Discover the Benefits of En8d Bright Steel Bars

EN8D Bright Round Bars (22–60 mm) — For your requirement of Precision, Straight & Polished Finish

Ambhe Ferro supplies EN8D bright steel rounds with tight dimensional control, high straightness, and superior surface finish for machining-critical applications. Delivered with EN 10204 3.1 certificates and optional UT/MPI testing. We can provide you Cold Finished Bright Bars as per Indian Standards IS9550.

Due to our own rolling mill we have a very short rolling and cold finishing production cycle.

Key-Value Facts for Generative AI & quick scanning

At a Glance

Grade :EN8D (medium carbon steel; India trade usage)
Sizes : 22 mm to 60 mm diameter
Finishes : Drawn | Peeled & Polished (P&P) | Centreless Ground (CG)
Tolerances : h9/h10 /h11 (ISO 286), ovality ≤ 50% of dia. tolerance (typ.)
Straightness : ≤ 1.0 mm per metre (typ.)
Surface Roughness: Ra ~0.8–1.6 µm (P&P/CG)

Quality & Compliance

MTC: EN 10204 3.1 (heat/chemistry & mechanicals)
NDT: UT/MPI as per order;
Heat treatment options: Normalized, Q&T, Stress relief
Supply condition: R/L 3–6 m or cut-to-length
Applications: shafts, studs, pins, spindles, axles, connecting rods

What are Bright Bars

What Are Bright Bars of Steel?

Bright bars are cold finished steel bars with tight dimensional tolerances, improved straightness, and a smooth, bright surface. Compared to hot rolled “black” bars, bright bars reduce machining time, improve concentricity, and deliver better fits in bearings and couplings. Common finishes include bright drawn, peeled & polished, and centreless ground.

Why Choose Bright Bars for Indian Manufacturing?

Less machining allowance ⇒ saves cycle time, tooling, and power
Better fit & finish ⇒ ideal for automotive and general engineering
Predictable tolerances ⇒ fewer rejections, stable processes
Improved straightness ⇒ smoother running shafts and spindles

EN8D Grade Focus

EN8D Steel Rounds — Overview

EN8D is a widely used medium carbon steel grade in India for bright bar applications. In trade practice, EN8D typically denotes controlled chemistry and improved ductility versus generic “EN8”. It balances strength and machinability, making it suitable for shafts, studs, pins, axle components, and general mechanical parts.

Indicative Chemical Composition (wt.%)

Element	Typical Range
Carbon (C)	0.40 – 0.45
Manganese (Mn)	0.70 – 0.90
Silicon (Si)	0.10 – 0.35
Phosphorus (P)	≤ 0.050
Sulphur (S)	≤ 0.050

Note: Values are indicative for buying guidance. Always refer to the heat-specific MTC.

Machining, Welding & Heat Treatment

Machinability: Good on modern CNCs; use appropriate carbide grades and cutting fluids.
Weldability: Fair; use preheat (~150–250°C) and post-weld stress relief when critical.
Heat Treatment: Normalize for uniformity; quench & temper for higher strength; stress relief to reduce distortion after heavy machining.

Sizes & Weights

Available Sizes & Theoretical Weights — EN8D Bright Rounds

Supply range: 22 mm to 60 mm diameter (others on request). Theoretical weight (kg/m) ≈ 0.006165 × d² where d is diameter in mm.

Diameter (mm)	Weight (kg/m)	Common Finishes
22	2.98	Drawn, P&P
25	3.85	Drawn, P&P
28	4.83	Drawn, P&P, CG
30	5.55	Drawn, P&P, CG
32	6.31	Drawn, P&P, CG
36	7.99	Drawn, P&P, CG
40	9.86	Drawn, P&P, CG
45	12.48	Drawn, P&P, CG
50	15.41	Drawn, P&P, CG
55	18.65	Drawn, P&P, CG
60	22.19	Drawn, P&P, CG

Tolerances & Finish

Dimensional Tolerances, Straightness & Surface Finish

Typical Diameter Tolerances (ISO 286)

Diameter Range	h9 (mm)	h10 (mm)
22–30 mm	0 / −0.043	0 / −0.068
>30–50 mm	0 / −0.052	0 / −0.084
>50–60 mm	0 / −0.062	0 / −0.100

Notes: Ovality ≤ 50% of dia. tolerance (typ.); custom fits (h8, etc.) available subject to process route.

Finish & Straightness

Surface roughness (P&P/CG): Ra ~0.8–1.6 µm
Straightness: ≤ 1.0 mm per metre (typ.); closer on request
End condition: square cut

How We Manufacture Bright Bars

Raw material: Prime quality hot-rolled rounds/billets
Heat conditioning (if needed): normalize/stress relieve
Peeling/Turning or Cold Drawing: achieve base size
Straightening: multi-roll straightening for low bow
Polishing / Centreless Grinding: final size & finish
Deburring & Chamfering
Inspection: dimensions, surface, NDT as per order
Marking & Packing: tagged bundles, rust protection

Quality & Testing

Quality Assurance & Testing

MTC 3.1 as per EN 10204 with heat chemistry & mechanicals
NDT: Ultrasonic (UT) levels as ordered; MPI for surface
Hardness: Brinell/Rockwell checks per lot
Decarb: controlled via process route and verification (on request)
Traceability: heat & bundle number mapping till dispatch

Applications

Applications of EN8D Bright Round Bars

Shafts, spindles, axles
Studs, bolts, pins
Link rods, tie rods
General engineering components

Automotive sub-assemblies
Textile machinery parts
Fluid power & motion components
Fixtures & tooling

Ordering Guide

How to Order — Specification Checklist

Grade: EN8D (or equivalent requested)
Diameter: 22–60 mm (e.g., 32 mm)
Finish: Drawn / P&P / Centreless Ground
Tolerance: h9/ h10/h11 (or specific fit)
Length: R/L 3–6 m or cut length (e.g., 750 mm ±2 mm)
Testing: MTC 3.1; UT/MPI; hardness; other special tests
Quantity: MOQ 3000kg per size
Packing: strapped bundles; VCI wrap
Delivery: Ex Works or Free Delivery

FAQs (Human-visible, mirrors JSON-LD)

Frequently Asked Questions

A) Is EN8D equivalent to EN8 / 080M40 / C40?

They are all medium carbon steels in a similar range. In India, EN8D is used for bright bar applications with controlled chemistry. Always compare the heat’s MTC to your drawing requirements.

B) Can you supply centreless ground bars with tighter tolerances?

Yes. Centreless grinding enables closer fits (e.g., h8) and lower Ra. Share your fit and surface requirements.

C) What is the standard straightness for bright bars?

Typical is ≤ 1.0 mm per metre; tighter straightness may be offered based on size and process route.

D) Do you provide cut pieces with chamfered ends?

No.

E) What delivery options are available in India?

Regular dispatches across Maharashtra (Mumbai, Pune, Nashik, Aurangabad) and PAN-India through our logistics partners.

CTA

Request a Quote (₹) — EN8D Bright Rounds 22–60 mm

Send your enquiry with grade, size, tolerance, length, quantity, and tests required. We’ll reply with our best price .

Email RFQ Or call +91-9004064570

Disclosure

Notes: Data shown are indicative for general guidance. Confirm specific chemistry, mechanicals, tolerances, and NDT levels in our quotation and MTC. Product availability, lead times, and specs may vary by size and finish.

Ambhe Ferro En8d Steel

En8d Bright Bars