Home > Bright Bars > Centerless Ground Bright Bars
Centerless Ground Bright Bars Manufacturer, Supplier & Exporter – Inox Steel India
Inox Steel India is a trusted manufacturer, supplier, and exporter of Centerless Ground Bright Bars, delivering ultra-precision bars for applications where diameter accuracy, roundness, straightness, and surface finish are absolutely critical. Our centerless ground bright bars are widely used in hydraulics, CNC machining, automotive, oil & gas, bearing, and aerospace industries across India and global export markets.
Centerless grinding is the most advanced finishing process for bright bars, producing extremely tight tolerances and superior surface quality without inducing bending or stress. At Inox Steel India, we use high-precision grinding machines to ensure consistent diameter, low ovality, and uniform finish across the entire bar length.
What Are Centerless Ground Bright Bars & How Are They Manufactured?
Centerless Ground Bright Bars are precision bars produced by grinding the outer diameter of straightened bars between a grinding wheel and a regulating wheel, without the use of centers. This allows for exceptional dimensional control and surface finish, especially for long bars.
Manufacturing Process Flow:
1️⃣ Hot Rolled or Cold Drawn Bar Selection
2️⃣ Precision Straightening
3️⃣ Centerless Grinding (OD Control)
4️⃣ Polishing / Surface Refinement
5️⃣ Length Cutting & End Finishing
6️⃣ Final Inspection & Measurement
This process results in bright bars with very low diameter variation, excellent straightness, and mirror-grade surface finish, making them ideal for high-precision engineering applications.
Key Advantages of Centerless Ground Bright Bars
✔ Ultra-tight dimensional tolerances (h6 / h7 / h8)
✔ Excellent roundness with minimal ovality
✔ Superior surface finish (Ra ≤ 0.4 – 0.8 µm)
✔ Outstanding straightness over full bar length
✔ Reduced or zero secondary machining
✔ Ideal for high-speed CNC & hydraulic applications
Materials & Grades Available
Centerless Ground Bright Bars from Inox Steel India are available in a wide range of materials, including:
All materials are supplied with EN 10204 3.1 / 3.2 Mill Test Certificates, ensuring full traceability and quality assurance.
Applications of Centerless Ground Bright Bars
Centerless Ground Bright Bars supplied by Inox Steel India are used in applications where micron-level diameter accuracy, perfect roundness, and superior surface finish are mandatory. These bars are ideal for components that operate under high speed, pressure, or continuous motion, where even minor dimensional variation can cause failure.
Typical Applications Include:
CENTERLESS GROUND BRIGHT BARS
| Parameter / Property | Centerless Ground Bright Bars |
|---|---|
| Product Type | Centerless Ground Bright Bars |
| Manufacturing Process | Hot Rolled / Cold Drawn Bar → Straightening → Centerless Grinding → Polishing → Cutting |
| Available Materials | Carbon Steel · Alloy Steel · Stainless Steel · Duplex · Tool Steel · Nickel Alloy · Copper · Brass · Titanium |
| Common Grades | EN8, EN9, C45 · EN19, EN24, 4140 · SS 304/316/303/410 · Duplex 2205 · D2/H13 · Inconel 625 · Monel 400 · Cu/CuZn · Ti Gr 2/5 |
| Applicable Standards | ASTM · EN · DIN · IS · ASME |
| Forms Available | Round Bright Bars (Primary) |
| Diameter Range (Round) | 5 mm – 150 mm |
| Standard Length | 3 – 6 meters |
| Custom Cut Lengths | As per drawing / CNC requirement |
| Dimensional Tolerances | h6 / h7 / h8 |
| Straightness | ≤ 0.5 / 1000 of length |
| Roundness / Ovality | Excellent (Very Low Ovality) |
| Surface Finish (Ra) | ≤ 0.4 – 0.8 µm |
| Surface Quality | Free from Scale, Scratches, Laps, Chatter Marks |
| Mechanical Properties | Uniform Along Full Bar Length |
| Machinability | Excellent (Minimum Finishing Required) |
| Heat Treatment Condition | As Drawn / Annealed / Q&T (Material Dependent) |
| Testing Performed | Chemical · Mechanical · Dimensional · Surface Finish |
| Certification | EN 10204 3.1 / 3.2 |
| HSN / HS Code | 7228 / 7222 / 7505 / 7407 / 8108 (Material Dependent) |
| Typical Applications | Hydraulic Rods, Precision Shafts, Bearing Components |
| Industries Served | CNC Machining · Hydraulics · Automotive · Oil & Gas · Aerospace |
| Packaging | HDPE Wrap · Wooden Pallets · Export Seaworthy |
Size Range & Dimensional Capabilities
Inox Steel India supplies centerless ground bright bars with exceptional dimensional control, reducing or eliminating secondary machining.
