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BRIGHT BAR

BRIGHT BAR

Bright round steel bars for use in precision machining

What are bright round steel bars?
Bright round steel bars are made of carbon and alloy steel that has been precisely finished so that it can be used for high-precision machining in manufacturing. These bars have a smooth, polished surface finish that is achieved through cold drawing or centreless grinding. They have very tight dimensional tolerances, usually between ±0.025mm and ±0.075mm, and they meet Indian IS 9550 and international standards.

We are leading manufacturers of Bright Round and Bright Hexagon Bars.

These bars come in various sizes and grades and conform to various national and international standards as per the requirements of the customers.

We make our own hot-rolled bars for making bright steel. Depending on customers’ requirements, we also purchase steel bars from reputable manufacturers.

Various industries such as machined components, hydraulic fittings, pump shafts, fasteners, auto parts, construction, capital goods, valves, machine tools, dairy equipment, studs, bolts, pins, etc. use our bars.

Steel Bright Rods are steel bars manufactured by passing hot-rolled steel bars through dies in a cold process.

THE ADVANTAGES OF STEEL BRIGHT BARS ARE:

  • Cold drawing of steel improves Size and Section which provides Tighter tolerances which Reduces machining losses.
  • Improved Steel Surface Finish which Reduces surface machining & improves quality.
  • Improved Straightness which Facilitates automatic bar feeding in CNC.
  • It increases Mechanical Properties which Can reduce the need for hardening.
  • It improves Machinability and Productivity which Enables higher machining feeds, high tool life, yield & speeds and improved machined finish.

SIZES WE MAKE IN ARE:

  • Bright Rounds: 22mm to 63.5mm
  • Bright Hexagon Bars – 22mm to 50mm

We can manufacture any size within our size range provided the requirement is regular.

Grades we manufacture regularly in Bright Steel are : Mild Steel, AISI 1018 steel, En8d steel, S45C,  S48C, En1a steel, En1a(Pb), En8m, 1035, 35C8,  steel, 16MnCr5 steel, 20MnCr5 steel, SAE 4140, En19 steel, etc.

We are a supplier to several companies and vendors in Mumbai, Pune (eg Chakan, Bhosari, Ranjangaon, etc), Aurangabad, Nashik, Ahmednagar, Rajkot, Thane, Nagpur, Belgaum, Kolhapur, etc.

These bars undergo various types of forming operations, such as machining, forging, punching, slotting, cutting, drilling, knurling, etc.

Why and Who Uses Bright Round Steel Bars?

Principal Users:

A) VMC facilities and CNC machine shops that don’t require a lot of material removal
B) Auto parts manufacturers in Chennai, Delhi NCR, Pune, Nasik, Aurangabad, and other clusters.
C) Businesses that produce machinery and parts for OEMs

Information

bright bar

Frequently Asked Questions About Bright Steel Bars

Basics & Definitions

What is the main difference between Bright Bar and Black Bar?
The main difference is the surface finish and tolerance. Black bars are hot-rolled and have a rough, scaly surface with wider size tolerances. Bright bars are cold-finished (drawn, peeled, or ground) to create a shiny, smooth surface with precise dimensions (h9/h10/h11 tolerances), making them ready for immediate use in precision engineering.
What does "Cold Drawn" mean in steel processing?
Cold drawing is a process where a steel bar is pulled through a tungsten carbide die at room temperature. This reduces the bar's diameter to a specific size, improves the surface finish, and aligns the grain structure, which significantly increases the steel's tensile and yield strength.
Why are they called "Bright" bars?
They are called "Bright" bars because the cold finishing process removes the dark, oxidized scale found on hot-rolled steel, leaving the metal with a shiny, bright, and metallic appearance.
What are the standard tolerance limits for bright bars?
Bright bars are typically manufactured to ISO tolerance standards. Common classes are h9, h10, and h11 for cold drawn bars, and h8 or h9 for centerless ground bars. For example, a 25mm h9 bar has a tolerance of +0.00mm / -0.052mm.

