Premium Quality Stainless Steel Centreless Grinding Rods in Tolerances up to h6 – Supplied in Bright, Peeled, Polished & Cold Drawn Conditions.
Stainless Steel Centreless Grinding Rods are precision-engineered rods that undergo a specialized centerless grinding process to achieve superior surface finish, tight dimensional tolerance, and excellent roundness. These rods are manufactured from high-quality stainless steel grades such as 304, 316, 410, 420, 431, 303, and 17-4PH, which are known for their corrosion resistance, strength, and durability. The rods are widely used in industries requiring precision components, including automotive, aerospace, defense, medical, textile machinery, and general engineering. The grinding process removes imperfections and delivers a smooth, accurate, and highly polished surface that is essential for high-precision applications.
The manufacturing process begins with the selection of premium stainless steel billets, which are hot rolled or cold drawn into round bars and then ground using a centerless grinding technique. In this process, the rod is supported between a grinding wheel and a regulating wheel, allowing precise control over roundness and straightness without the use of a center point. This results in a uniform diameter across the entire length of the rod, with surface finishes often reaching Ra 0.2 µm or better. Depending on the grade and application, further treatments like heat treatment, annealing, or straightening may be performed to enhance the mechanical properties and dimensional accuracy.
Stainless Steel Centreless Grinding Rods are available in a wide range of diameters from 2mm to 100mm and lengths up to 6 meters or customized as required. They are manufactured in compliance with international standards such as ASTM A276, ASTM A484, ASTM A582, and AMS specifications. Tolerances can be as tight as h6, h7, or customized precision grades depending on the application. These rods offer excellent mechanical properties including high tensile strength, hardness, corrosion resistance, and fatigue resistance. The polished surface not only improves aesthetics but also enhances performance in applications requiring low friction and tight fits.
The key advantages of Stainless Steel Centreless Grinding Rods include exceptional roundness, improved straightness, tight tolerances, and excellent surface finish. These features make them ideal for high-precision components like shafts, spindles, pins, fasteners, pump parts, and surgical tools. The smooth finish reduces friction and wear in high-speed applications, while the corrosion-resistant properties of stainless steel ensure long-term durability in harsh environments. Easy machinability, consistent performance, and minimal maintenance make these rods a preferred choice for industries that demand accuracy, quality, and reliability in their production processes.
Buy Stainless Steel Centreless Ground Rods in Grades 304, 316L, 904L, 17-4 PH & More – Precision Sizes Ranging from 3mm to 600mm Diameter, Lengths Up to 12m.
Stainless Steel Centreless Grinding Rods Specifications
| Specification | Details |
|---|---|
| Product Name | Stainless Steel Centreless Grinding Rods |
| Grades Available | 304, 304L, 316, 316L, 310, 321, 410, 416, 420, 431, 440C, 15-5 PH, 17-4 PH, 17-7 PH, 13-8 MO |
| Diameter Range | 3mm to 100mm (custom sizes available) |
| Length | Standard: 1 to 6 meters | Custom Lengths: Up to 12 meters |
| Finish | Centreless Ground, Bright, Polished, Peeled, Smooth Surface |
| Tolerance | H9, H10, H11, or custom tolerances as per customer requirements |
| Standards | EN, DIN, JIS, ASTM, ASME, ISO |
| Applications | Automotive, Aerospace, Medical Devices, Precision Engineering, Shafts, Machining Components |
| Certification | ISO 9001:2015, PED, EN 10204 3.1 / 3.2, NACE MR0175 (on request) |
| Manufacturing Type | Hot Rolled, Cold Drawn, Peeled & Polished, Centreless Ground |
Types of Stainless Steel Centreless Grinding Rods
Hot Rolled Round Bars
Manufactured by hot rolling, offering excellent strength and durability.
Cold Drawn Round Bars
Precision-made with a smooth surface finish, ideal for machining.
Peeled & Polished Round Bars
Enhanced surface finish with high dimensional accuracy
Centerless Ground Round Bars
Extremely precise tolerance with a fine, smooth surface.
Forged Round Bars
High-strength bars for heavy-duty industrial applications.
Bright Round Bars
High-quality, smooth surface bars used in precision applications.
Black Round Bars
Raw, unfinished bars used in industrial applications requiring further processing.