These specifications ensure perfect fitment, low vibration, and extended component life.
Surface Finish & Performance Benefits
Centerless ground bright bars offer the highest level of precision among bright bar finishes:
Because of these advantages, centerless ground bars are widely used in hydraulic, bearing, and aerospace components.
Indicative Centerless Ground Bright Bar Price (INR & USD)
| Material Type | Approx. Price (INR / kg – Ex-Mumbai) | Approx. Price (USD / kg – FOB India) |
|---|---|---|
| Carbon Steel | ₹ 120 – ₹ 170 | $ 1.45 – $ 2.05 |
| Alloy Steel | ₹ 160 – ₹ 260 | $ 1.95 – $ 3.15 |
| Stainless Steel | ₹ 320 – ₹ 480 | $ 3.85 – $ 5.75 |
| Duplex / Super Duplex | ₹ 550 – ₹ 1,100 | $ 6.65 – $ 13.20 |
Prices vary based on grade, diameter, tolerance class (h6/h7), and surface finish requirement.
HSN / HS Code
Testing & Quality Assurance
Every centerless ground bright bar supplied by Inox Steel India undergoes rigorous inspection:
All supplies are accompanied by EN 10204 3.1 / 3.2 Mill Test Certificates.
Why Choose Inox Steel India for Centerless Ground Bright Bars
Inox Steel India is a dependable manufacturer, supplier, and exporter of Centerless Ground Bright Bars, delivering micron-level precision, superior surface finish, and consistent dimensional accuracy for the most demanding engineering applications. Our centerless ground bars are trusted where roundness, straightness, and tolerance control directly impact performance and service life.
Our Core Strengths:
✅ Manufacturer & bulk stockholder
✅ Ultra-precision tolerances: h6 / h7 / h8
✅ Superior surface finish: Ra ≤ 0.4 – 0.8 µm
✅ Excellent straightness & minimal ovality
✅ Wide material range: Carbon, Alloy, Stainless, Duplex, Tool Steel, Nickel, Copper, Titanium
✅ Custom cut lengths for CNC, hydraulic & bearing applications
✅ EN 10204 3.1 / 3.2 certification
✅ Competitive domestic & export pricing
✅ Export-grade packaging & documentation
Industries & Applications We Serve
| Industry | Typical Components |
|---|---|
| Hydraulics & Pneumatics | Piston rods, cylinder shafts, plungers |
| Machining & CNC | Precision shafts, guide rods |
| Automotive | Transmission & steering shafts |
| Bearing & Motion Systems | Rollers, linear shafts |
| Oil & Gas / Power | Actuator rods, pump shafts |
| Aerospace | High-precision rotating components |
Centerless ground bright bars are selected where zero deviation, smooth motion, and long fatigue life are essential.
Common tolerances include h6, h7, and h8, depending on application requirements. They are used in hydraulics, bearings, CNC machining, automotive, oil & gas, and aerospace applications. Centerless ground bars offer tighter diameter control and better roundness than polished bars. Yes, we supply custom cut lengths as per drawing or CNC program. HSN codes depend on material and include 7228, 7222, 7505, 7407, and 8108. What tolerances are available in centerless ground bars?
Where are centerless ground bright bars used?
How is centerless ground bar different from polished bar?
Do you supply custom cut lengths?
What is the HSN code for centerless ground bright bars?