EN 10025-2 · Structural carbon steel

Black Mild Steel Square Bar 40mm Mill Finish S275JR - Excellent Weldability, Machinability, 12.6kg/M, Poor Corrosion Resistance, Linear Metre

40 mmMill Finish3000mm length

PhotoBlack Mild Steel Square Bar 40mm Mill Finish S275JR - Excellent Weldability, Machinability, 12.6kg/M, Poor Corrosion Resistance, Linear Metre 40 mm – photo 1 of 1
End profile

40 mm

  • Poor corrosion resistance
  • Excellent weldability

£263.76incl. VATper 3000mm length

Quantity 1 = one 3000mm length.

LengthSupplied as one length

Item total £263.76 1 × £263.76 per 3000mm length

Secure checkout: Card, Apple Pay, Google Pay or Shop Pay

Availability
Available to order
Delivery
UK only. Flat £20 delivery per order. Handling 1–2 working days, then 2–4 working days in transit. Delivery information
Returns
Return within 14 days of receipt. Returns policy
Overview

Overview

About this mild steel square bar

Black Mild Steel Square Bar, made from S275JR grade mild steel, offers excellent weldability, formability, and machinability. With dimensions of 30mm in height, thickness, and width, it provides consistent and reliable measurements for various applications. Although it has poor corrosion resistance, its mill finish and structural grade properties make it a versatile choice for construction, fabrication, and manufacturing projects. 

  • Material: Mild Steel, known for its durability, tensile strength, and cost-effectiveness
  • Weldability: Excellent, ideal for various welding techniques, ensuring strong and reliable joints
  • Formability: Excellent, can be easily shaped, bent, or formed without cracking
  • Size: Metric 40mm, precise and consistent measurements for reliable applications
  • Machinability: Excellent, suitable for turning, drilling, milling, and other machining processes
  • Shape: Square Bar, versatile shape used in construction, fabrication, and manufacturing
  • Corrosion Resistance: Poor, may require additional coating or painting to prevent rust and corrosion
  • Finish: Mill Finish, standard industrial finish with a slightly rough texture
  • Grade: S275JR, a structural grade with good mechanical properties, including a minimum yield strength of 275 MPa
  • Weight per Metre: 12.6 kg, calculated for precise weight management in construction and fabrication projects

Specifications

Maximum Cut Length 6 Metres
Material Mild Steel
Weldability Excellent
Formability Excellent
Size Metric 40mm
Machinability Excellent
Shape Square Bar
Corrosion Resistance Poor
Finish Mill Finish
Grade S275JR
Height 40mm
Thickness 40mm
Width 40mm
Weight/Metre (Kg) 12.6

Key features

  • Grade S275JR (EN 10025-2, structural carbon steel)
  • Poor corrosion resistance
  • Excellent weldability
FAQs

FAQs

Before you order

What does one unit of this item supply?

Quantity 1 = one 3000mm length.

Can you supply other sizes or a cutting list?

Yes — send the sizes and lengths you need with Request a quote, or call 01744 520110.

Specifications

Specifications

Product dimensions

Dimensions and supply details for this mild steel square bar
Size40 mm
Supplied length3000mm
Weight12.6 kg/m
FinishMill Finish
GradeS275JR
SKUM4U-2808-3000mm

Material properties

Material properties
MaterialMild Steel
WeldabilityExcellent
FormabilityExcellent
Size Metric40mm
MachinabilityExcellent
ShapeSquare Bar
Corrosion ResistancePoor
Height40mm
Thickness40mm
Width40mm

Catalogue name Black Mild Steel Square Bar 40mm Mill Finish S275JR - Excellent Weldability, Machinability, 12.6kg/M, Poor Corrosion Resistance, Linear Metre

Technical data (EN 10025-2)

Technical data · alloy

S275JR / EN 10025-2

  • C ≤0.25%Carbon
  • Mn ≤1.5%Manganese
  • Fe BalanceIron
Alloy
Structural carbon steel
Designation
EN 10025-2
Density
7.85 g/cm³

Typical composition for the grade, for guidance — not a mill certificate for this item.

Request a quote

Need several sizes, long runs or a cert?

Black Mild Steel Square Bar 40mm Mill Finish S275JR - Excellent Weldability, Machinability, 12.6kg/M, Poor Corrosion Resistance, Linear Metre 40 mmMill Finish3000mm£263.76 per 3000mm length

Send us your cutting list or question. We reply with prices and availability for your full list.

Fields marked with an asterisk are required.

One line per item: quantity × size × cut length.
Example: 4 × 25.4 mm OD × 1.6 mm wall tube @ 600 mm