Equivalent of Stainless Steel Centreless Grinding Rods
| Grade | JIS | BS | DIN | EN | UNS |
|---|---|---|---|---|---|
| 304 | SUS 304 | 304S31 | 1.4301 | EN 10088-2 | S30400 |
| 304L | SUS 304L | 304S11 | 1.4306 | EN 10088-2 | S30403 |
| 316 | SUS 316 | 316S31 | 1.4401 | EN 10088-2 | S31600 |
| 316L | SUS 316L | 316S11 | 1.4404 | EN 10088-2 | S31603 |
| 310 | SUS 310 | 310S51 | 1.4845 | EN 10088-2 | S31000 |
| 321 | SUS 321 | 321S51 | 1.4541 | EN 10088-2 | S32100 |
| 410 | SUS 410 | 410S21 | 1.4006 | EN 10088-2 | S41000 |
| 416 | SUS 416 | 416S21 | 1.4005 | EN 10088-2 | S41600 |
| 420 | SUS 420 | 420S29 | 1.4021 | EN 10088-2 | S42000 |
| 431 | SUS 431 | 431S29 | 1.4057 | EN 10088-2 | S43100 |
| 440C | SUS 440C | 440S40 | 1.4125 | EN 10088-2 | S44004 |
| 15-5 PH | Not applicable | Not applicable | 1.4545 | EN 10088-3 | S15500 |
| 17-4 PH | Not applicable | Not applicable | 1.4548 | EN 10088-3 | S17400 |
| 17-7 PH | Not applicable | Not applicable | 1.4568 | EN 10088-3 | S17700 |
| 13-8 MO | Not applicable | Not applicable | 1.4534 | EN 10088-3 | S13800 |
Chemical Composition of SS Centreless Grinding Rods
| Grade | C (Max) | Mn (Max) | Si (Max) | P (Max) | S (Max) | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–10.5 | — |
| 304L | 0.03 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–12.0 | — |
| 316 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 316L | 0.03 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 321 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 9.0–12.0 | — |
| 410 | 0.15 | 1.00 | 1.00 | 0.040 | 0.030 | 11.5–13.5 | — | — |
| 420 | 0.15 | 1.00 | 1.00 | 0.040 | 0.030 | 12.0–14.0 | — | — |
| 431 | 0.20 | 1.00 | 1.00 | 0.040 | 0.030 | 15.0–17.0 | 1.25–2.50 | — |
| 17-4 PH | 0.07 | 1.00 | 1.00 | 0.040 | 0.030 | 15.0–17.5 | 3.0–5.0 | — |
| 15-5 PH | 0.07 | 1.00 | 1.00 | 0.040 | 0.030 | 14.0–15.5 | 3.5–5.5 | — |
Mechanical Properties of SS Centreless Grinding Rods
| 304 | 515–750 | 205 | 40 | ≤ 201 |
| 304L | 485–700 | 170 | 40 | ≤ 187 |
| 316 | 515–760 | 205 | 40 | ≤ 217 |
| 316L | 485–700 | 170 | 40 | ≤ 217 |
| 321 | 515–750 | 205 | 40 | ≤ 217 |
| 410 | 450–650 | 275 | 20 | ≤ 223 |
| 420 | 700–850 | 345 | 20 | ≥ 223 |
| 431 | 850–1000 | 620 | 15 | 250–300 |
| 17-4 PH | 930–1310 | 725 | 16 | ≤ 363 |
| 15-5 PH | 930–1310 | 860 | 15 | ≤ 363 |
Dimension Table of SS Centreless Grinding Rods
| Diameter (mm) | Diameter (inch) | Length (m) | Length (ft) | Tolerance |
|---|---|---|---|---|
| 6 | 0.24″ | 1 to 6 | 3.3 to 19.7 | h8 / h9 / h10 |
| 10 | 0.39″ | 1 to 6 | 3.3 to 19.7 | h8 / h9 / h10 |
| 20 | 0.79″ | 2 to 12 | 6.6 to 39.4 | h8 / h9 / h10 |
| 25 | 0.98″ | 2 to 12 | 6.6 to 39.4 | h8 / h9 / h10 |
| 40 | 1.57″ | 2 to 12 | 6.6 to 39.4 | h8 / h9 |
| 60 | 2.36″ | 2 to 12 | 6.6 to 39.4 | h9 |
| 75 | 2.95″ | 2 to 12 | 6.6 to 39.4 | h9 |
| 100 | 3.94″ | 2 to 12 | 6.6 to 39.4 | h9 |
| 150 | 5.91″ | 2 to 12 | 6.6 to 39.4 | h9 |
| 200 | 7.87″ | 2 to 6 | 6.6 to 19.7 | h11 |
Diameter Tolerances for Stainless Steel Centreless Grinding Rods
| Nominal Diameter Range (mm) | h6 Tolerance (mm) | h7 Tolerance (mm) | h8 Tolerance (mm) | h9 Tolerance (mm) | h10 Tolerance (mm) |
|---|---|---|---|---|---|
| 3 – 6 | -0.006 / 0 | -0.010 / 0 | -0.014 / 0 | -0.025 / 0 | -0.040 / 0 |
| 6 – 10 | -0.008 / 0 | -0.012 / 0 | -0.018 / 0 | -0.030 / 0 | -0.048 / 0 |
| 10 – 18 | -0.009 / 0 | -0.015 / 0 | -0.022 / 0 | -0.036 / 0 | -0.058 / 0 |
| 18 – 30 | -0.011 / 0 | -0.018 / 0 | -0.027 / 0 | -0.043 / 0 | -0.070 / 0 |
| 30 – 50 | -0.013 / 0 | -0.021 / 0 | -0.033 / 0 | -0.052 / 0 | -0.084 / 0 |
| 50 – 80 | -0.016 / 0 | -0.025 / 0 | -0.039 / 0 | -0.062 / 0 | -0.100 / 0 |
| 80 – 120 | -0.019 / 0 | -0.030 / 0 | -0.046 / 0 | -0.074 / 0 | -0.120 / 0 |
| 120 – 180 | -0.022 / 0 | -0.035 / 0 | -0.054 / 0 | -0.087 / 0 | -0.140 / 0 |
| 180 – 250 | -0.025 / 0 | -0.040 / 0 | -0.063 / 0 | -0.100 / 0 | -0.160 / 0 |
Worldwide Supply of SS Centreless Grinding Rods
Russia, Bahrain, Cyprus, Egypt, Iran, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Palestine, Qatar, Saudi Arabia, Syria, Turkey, United Arab Emirates (UAE), Yemen, United States of America (USA), Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom, Vatican City.
