mm)
• Length: 11.81" (300mm)
• Weight: approx. 5.29 oz (150g)
• HS Code: 7318 15 90
• Country of origin: United Kingdom

Key Properties

• Bright drawn finish — improved dimensional accuracy and surface quality over hot-rolled
• Good machinability — machines cleanly on lathes and CNC equipment
• Weldable — suitable for MIG, TIG, and arc welding
• Case-hardenable — surface can be hardened for wear resistance
• Good ductility — can be bent and formed without cracking
• Close dimensional tolerances — suitable for precision turned parts
• Not recommended for high tensile, marine, or corrosive environments

Typical Applications

• Shafts, spindles, rollers, and axles
• Brackets, frames, and supports
• General turned and machined components
• Jigs, fixtures, and tooling
• DIY engineering, hobby machining, and fabrication

Frequently Asked Questions

What is EN3B mild steel?
EN3B (specification 070M20) is a low carbon bright mild steel grade widely used in general engineering and fabrication. It offers good machinability, weldability, and ductility, and can be case-hardened. It is one of the most common steel grades for turned and machined parts.

What is the difference between bright and black mild steel?
Bright mild steel is cold drawn to close tolerances with a smooth surface finish. Black mild steel is hot-rolled, has a rougher surface, and looser dimensional tolerances. Bright steel is preferred when dimensional accuracy and surface finish matter.

What size is this bar in inches?
This bar is exactly 1 inch (25.4mm) in diameter and 11.81 inches long. The 1 inch diameter is one of the most commonly stocked standard sizes in the EN3B range.

Can this be welded?
Yes. EN3B mild steel is readily weldable using MIG, TIG, and arc welding processes. Pre-heating is not normally required for thin sections.

Can EN3B be case hardened?
Yes. EN3B can be case hardened to improve surface wear resistance while retaining a tough core, making it suitable for lightly stressed components such as spindles and pins.

What diameter and length options are available?
We stock EN3B bright mild steel round bar in a wide range of diameters and cut lengths. See our full EN3B Steel Round Bar collection for all available sizes.