Manufacturing & Technical Specs

What is the difference between Peeling and Cold Drawing?
Cold drawing sizes the bar by pulling it through a die. Peeling is a machining process where the outer layer of the bar is cut away to remove surface defects. Peeling does not increase the hardness of the core material as much as cold drawing does.
What is Centerless Grinding and when is it used?
Centerless grinding is a premium finishing process used to achieve extremely tight tolerances (like h7 or h8) and a mirror-like finish (Ra value). It is typically used for pump shafts, hydraulic piston rods, and linear motion bearings where precision is critical.
Does cold drawing affect the magnetic properties of steel?
Cold drawing does not fundamentally change the magnetic nature of ferromagnetic steels (like carbon steel), but the stress introduced during the process can slightly alter magnetic permeability. However, for most general engineering applications, the magnetic properties remain effective.
Does the cold finishing process increase steel hardness?
Yes. Cold working (drawing) induces "work hardening," which increases the surface hardness, yield strength, and tensile strength of the material compared to its hot-rolled state.
What is stress relieving in bright bars?
Stress relieving is a heat treatment process performed after cold drawing. It helps to remove internal residual stresses caused by the drawing process, ensuring the bar does not warp or distort during subsequent machining operations.

Steel Grades & Materials

What is En1a or 12L14 steel used for?
En1a (equivalent to AISI 12L14) is a "Free Cutting Steel." It contains Sulphur and Lead, which act as internal lubricants. This allows for extremely high machining speeds, making it the standard choice for manufacturing nuts, bolts, and small turned parts in high volumes.
Can you weld Bright Steel Bars?
It depends on the grade. Mild steel grades like AISI 1018 or En3B are easily weldable. However, Free Cutting steels (like En1a) containing Sulphur or Lead are generally **not recommended for welding** as they can cause porosity and cracking.
What is the difference between En8 and En9 bright bars?
Both are medium carbon steels. En8 (AISI 1040/1045) has roughly 0.40% carbon and is used for axles and shafts. En9 (AISI 1055) has higher carbon (0.55%), making it harder and more wear-resistant, suitable for cams and gears, but it is more brittle than En8.
What is En19 or 4140 steel typically used for?
En19 (AISI 4140) is a high-tensile alloy steel containing Chromium and Molybdenum. It offers high fatigue strength and impact resistance, making it ideal for heavy-duty automotive parts like crankshafts, connecting rods, and axle shafts.
What does "Leaded" steel mean?
Leaded steel creates small lead particles within the steel matrix. During machining, these particles melt and lubricate the cutting tool, allowing for faster production speeds and longer tool life. It is common in En1a (Leaded) grade.

Applications & Logistics

Why are bright bars preferred for CNC machining?
CNC machines use automatic bar feeders that require materials to be perfectly straight and have a consistent diameter to prevent jamming. The precise tolerances and straightness of bright bars make them the only viable option for high-speed CNC production.
Do bright bars rust?
Yes, because the protective oxide scale is removed during cold finishing, bright bars are more susceptible to rust if left unprotected. They are usually coated with a rust-preventive oil before shipping and should be stored in a dry environment.
What are the standard lengths of bright bars?
The international standard length is usually 3 to 6 meters (10 to 20 feet). However, bars can be cut to specific lengths based on customer requirements for shipping or specific machining setups.
Can bright bars be used for construction?
While they can be used for decorative architectural elements (like railings and gates) due to their finish, they are typically too expensive for general structural concrete reinforcement compared to standard TMT rebars.
What shapes are available in bright bars?
The most common shapes are Round, Hexagon (for nuts/bolts), Square (for keys), and Flat bars. Special profiles can also be cold drawn customized to specific engineering drawings.
How are bright bars packed for transport?
To protect the delicate surface, bright bars are usually bundled, wrapped in HDPE or Hessian cloth, and strapped with steel bands. For export or high-precision ground bars, they may be packed in wooden boxes to prevent bending or scratching.

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